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Title: US5500123: Two-phase anaerobic digestion of carbonaceous organic materials
[ Derwent Title ]


Country: US United States of America

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6 pages

 
Inventor: Srivastava, Vipul J.; Woodridge, IL

Assignee: Institute of Gas Technology, DesPlaines, IL
other patents from INSTITUTE OF GAS TECHNOLOGY (275350) (approx. 321)
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Published / Filed: 1996-03-19 / 1994-11-08

Application Number: US1994000336332

IPC Code: Advanced: C02F 3/28;
IPC-7: C02F 3/28;

ECLA Code: C02F3/28S; C02F3/28; C12M21/04; C12M23/36; C12M29/18; C12M45/04; C12M47/18;

U.S. Class: Current: 210/603; 210/613; 210/622; 210/630;
Original: 210/603; 210/613; 210/622; 210/630;

Field of Search: 210/603,605,607,609,613,620,622,630,631,912

Priority Number:
1994-11-08  US1994000336332
1993-12-28  US1993000174958

Abstract:     A process for improved methane production by two-phase anaerobic digestion of organic carbonaceous material in which organic carbonaceous material is fermented under anaerobic conditions in an acid phase digester, forming a liquid/solids effluent, the liquid/solids effluent is fermented under anaerobic conditions in a methane phase digester, product gas comprising methane is withdrawn from the methane phase digester, and oxygen is introduced into the methane phase digester. In a preferred embodiment, the methane phase liquid effluent is passed through a CO2 stripper resulting in stