Key information

Title: Apparatus and method for treatment of wet organic matter to produce biogas
Application number: 20170077
Case type: National
Status: 18.03.2019 Patent meddelt (B1)
Filed: 18.01.2017
Effective date: 18.01.2017
Publicly available: 19.07.2018
Next annual fee due: 31.01.2027
Applicant: Waterment AS (NO) et al.
Owner: Waterment AS (NO) et al.
Inventor: Dag Normann Øvrebø (NO) et al.
Agent: ACAPO ONSAGERS AS (NO)
Granted: 18.03.2019
Patent number: 343456
Expiry date: 18.01.2037

Abstract and drawing

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.

The invention concerns an apparatus for treatment of wet organic matter to produce biogas, comprising a closed reactor (11) for anaerobic digestion of the wet organic matter. The anaerobic reactor has the form of two vertical tubes, a vertically arranged outer tube (14) defining a first reactor chamber (111) enveloping a vertically arranged inner tube (15) which is divided into a first region (112a) and a second region (112b) of a second reactor chamber (112) by a vertical partitioning wall (16). The partitioning wall leaves a free area between the first region (112a) and the second region (112b) near the bottom of the inner tube (15) to allow material transportation therethrough. The upper end of the first region (112a) of the second reactor chamber exhibits an opening to first reactor chamber (111) for allowing material transportation from the first reactor chamber (111) to the first region (112a) of the second reactor chamber (112). The first reactor chamber (111) is connected to an inlet conduit (12) at its lower end while the second reactor chamber (112b) is connected to a discharge conduit (17) for fluid material. The anaerobic reactor (11) further exhibits a top discharge pipe (18) for gas developed in either of the two reactor chambers (111, 112). A method for treatment of wet organic matter is also contemplated.

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Date	Doc. No.	Process	Case number	In/Out	Journal description	To/from
22.03.2019	14-01	Saksbehandling	20170077	UT	PT Registreringsbrev Nasjonal Patent (15) (PT20170077)
08.01.2019	13-01	Saksbehandling	20170077	UT	Intention to grant	CURO AS
04.12.2018	12-01	Saksbehandling	20170077	UT	PT Varsel om betaling av første årsavgift (3317) (PT20170077)
06.11.2018	02-01	Endring av søker/innehaver	2018/14620	UT	GH Forespørsel	CURO AS
01.11.2018	11-06	Saksbehandling	20170077	INN	Beskrivelse merket	CURO AS
01.11.2018	11-05	Saksbehandling	20170077	INN	Beskrivelse	CURO AS
01.11.2018	11-04	Saksbehandling	20170077	INN	Krav	CURO AS
01.11.2018	11-03	Saksbehandling	20170077	INN	Hovedbrev	CURO AS
01.11.2018	11-02	Saksbehandling	20170077	INN	Univ SØ-Norge Enhetsregisteret	CURO AS
01.11.2018	11-01	Saksbehandling	20170077	INN	Korrespondanse (Hovedbrev inn)	CURO AS
01.11.2018	01-02	Endring av søker/innehaver	2018/14620	INN	Annet dokument	CURO AS
01.11.2018	01-01	Endring av søker/innehaver	2018/14620	INN	Generell henvendelse	CURO AS
22.08.2018	10-01	Saksbehandling	20170077	UT	Realitet patent	CURO AS
06.08.2018	09-03	Saksbehandling	20170077	INN	Hovedbrev	CURO AS
06.08.2018	09-02	Saksbehandling	20170077	INN	Overdragelsesdokument	CURO AS
06.08.2018	09-01	Saksbehandling	20170077	INN	Korrespondanse (Hovedbrev inn)	CURO AS
15.05.2018	08-04	Saksbehandling	20170077	INN	Hovedbrev	CURO AS
15.05.2018	08-03	Saksbehandling	20170077	INN	Krav merket	CURO AS
15.05.2018	08-02	Saksbehandling	20170077	INN	Krav ren	CURO AS
15.05.2018	08-01	Saksbehandling	20170077	INN	Korrespondanse (Hovedbrev inn)	CURO AS
27.02.2018	07-01	Saksbehandling	20170077	UT	Realitet patent	CURO AS
21.11.2017	06-04	Saksbehandling	20170077	INN	Hovedbrev	Curo AS
21.11.2017	06-03	Saksbehandling	20170077	INN	Krav, merket	Curo AS
21.11.2017	06-02	Saksbehandling	20170077	INN	Krav, ren	Curo AS
21.11.2017	06-01	Saksbehandling	20170077	INN	Korrespondanse (Hovedbrev inn)	Curo AS
20.07.2017	05-02	Saksbehandling	20170077	UT	PT report 02:57:18
20.07.2017	05-01	Saksbehandling	20170077	UT	Realitet patent	Curo AS
22.03.2017	04-03	Saksbehandling	20170077	INN	Fullmakt	Curo AS
22.03.2017	04-02	Saksbehandling	20170077	INN	Overdragelsesdokument	Curo AS
22.03.2017	04-01	Saksbehandling	20170077	INN	Korrespondanse (Hovedbrev inn)	Curo AS
20.01.2017	03-01	Saksbehandling	20170077	UT	Formalia 1	Curo AS
20.01.2017	02-01	Saksbehandling	20170077	UT	Infobrev til oppfinner	Curo AS
18.01.2017	01-03	Saksbehandling	20170077	INN	Beskrivelse	Curo AS
18.01.2017	01-02	Saksbehandling	20170077	INN	Tegninger	Curo AS
18.01.2017	01-01	Saksbehandling	20170077	INN	Søknadsskjema Patent	Curo AS

Description, claims and drawings

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.

Description

Field of the invention

The present relates to the design of a process to recover resources from wet organic wastes, such as energy, nutrients and organics from manure, sludge, slurries and wastewater. More precisely the present invention relates to an apparatus for treatment of wet organic matter to produce biogas according to the preamble of claim 1 and method for treatment of wet organic matter comprising a mixture of fluid and solid particulates according to the preamble of claim 13.

Background

Wet organic wastes (WOW) are to an increasing extent used as source for biogas production by anaerobic digestion (AD) through processes that also yield other products such as nutrient that can be used as fertilizer. The bioreactor technology available for AD often represents a capital cost that is not covered by the value of the products produced, making the implementation of such solutions dependent on idealism and/or government subsidies. More efficient bio processes are therefore required to make AD processes more sustainable and industrially feasible. Additional downstream treatment is often needed to comply with discharge limits and improve the quality of produced gas, organics and fertilizers. The cost of such treatment can be quite high. There is thus a need for an advanced bioprocess to improve production efficiency and product quality, to cut investment and operational costs.

A number of methods and systems/ apparatuses have been proposed in this technical field. Anaerobic sludge blanket reactors (UASB) have been used for high rate anaerobic digestion processes but are not suitable for particle rich fluids such as slurries, cf.

Tchobanoglous, G., Burton, F. L., & Stensel, H. (2003). Wastewater Engineering: Treatment and reuse, Advanced Wastewater Treatment, 4th Edition. McGraw-Hill Series in Civil and Environmental Engineering. Metcalf and Eddy Inc. New York.

An anaerobic baffle reactor (ABR) is described in US patent No.5091 315 (McCarty, 1989). McCarty teaches a bioconversion reactor for anaerobic fermentation of organic material comprising a shell enclosing a defined volume, an inlet port through which a liquid stream of organic material can enter the reactor as well as an outlet port through which the material may leave the reactor. A series of vertical and spaced-apart baffle plates are arranged in the reactor forcing the stream to pass under and over the plates respectively.

The anaerobic baffle reactors (ABR) were originally designed to take advantage of the UASB principles while being able to handle feeds with high particulates contents but it has not been very successful since it is not as efficient as intended.

DE 3604 415 A1 (Caro) describes a cylindrical reactor vessel for biogas production which is subdivided by further concentrically arranged cylinders into a plurality of stages, which, depending on the direction of flow, have overruns at the top end or overflow ducts at the bottom end. When biogas is produced from highly organically polluted waste waters, e.g., three stages are situated in the reactor through which flow passes successively. In the inner stage hydrolysis takes place, in the middle stage acid formation takes place and in the outer stage methane formation takes place. The untreated water is continuously introduced into the inner stage from below by a feed pipe (11).

CA 2723 334 A1 (Gantefort et al.) relates to a fermenter for generating biogas from pumpable organic material with a low content of organic dry matter, comprising at least one inlet for the pumpable organic material, at least one fixed bed reactor for the pumpable organic material with at least one primary and one secondary section and at least one outlet for the remaining fermentation residue. The fermenter can optionally comprise at least one sedimentation chamber for the pumpable organic material, arranged between the primary and secondary sections and at least one recycling section connected to the sedimentation chamber and designed such that specific lighter fractions of the pumpable organic material can be recovered and reintroduced to the rising (primary) section of the fixed bed reactor or a preceding or subsequent conventional fermenter.

GB 2167 055 A (Norrman et al.) teaches a process which is conducted in three steps, viz.

1) anaerobic degradation in a lagoon of high molecular complex organic material in the wastewater stepwise to low molecular soluble organic compounds, further to acetate, H2, CO2 and finally to biogas (methane carbon dioxide) by a consortium of microorganisms including methanogens, 2) further conversion of low molecular compounds to biogas in an upflow or downflow anaerobic filter containing dense populations of microorganisms, mainly methanogens, and 3) final aerobic biological treatment (polishing) of the wastewater in an aerobic treatment unit.

US 2005/109694 A1 (Huey-Song et al.) describes a system for treating wastewater containing organic compounds. The system comprises an anaerobic bioreactor, an aerobic bioreactor disposed rearwardly of the anaerobic bioreactor, and a membrane separation reactor disposed rearwardly of the aerobic bioreactor. The system is capable of removing organic pollutants in wastewater through biological treatment process and separating solid from the liquid ones by using a membrane.

Other methods and devices in this technical field are described in CN 106242162 A (2016); WO 16059621 A (Alessandro, 2016); WO 16050893 A1 (Uller, 2016); WO 15037989 A1 (Koorneef, 2015); RU 2536988 C (Burdin et al., 2013); WO 13112182 A1 (Smith, 2013).

Still, the general challenge of providing cost-effective and space-effective methods and apparatuses in this technical field remains.

Objective

It is an objective of the present invention to provide a method and an apparatus to treat organic sludge from industry and agriculture, wastewater and other types of wet organic wastes, more efficiently than available solutions through a novel bioreactor process design, producing methane at a moderate cost.

It is a further object of the invention to provide an apparatus suited for conducting such a method, with low mechanical complexity and construction cost.

Finally, it is an objective to provide the above mentioned method and apparatus to convert organic wastes into valuable, non-toxic products that require little and inexpensive post-treatment.

The present invention

The above objects are fulfilled with the apparatus and method according to the present invention.

According to a first aspect, the invention relates to an apparatus as defined by claim 1. According to a second aspect the invention concerns a method as defined by claim 13. The dependent claims disclose preferred embodiments of the invention.

The apparatus of the invention comprises an anaerobic reactor comprising two reactor chambers where an inner reactor chamber is enveloped within an outer reactor chamber. In a general perspective this is a known concept. Between the two reactor chambers a particle retaining unit is arranged as further detailed below. This design is unique and inventive, due to the inherent advantages.

In a preferred embodiment the apparatus of the present invention also includes a second reactor arranged downstream of the anaerobic reactor, said second reactor being arranged as an aerobic reactor.

In the following description, if not otherwise specifically is stated, the term “methane” is meant to cover pure methane as well as biogas in which methane is the main constituent.

“Pipe” as used herein, refers to a tubular section or hollow cylinder, typically but not necessarily of circular cross-section. In particular the inner tubes of the reactors may have polygonal cross-sections, such as a square cross-section. Independent thereof, the innermost tube of the aerobic reactor, if present, may also have a cross-section selected among polygonal cross-sections, circular cross-section, and oval cross-sections.

Further and preferred details of the apparatus and method are provided in the detailed description below with reference to the enclosed drawings.

Figure 1a is a schematic and simplified side transparent perspectival view of a preferred embodiment of the apparatus of the invention.

Figure 1b is a schematic and simplified top sectional view of the apparatus of Figure 1a. Figure 1c is a schematic and simplified side transparent perspectival view of a preferred embodiment of the apparatus of the invention, which is slightly different from the embodiment of Figure 1a

Figure 2a is a schematic and simplified side transparent perspectival view of a preferred embodiment of the apparatus according to the present invention.

Figure 2b is a schematic and simplified top sectional view of the apparatus of Figure 2a. Figure 2c is an enlarged sectional side view of a detail 31 from Figures 2a and 2b.

Figure 2d is a perspectival view of elements shown in Figure 2c.

Figure 2e is an enlarged sectional side view of a detail 131 slightly different from detail 31 shown in Figure 2c.

Figure 2f is a perspectival view of elements shown in Figure 2e.

Figures 2g-2i are top sectional views of different embodiments of details 31, 131 in Figures Figure 3 is a principle view of a preferred embodiment of the process according to the present invention.

Figure 4 is a schematic and simplified side transparent perspectival view of an embodiment of the optional aerobic reactor.

Figure 5 shows graphs of chemical oxygen demand (COD) and NH4 respectively at inlet and outlet during a practical example.

It should be noted that the dimensions may be distorted on the drawings; e.g. the ratio between diameter and height for the various equipment shown.

Since the present invention is related to a method as well as an apparatus, parts of the drawings are referred to with slightly different terminology depending on whether the apparatus or the method is discussed. Thus, one and the same figure detail may be referred to as “reactor chamber” when discussing apparatus and as “reaction zone” when discussing method; as “conduit” when discussing apparatus and as “process flow” when discussing method.

Figure 1a is a schematic view of a general apparatus within this technical field, showing a reactor 11 comprising a closed outer cylinder 14 and an inner cylinder 15 completely enveloped by the outer cylinder. By “closed” is understood that the cylinder has a fluid tight bottom and a fluid tight top, with exception of the shown inlet and outlet conduits.

Fresh material to be treated is to be charged to the first and outer reactor chamber 111 via inlet conduit 12, the outer reactor chamber being defined between the inner wall of the outer cylinder and the outer wall of the inner cylinder.

The inner cylinder has a top end a vertical distance below the top of the outer cylinder and a bottom end a vertical distance above the bottom of the outer cylinder. The inner cylinder shown in Figure 1a has a wall section 15a, the top of which is lower than the top of the inner cylinder, thereby allowing material flow from the outer cylinder over the top of said low wall 15a into a first region 112a of the inner cylinder adjacent to said low wall section 15a. Said region 112a of the inner cylinder is partly separated from the other region 112b of the inner cylinder by a vertical plate or partition wall 16 which extends downwards from the top of the inner cylinder 15 and which is terminated a distance above the closed bottom wall of the inner cylinder.

It is imperative for the economy of the process as well as for the operational conditions that the discharge flow from the reactor 11 is a flow of substantially particle free fluid and that the particles are retained until converted to gas through the action of microorganisms.

While the plate or partition wall 16 extends from the top of the inner cylinder 15, it is typically not attached to the top in a fluid tight manner. More preferably a space is left open along the top of the partition wall 16 or through perforations in the uppermost section of it to allow produced gas to pass through to reach a common gas discharge conduit 18.

The arrangement described above allows transportation flow of material from the bottom to the top of the outer cylinder 14, downwards in the region 112a of the inner cylinder and upwards again in the region 112b of the inner cylinder. It is desired, however, that the material leaving the reactor 11 through the conduit 17 arranged near the top of region 112b of the inner cylinder, is solely fluid material and that all particles of the material remain in the apparatus until converted to gas from the action of microorganisms, anaerobic bacteria or archaea.

Methane containing biogas developed by the action of the microorganisms, is arranged to leave the reactor through a conduit 18 arranged at the top of the reactor 11. Since methane is developed in the inner cylinder as well as in the outer cylinder, the top of the inner cylinder may be open to allow flow of methane containing biogas to the conduit 18 or provided with a separate gas discharge conduit (not illustrated).

It is difficult to retain all the particulate material in the apparatus, therefore a particle retaining unit as discussed below is incorporated at least between the first and second chamber of the anaerobic reactor 11.

Figure 1b is a top sectional view of the reactor 11 shown in Figure 1, illustrating the outer cylinder 14, the inner cylinder 15, the first reactor chamber 111 defined by the inner wall of the outer cylinder and the outer wall of the inner cylinder, the first region 112a of the second reactor chamber and the second region 112b of the second reactor chamber, said regions being separated by a vertical partition wall 16 extending from the top of the inner cylinder down to a bottom edge located above the bottom wall of the inner cylinder.

Figure 1c shows an anaerobic reactor principally similar to the one discussed in relation to figure 1a above. The sole difference between these embodiments is that the open passage from the first, outer reactor chamber into the first section 112a of the inner reactor chamber has the form of a slot opening 15c in the vertical wall rather than a completely open section adjacent to a lower wall section 15a in such a way that fluid flowing from compartment 111 to 112a is discharged from compartment 111 below the upper fluid surface of compartment 111. The feed conduit 12, the discharge conduit 17 and the internal flow between these are all as described above. Still, this embodiment is not sufficient to retain the particulate material in the apparatus under all operating conditions and for all materials.

According to the present invention, cf. Figure 2a, a separator or particle retaining unit 31 is arranged near the top of the outer cylinder 14, constituting a particle trap passage through which the fluid has to flow before entering region 112a of the inner cylinder. In a similar manner a separator 32 is optionally arranged near the top of the inner cylinder 15, between the second reactor chamber 112 and the discharge conduit 17, through which separator fluid has to flow before leaving the reactor 11. These separators 31, 32 have the function of retaining as much as possible of the solid, particulate material in each of the cylinders until being converted to gas by the action of the microorganisms.

Figure 2b is a top sectional view of the embodiment shown in Fig.2a.

Now referring to Figure 2c, such particle retaining units (e.g.31) may be supplied with arrangements at the lower surfaces that gather small rising gas bubbles into larger bubbles as they flow along the lower surfaces towards the highest point of these lower surfaces. This can be achieved by having a downward pointing rim on these surfaces to channel the bubbles to the highest points of each surface, where there is an opening to direct where the bubbles are released for further vertical flow towards the upper fluid surface. In Figure 2c, inclined regions 33 and 34 are arranged to direct vertically rising bubbles carrying small solid particles away from the entrance of the separator 31 so as to prevent the particles to escape the reaction chamber with the fluid. At least one mainly vertically arranged pipe 35 may be used to convey such accumulated bubbles and particles to the top of the reaction chamber in question or they may flow freely upwards outside the separator 31. To enter the separator 31 through the slot shaped entrance 37, the fluid has to move in a mainly horizontal direction, while the lighter gas bubbles tends to rise vertically past the entrance.

Inside the particle retaining unit 31 may be provided with vertically extending partition walls 36 to ensure a mainly laminar upwards flow of fluid in the unit.

Figure 2d provides a perspectival view of part of the particle retaining unit 31 shown in Figure 2c, in a direction slightly upwards. The inclined regions or elements 33 and 34 are shown with a downwards extending rim, contributing to direct the gas bubbles upwards to ports in the rim arranged at their highest points. A port in the rim surrounding inclined region 34 is so positioned that most of the bubbles escaping the region will enter the optional pipe 35. The slot shaped entrance 37 for liquid to the particle retaining unit is just barely visible on the drawing due to the partly overlap horizontally of the inclined regions 33 and 34.

Figure 2e shows an embodiment of a particle retaining unit 131 slightly different from the embodiment 31 of Figure 2c, the main difference being that the outer cylindrical wall of the unit 131 is extended to at least partly cover the inclined regions 133, 134 and that the opening for the gas bubbles at the upper end of inclined region 134 has the form of a hole in the cylindrical wall rather than a recess in a rim.

The embodiment of Figure 2e is shown from a different angle in Figure 2f, the hole in the cylindrical wall and the pipe 135 facing the viewer. Dotted lines in Figure 2f illustrate the path for bubbles moving upwards along the inclined region 134 (dotted lines) hidden by the outer cylindrical wall of the particle retaining unit (below the entrance opening for the liquid), passing through the hole in the wall to the outside and from there passing into the lower entrance of the pipe 135, still rising upwards.

Figure 2g is a top sectional view of the interior of particle retaining unit 131, showing a number of parallel partition walls 136 making the fluid entering to flow mainly laminary therethrough. Figure 2h shows a top sectional view of the interior of particle retaining unit 231, showing a number of partition walls 236 arranged diametrically, still making the fluid entering to flow mainly laminary therethrough. Figure 2i shows a top sectional view of the interior of particle retaining unit 331, showing a number of partition walls 336 having the form of a stack of pipes having a diameter significantly smaller than that of the particle retaining unit 331. Also In this case the fluid entering the particle retaining unit is made to flow mainly laminary therethrough.

The purpose of gathering small bubbles into large ones before they rise to the reactor liquid surfaces in such a way that they locally impose strong mixing is to break up floating sludge at the upper fluid surface to enhance release of gas within this floating sludge and allow such sludge to settle faster to lower sections of the reactor chambers. These larger bubbles may flow freely along the sides of the particle retaining units (31, 32) or in a pipe ending close to the fluid surface.

Such particle retaining units 31, 32 may also be supplied with inside arrangements consisting of parallel plates or tubes parallel to the said units side walls to dampen flow disturbances and obtain laminar flow conditions to enhance sedimentation of particles.

The reactor chamber 111 may be provided with any suitable temperature controlling device in order to monitor and control the temperature therein.

Each particle retaining unit may be a technically simple device, such as a mainly cylindrical body provided with inclined plates extending into the area through which the material tends to move, to retard the upwards motion thereof and preferably to impose one or more directional change of motion and also to lengthen the travel distance from the inlet conduit to the outlet conduit for one or both of the reaction chambers 111, 112. The shape of the separator should be such that particles floating upwards due to entrapped gas bubbles will be diverted by the inclined plates to not enter the separator but rather float to the top, from where it will settle back down by gravity when entrapped gas has been released. More complex separators may include plural plates or the like to impose several directional changes for the fluid on its way to the discharge.

Reference is now made to Figure 3 which is more oriented to method than to apparatus design. According to the method constituting the second aspect of the present invention, a second reactor 21 is arranged downstream of the first anaerobic reactor 11. The second reactor is arranged as an aerobic reactor of three reaction zones 211, 212, 213 and has at least a function in purifying the discharge water from the first reactor. It may also have the function of supporting and improving the digestion conditions in the first reactor, by means of a recycle of fluid from the second reactor to the first reactor. The second reactor is designed to allow air or oxygen or oxygen enriched air be brought into intimate contact with the fluid for a period of time sufficient for oxygen to be absorbed by the water so that microorganisms in the reactor can take up sufficient oxygen to cause bio-chemical reaction between oxygen and components in the fluid, such as in particular methane and organic components.

The first reactor chamber 211 of the second reactor is arranged to receive as feed the material discharged trough discharge conduit 17 of the first reactor, the second reactor chamber 212 is arranged for addition of oxygen though an inlet conduit 29, and a recycle conduit 28 for recycling fluid with particulate material from the aerobic reactor 21 to the anaerobic reactor 11, while the third reactor chamber 213 of the second reactor exhibits an upper discharge conduit 26 for purified fluid and a lower discharge conduit 27 for mostly particulate matter.

In a preferred embodiment the aerobic reactor 21, the third reactor chamber 213 may be replaced by a particle retaining unit arranged between the reactor chambers 211 or 212 the discharge conduit 26.

The recycle conduit 28 is typically provided with means to control the flow rate therethrough independently of other flow rates through the reactor chambers.

Reference is now made to Figure 4. The second reactor may, similar to the first reactor, be designed as tubes in tube. More specifically, the first reactor chamber 211 of the second reactor 21 may be defined within an inner, open vertical tube 22 while the third reactor chamber 213 may be defined between an outer, closed vertical tube 23 and such inner vertical tube 22.

Specifically, the second reactor 21 may be comprised by three reactor chambers 211, 212, 213 separated by vertical walls having the shape of an open innermost tube 24 arranged within a wider inner tube 22, both of which being arranged within a still wider closed vertical tube 23, the upper wall edge of the innermost tube 24 being terminated below the fluid discharge conduit 26 that determines the fluid level in the closed vertical tube 23. The lower wall of the innermost tube 24 is terminated above the bottom of the outer, closed vertical tube 23 while the upper wall edge of the wider inner tube (22) is terminated above the fluid discharge conduit 26 that determines the fluid level in the closed vertical tube 23. The lower wall of the wider inner tube 22 is terminated above the bottom of the outer, closed vertical tube 23, thus defining an annulus 211 between the inside wall of tube 22 and the outside wall of tube 24 and defining an annulus 213 between the inside wall of tube 23 and the outside wall of tube 22.

Figure 3 is a schematic view of the process according to the method constituting the second aspect of the present invention. It should be noted that Figure 3 does not intend to illustrate any specific design of the reactors or reactor chambers involved, only the methodology. Thus, the process taking place in the left hand part of Fig.3 may very well be conducted in a reactor of the type illustrated in the previously discussed drawings.

To the left the feed fluid flows through a reactor in which an anaerobic digestion process takes place. Organic material/ sludge to be treated is supplied through conduit 12 at the bottom of a first reactor chamber 111. Microorganisms, mainly anaerobic bacteria and archaea are present in a sludge bed in reactor 11 to facilitate conversion to methane in a manner known per se. The fluid part of the feed passes over the partition wall 15, through a separator designated a particle retaining unit. The partition wall 15 may be the wall of an inner cylinder enveloped by an outer cylinder as earlier described.

From here the fluid flows downwards and into a reaction zone or chamber 112a, under the partition wall and upwards in reactor chamber 112b. The fluid then flows through a discharge conduit 17, optionally after having passed through a separator (not shown), from the first reactor 11 connected to an inlet conduit 25 into the second reactor 21 near the top of 21. The second reactor is arranged as an aerobic reactor and comprises three reactor chambers or reaction zones 211, 212, 213, which are at least partially separated from one another as explained below. In a first reaction zone 211 of the aerobic reactor 21, the flow direction is downwards. In the second reaction zone 212 the flow direction is upwards, facilitated by addition of air, oxygen enriched air or pure oxygen gas through an inlet conduit 29. There will be interaction by continuous circulation between the zones 211 and 212 which are only partly separated by a partition wall 24 having open passages below its lower side edge and above its upper side edge. The aeration in zone 212 supplies the oxygen required i.a. for microorganisms to carry out bio-chemical reaction between oxygen and components such as methane and organic components in the fluid. Particles may be collected at the bottom of zone 211 and recycled to the anaerobic reactor 11 along with some amounts of fluid, e.g. through recycle conduit 28, to improve anaerobic performance by increased biogas production and improved biogas quality.

Treated fluid leaves the zone 212 to zone 213 under the partition wall 22 partly separating zone 212 from 213. Zone 213 serves as a sedimentation zone to retain particles. Particles can be harvested at the bottom of zone 213 and discharged through outlet conduit 27.

Main features and advantages

The new invention combines the best aspects of UASB and ABR, simplifying the ABR design so as to make its construction much cheaper and to enable more efficient retention of particles, comparable that of standard ABR designs.

Furthermore, the aspect of an integrated anaerobic and aerobic process enhances the transformation of organic matter to methane beyond what is obtainable by an anaerobic process alone. The aerobic processes in reactor 21 capture and convert remaining dissolved organic matter and dissolved inorganic matter in the anaerobic effluent to biomass through growth of aerobic microorganisms through biochemical reactions using oxygen as electron acceptor. Part of the fluid in the aerobic reactor is pumped back to the anaerobic reactor in a controlled manner to supply aerobic biomass as extra feed for methane production in the anaerobic reactor.

Such aerobic biomass can have an additional benefit on the anaerobic process since it can contain more and different enzymes than the purely anaerobic culture, thereby enhancing hydrolysis of particles in the feed, also leading to more and faster biogas production.

The oxygen containing bubbles introduced in chamber 212 induce upwards fluid flow in 212 which will again induce a downward fluid flow in 211 where the effluent from the anaerobic reactor is introduced, allowing dissolved gasses in the introduced fluid to be absorbed in the aerobic reactor fluid while the fluid is flowing downwards, allowing time for methane to be taken up by the organisms, thereby preventing methane from being stripped off as a greenhouse gas downstream of the anaerobic reactor.

Dissolved methane in the fluid is consumed and used as feed for growth by aerobic microorganisms so that there is no dissolved methane in the fluid when it enters 212 at the bottom, thereby avoiding stripping off of methane to the atmosphere with the air bubbles that are introduced in chamber 212.

Dissolved CO2 in the fluid introduced in 211 has no role as feed for aerobic biomass growth and will not be taken up, so it will be stripped off to the atmosphere when the fluid enters 212 with the air bubbles that are introduced there. The fluid recycled from 21 to 11 is thereby low in CO2, so that the methane to CO2 ratio of the biogas recovered from the anaerobic reactor is higher than what will be achieved in 11 without such process interaction with 21. Combining 11 and 21 thereby serves as a principle for internal biogas upgrading since methane is the desired product.

Particles that are heavier than water are separated by gravity from the water that flows upwards in 213 towards the effluent conduit 26 and are thereby retained in the process to maintain a high concentration of micro-organisms to carry out the required processes and to make nutrient rich agglomerates that can be harvested as products and to avoid particles in the treated water.

The separator or particle retaining unit can serve the same purpose as third reaction zone or chamber 213 as an alternative to retain agglomerated particles in reactor 21. Surplus agglomerates can be harvested from reactor 11 and/or 21, to obtain different quality agglomerates.

While the process conducted by means of the aerobic reactor is shown generally as material moving from left to right, a convenient design of the reactor may also in this case have the form of vertical cylinders enveloping one another, in this case cylinder within cylinder within cylinder, as principally illustrated by figure 4 and commented above.

The microbiological cultures used according to the present invention are typically present as suspended microbiological cultures, or as attached microbiological cultures or as a combination thereof.

The anaerobic process may be conducted as up-flow anaerobic sludge beds, implying that the culture is retained by gravity when the fluid leaves the chambers.

The anaerobic process of the present invention may generally be conducted in any number of up-flow anaerobic sludge beds wherein a particle retaining unit is arranged between each up-flow anaerobic sludge bed chamber and the discharge of said chamber.

Example

A pilot plant constructed according to Figure 2 have been tested for several months using particle rich “Black wateri” from vacuum toilets as feed. The first graph of Figure 5 shows the development of organic matter removal, as chemical oxygen demand (COD) in and out of the reactor, measured according to standard procedures and equipment supplied by Hach, Manchester, GB. Measurements were taken regularly from start-up 15.July2015 until 13.october2015 and show that more than half of the feed COD was removed when the process reach steady state conditions towards the end of the test period. Ammonium is released when organic matter that contains proteins is broken down, as can be seen in the second graph where the measured outlet ammonium level is several times higher than inlet concentrations at steady state, confirming efficient degradation of organic matter in the reactor design. Several other measurements, such as pH, organic acids, biogas production and biogas composition also confirm that the process functions as intended.

Claims

1. Apparatus for treatment of wet organic matter to produce biogas, comprising a closed reactor (11) for anaerobic digestion of the wet organic matter, wherein said anaerobic reactor has the form of two vertical tubes, a vertically arranged outer tube (14) defining a first reactor chamber (111) enveloping a vertically arranged inner tube (15) which is divided into a first region (112a) and a second region (112b) of a second reactor chamber (112) by a vertical partitioning wall (16) leaving a free area between the first region (112a) and the second region (112b) near the bottom of the inner tube (15) to allow material transportation therethrough, the upper end of the first region (112a) of the second reactor chamber exhibiting an opening to first reactor chamber (111) for allowing material transportation from the first reactor chamber (111) to the first region (112a) of the second reactor chamber (112), said first reactor chamber (111) being connected to an inlet conduit (12) at its lower end while the second reactor chamber (112b) at its upper end is connected to a discharge conduit (17) for fluid material, the anaerobic reactor (11) further exhibiting a top discharge pipe (18) for gas developed in either of the two reactor chambers (111, 112), characterized in that a particle retaining unit (31) is arranged between the first reaction chamber (111) and the first region (112a) of the second reactor chamber (112).

2. Apparatus as claimed in claim 1, wherein the opening between the first section of the second reactor chamber (112) and the first reactor chamber (111) has the form of a slot shaped opening (15c) in the wall section of the inner tube at the first region (112a) thereof.

3. Apparatus as claimed in any one of the preceding claims, wherein a particle retaining unit (32) is arranged between the second reactor chamber (112) and the discharge conduit (17).

4. Apparatus as claimed in claims 1, or 3, wherein the particle retaining units (31, 32) are supplied with arrangements at the lower surfaces that gather small rising gas bubbles into larger bubbles and channel these to rise to the reactor liquid surfaces in such a way that they locally impose strong mixing to break up floating sludge to enhance release of gas within this floating sludge.

5. Apparatus as claimed in claims 4, wherein the larger bubbles flow from where they were gathered in a pipe ending at or close to the fluid surface.

6. Apparatus as claimed in claims 1, or 3, wherein the particle retaining units (31, 32) are supplied with inside arrangements consisting of parallel plates or tubes parallel to the said units side walls to dampen flow disturbances and obtain 5 laminar flow conditions to enhance sedimentation of particles.

7. Apparatus as claimed in any one of the preceding claims, wherein the first reactor chamber (111) is provided with a temperature-controlling device.

8. Apparatus as claimed in any one of the preceding claims, wherein the apparatus furthermore comprises a second closed aerobic reactor (21) arranged downstream of said anaerobic reactor (11) with a fluid inlet conduit (25) connected to the fluid discharge conduit (17) from the first reactor (11), said aerobic reactor (21) comprising at least two reactor chambers (211, 212), the first reactor chamber (211) of the second reactor being arranged to receive as feed the material discharged trough discharge conduit (17) of the first reactor, the second reactor chamber (212) being arranged for addition of oxygen though an inlet conduit (29), and a recycle conduit (28) for recycling fluid with particulate material from the aerobic reactor (21) to the anaerobic reactor (11), while a third reactor chamber (213) of the second reactor exhibits an upper discharge conduit (26) for purified fluid and a lower discharge conduit (27) for mostly particulate matter.

9. Apparatus as claimed in claim 8, wherein the third reactor chamber (213) of the second reactor is replaced by a particle retaining unit arranged between the reactor chamber (211 or 212) and the discharge conduit (26).

10. Apparatus as claimed in claim 8 or 9, wherein the recycle conduit (28) for recycling particulate matter and fluid from the aerobic reactor (21) to the anaerobic reactor (11) is arranged for adjustable flow amounts.

11. Apparatus as claimed in any one of claims 8 and 10, wherein the first reactor chamber (211) of the second reactor (21) is defined within an inner, open vertical tube (22) and the third reactor chamber (213) is defined between an outer, closed vertical tube (23) and said inner vertical tube (22).

12. Apparatus as claimed in any one of claims 8, 10, 11, wherein the second reactor (21) is comprised by three reactor chambers (211, 212, 213) separated by vertical walls having the shape of an open innermost tube (24) arranged within a wider inner tube (22), both of which being arranged within a wider closed vertical tube (23), the upper wall edge of the innermost tube (24) being terminated below the fluid 5 discharge conduit (26) that determines the fluid level in the closed vertical tube (23), the lower wall of the innermost tube (24) being terminated above the bottom of the outer, closed vertical tube (23), the upper wall edge of the wider inner tube (22) being terminated above the fluid discharge conduit (26) that determines the fluid level in the closed vertical tube (23), the lower wall of the wider inner tube (22) being terminated above the bottom of the outer, closed vertical tube (23), defining an annulus (211) between the inside wall of tube (22) and the outside wall of tube (24) and defining an annulus (213) between the inside wall of tube (23) and the outside wall of tube (22).

13. Method for treatment of wet organic matter comprising a mixture of fluid and solid particulate matter to clean the fluid, to produce methane comprising anaerobic digestion (11) in at least two reaction zones facilitated by microbiological cultures, followed by aerobic treatment (21) in three reaction zones (211, 212, 213) in which air or oxygen enriched air or pure oxygen is bubbled through the fluid effluent from the anaerobic process, producing at least a top product flow (18) of mostly methane from the anaerobic treatment, a bottom flow of mostly organic and nutrient rich particulate matter (27) and a discharge flow of mostly water (26), characterized in retaining particles in at least the first anaerobic reaction zone.

14. Method as claimed in claim 13 wherein applying a significant degree of recycling between the first reaction zone (211) and the second reaction zone (212), the air or oxygen enriched air or pure oxygen being supplied to the second reaction zone (212).

15. Method as claimed in claim 13 or 14 wherein a controlled part of the fluid under treatment in the aerobic process is recycled back to the anaerobic process to enhance the methane production therein.

16. Method as claimed in any one of claims 13-15, wherein the microbiological cultures are present as suspended microbiological cultures, or as attached microbiological cultures or as a combination thereof.

17. Method as claimed in any one of claims 13-16, wherein the anaerobic process is conducted as up-flow anaerobic sludge beds, implying that the culture is retained by gravity when the fluid leaves the chambers.

18. Method as claimed in in any one of claims 14-17, wherein air or oxygen enriched air or pure oxygen bubbles are introduced in the aerobic process to 5 supply oxygen and to induce upwards fluid flow in one reaction zone (212) thereby inducing a downward fluid flow in an adjacent reaction zone (211) where the effluent from the anaerobic process is introduced, allowing dissolved gasses in the introduced fluid to be absorbed by the fluid in the aerobic process while the fluids are flowing downwards.

19. Method as claimed in any one of claims 14-18, wherein dissolved methane in the fluid in reaction zone (211) is consumed and used as feed for growth by aerobic microorganisms so that there is no dissolved methane in the fluid when it enters reaction zone (212), thereby avoiding stripping off of methane to the atmosphere with the air bubbles that are introduced in reaction zone (212).

20. Method as claimed in in any one of claims 14-19, wherein dissolved CO2 in the fluid introduced in reaction zone (211) is stripped off to the atmosphere when the fluid enters reaction zone (212) with the air bubbles that are introduced in reaction zone (212) so that the fluid recycled (28) from the aerobic process (21) to the anaerobic process (11) is low in CO2, thereby facilitating a high methane to CO2 ratio of the biogas produced in the anaerobic process.

21. Method as claimed in any one of claims 13-20, wherein the fluid leaving the process as treated water has to flow upwards in the third reaction zone (213) allowing particles that are heavier than water to be separated by gravity from the water and thereby be retained in the process to maintain a high concentration of micro-organisms to carry out the required processes and to make nutrient rich agglomerates that can be harvested as products and to maintain high level of organic nutrient rich agglomerates in recycle conduit (28) and to avoid particles in the treated water.

22. Method as claimed in any of claims 13-21 wherein the anaerobic process is conducted in any number of up-flow anaerobic sludge beds wherein a particle retaining unit is arranged between each up-flow anaerobic sludge bed chamber and the discharge of said chamber.

Patentkrav

1. Apparat for behandling av våtorganisk material for å produsere biogass, omfattende en lukket reaktor (11) for anaerob nedbrytning av våtorganisk material, idet nevnte anaerobe reaktor har form av to vertikale rør, et vertikalt anordnet ytre rør (14) som avgrenser et første reaktorkammer (111) og so omgir et vertikalt anordnet indre rør (15) som er delt inn i en første region (112a) og en andre region (112b) av andre reaktorkammer (112) med en vertikal skillevegg (16) som etterlater et fritt område mellom første region (112a) og andre region (112b) nær bunnen av det indre rør (15) for å tillate materialtransport derigjennom, idet øvre ende av første region (112a) av andre reaktorkammer oppviser en åpning inn til første reaktorkammer (111) for å tillate materialtransport fra første reaktorkammer (111) til første region (112a) av andre reaktorkammer (112), idet første reaktorkammer (111) er koblet til en innløpsrør (12) ved dets nedre ende mens andre reaktorkammer (112b) ved dets øvre ende er koblet til et utløpsrør (17) for flytende material, idet den anaerobe reaktor (11) videre oppviser et øvre utløpsrør (18) for gass som dannes i ethvert av de to reaktorkamre (111, 112), karakterisert ved at en enhet (31) for å holde tilbake partikler er anordnet mellom første reaktorkammer (111) og første region (112a) av andre reaktorkammer (112).

2. Apparat i samsvar med patentkrav 1, idet åpningen mellom første region av andre reaktorkammer (112) og første reaktorkammer (111) har form av en slisseformet åpning (15c) i veggseksjonen av det indre rør, ved dets første region (112a).

3. Apparat i samsvar med et hvilket som helst av de foregående patentkrav, idet en enhet (32) for å holde tilbake partikler er anordnet mellom andre reaktorkammer (112) og utløpsrøret (17).

4. Apparat i samsvar med patentkrav 1 eller 3, idet enhetene (31, 32) for å holde tilbake partikler er utstyrt med innretninger ved de nedre flater som samler små, stigende gassbobler til større bobler og kanaliserer disse til å stige til reaktorens væskeflater på en slik måte at de lokalt bevirker kraftig blanding som bryter opp flytende slam for å øke frigivelse av gass inne i det flytende slam.

5. Apparat i samsvar med patentkrav 4, idet de store bobler strømmer fra hvor de ble samlet, inn i et rør som ender ved eller nær overflaten.

6. Apparat i samsvar med patentkrav 1 eller 3, idet enhetene (31, 32) for å holde tilbake partikler er utstyrt med innvendige anordninger som består av parallelle plater eller rør som er parallelle med nevnte enheters sidevegger for å dempe strømningsforstyrrelser og danne laminære strømningsbetingelser for å forbedre sedimentering av partikler.

7. Apparat i samsvar med et hvilket som helst av de foregående patentkrav, idet det første reaktorkammer (111) er utstyrt med en temperaturregulerende innretning.

8. Apparat i samsvar med et hvilket som helst av de foregående patentkrav, idet apparatet videre omfatter en andre lukket aerob reaktor (21) anordnet nedstrøms av nevnte anaerobe reaktor (11) med et fluid innløpsrør (25) koblet til fluid utløpsrør (17) fra den første reaktor (11), idet den aerobe reaktor (21) omfatter minst to reaktorkamre (211, 212), idet først reaktorkammer (211) av den andre reaktor er anordnet til å motta som føde materialet som føres ut gjennom utløpsrør (17) fra første reaktor og idet andre reaktorkammer (212) er anordnet for tilførsel av oksygen gjennom et innløpsrør (29) og en resirkuleringsrør (28) for å resirkulere fluid med partikulært material fra den aerobe reaktor (21) til den anaerobe reaktor (11), mens et tredje reaktorkammer (213) av andre reaktor oppviser et øvre utløpsrør (26) for renset fluid og et nedre utløpsrør (27) i hovedsak for partikkelmaterial.

9. Apparat i samsvar med patentkrav 8, idet det tredje reaktorkammer (213) av andre reaktor er erstattet av en enhet for å holde tilbake partikler, anordnet mellom reaktorkammer (211 eller 212) og utløpsrøret (26).

10. Apparat i samsvar med patentkrav 8 eller 9, idet resirkuleringsrøret (28) for å resirkulere partikulært material og fluid fra den aerobe reaktor (21) til den anaerobe reaktor (11) er anordnet for regulerbare strømningsmengder.

11. Apparat i samsvar med et hvilket som helst av patentkravene 8 og 10, idet det første reaktorkammer (211) av andre reaktor (21) er avgrenset av et indre, åpent vertikalt rør (22) og det tredje reaktorkammer (213) er avgrenset av et ytre, lukket, vertikalt rør (23) og nevnte indre vertikale rør (22).

12. Apparat I samsvar med et hvilket som helst av patentkravene 8, 10, 11, idet den andre reaktor (21) består av tre reaktorkamre (211, 212, 213) separert av vertikale vegger med form av et åpent innerste rør (24) anordnet innenfor et bredere indre rør (22), idet begge disse er anordnet innenfor et bredere, lukket, vertikalt rør (23), idet øvre veggkant av innerste rør (24) er avsluttet lavere enn fluid utløpsrør (26) som bestemmer væskenivået i det lukkede, vertikale rør (23), idet nedre vegg av det innerste rør (24) er avsluttet over bunnen av det ytre, lukkede vertikale rør (23), idet øvre veggkant av det bredere rør (22) er avsluttet over fluidutløpsrør (26) som bestemmer væskenivået i det lukkede vertikale rør (23), idet nedre vegg av det bredere indre rør (22) er avsluttet over bunnen av det ytre, lukkede vertikale rør (23), avgrensende et ringrom (211) mellom innsideveggen av rør (22) og utsideveggen av rør (24) og avgrensende et ringrom (213) mellom innsideveggen av rør (23) og utsideveggen av rør (22).

13. Fremgangsmåte ved behandling av våtorganisk material omfattende en blanding av væske og fast, partikulært material for å rense væsken og fremstille metan, omfattende anaerob nedbrytning (11) i minst to reaksjonssoner støttet av mikrobielle kulturer, fulgt av aerob behandling (21) i tre reaksjonssoner (211, 212, 213) i hvilken luft eller oksygenanriket luft eller ren oksygen blir boblet gjennom væskeeffluenten fra den anaerobe metode under dannelse av i det minste en topproduktstrøm (18) av hovedsakelig metan fra den anaerobe prosess, en bunnstrøm av hovedsakelig organisk og næringsrikt partikulært material (27) og en reststrøm i hovedsak av vann (26), karakterisert ved å holde tilbake partikler i minst en første anaerob reaksjonssone.

14. Fremgangsmåte i samsvar med patentkrav 13, idet det benyttes en betydelig grad av resirkulering mellom første reaksjonssone (211) og den andre reaksjonssone (212), idet luft eller oksygenanriket luft eller ren oksygen blir tilført til den andre reaksjonssone (212)

15. Fremgangsmåte i samsvar med patentkrav 13 eller 14, idet en regulert mengde av væsken under behandling i den aerobe prosess blir resirkulert tilbake til den anaerobe prosess for å forbedre metanproduksjonen i denne.

16. Fremgangsmåte i samsvar med et hvilket som helst av patentkravene 13-15, idet de mikrobiologiske kulturer er til stede som suspenderte, mikrobiologiske kulturer eller som fastsittende mikrobiologiske kulturer eller som en kombinasjon av de nevnte.

17. Fremgangsmåte i samsvar med et hvilket som helst av patentkravene 13-16, idet den anaerobe prosess blir utført som oppstrøms anaerobe slamtepper, hvilket innebærer at kulturen holdes tilbake bed gravitasjon når væsken forlater kamrene.

18. Fremgangsmåte i samsvar med et hvilket som helst av patentkravene 14-17, idet luft eller oksygenanriket luft eller rene oksygenbobler blir innført i den aerobe prosess for å tilføre oksygen og for å indusere en oppover rettet væskestrøm én reaksjonssone (212) og derved indusere en nedover rettet væskestrøm i en tilgrensende reaksjonssone (211) idet effluenten fra den anaerobe prosess blir innført, hvilket tillater oppløste gasser i den innførte væske å bli absorbert av væskene i den aerobe prosess når væskene strømmer nedover.

19. Fremgangsmåte i samsvar med et hvilket som helst av patentkravene 14-18, idet oppløst metan i fluidet i reaksjonssone (211) blir konsumert og benyttet som føde for vekst av aerobe mikroorganismer slik at det ikke er noe oppløst metan i fluidet som kommer inn i reaksjonssone (212), og man derved unngår å strippe av metan til atmosfæren med luftboblene som innføres i reaksjonssone (212.

20. Fremgangsmåte i samsvar med et hvilket som helst av patentkravene 14-19, idet oppløst CO2 i fluidet som innføres i reaksjonssone (211) blir strippet av til atmosfæren når fluidet kommer inn i reaksjonssone (212) med luftbobler som innføres i reaksjonssone (212), slik at fluidet som resirkuleres fra den aerobe prosess (21) til den anaerobe prosess (11) har lavt CO2 innhold, og man derved støtter et høyt metan til CO2 forhold i biogassen som produseres i den anaerobe prosess.

21. Fremgangsmåte i samsvar med et hvilket som helst av patentkravene 13-20, idet fluidet som forlater prosessen som behandlet vann, må strømme oppover i den tredje reaksjonssone (213) hvilket tillater partikler som er tyngre enn vann å bli separert ut av vannet gjennom gravitasjon og derved bli holdt tilbake i prosessen for å opprettholde en høy konsentrasjon av mikroorganismer for å utføre den aktuelle prosess og for å danne næringsrike agglomerater som kan bli høstet som produkter samt for å opprettholde høyt nivå av organiske, næringsrike agglomerater i resirkuleringsrør (28) og for å unngå partikler i det behandlede vannet.

22. Fremgangsmåte i samsvar med et hvilket som helst av patentkravene 13-21, idet den anaerobe prosess blir utført i et hvilket som helst antall av oppover strømmende slamtepper hvor en enhet for å holde tilbake partikler er anordnet mellom hvert oppover-strømmende slamteppe-kammer og utløpet fra nevnte kammer.

Drawings

Priority

No priority

Patent classes

IPC classes

C12M 1/00

C12M 1/107

C02F 3/00

C02F 3/02

C02F 3/10

C02F 3/12

C02F 3/28

C02F 1/00

C02F 11/04

C02F 11/02

C12M 1/24

CPC classes

Y02W 10/00

Y02W 10/10

Y02W 10/12

Y02W 10/15

Y02W 10/20

Y02W 10/23

Y02W 10/27

C12M 23/00

C12M 23/58

C12M 21/04

C02F 3/00

C02F 3/02

C02F 3/10

C02F 3/12

C02F 3/1221

C02F 3/28

C02F 3/2806

C02F 2003/008

C02F 2003/001

C02F 1/00

C02F 11/04

C02F 11/02

C12M 1/24

Citations

DE 3604415 A1 (A1)

CA 2723334 A1 (A1)

GB 2167055 A (A)

US 2005109694 A1 (A1)

Applicants, owners and inventors

Owners

Waterment AS

Vipeveien 51

3917 PORSGRUNN

NO (PORSGRUNN Municipality, Telemark county)

Org. number: 985309434

Universitetet i Sørøst-Norge

Postboks 235

3603 KONGSBERG

NO (KONGSBERG Municipality, Buskerud county)

Org. number: 911770709

Inventors

Dag Normann Øvrebø

Rostockgata 7

0191 OSLO

NO (OSLO Municipality, Oslo county)

Rune Bakke

Arne Garborgs gate 13

3718 SKIEN

NO (SKIEN Municipality, Telemark county)

Agent

ACAPO ONSAGERS AS

Edvard Griegs vei 1

5059 BERGEN

NO (BERGEN Municipality, Vestland county)

Org. number: 932214636

Reference: U3621

Status history

Payment history

Oppositions and appeals

No oppositions or appeals

Administrative limitation

No administrative limitation

Liens and licences

No liens or licenses registered

Gazette entries

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Only events from 2024.03.04 and onwards are shown.

Apparatus and method for treatment of wet organic matter to produce biogas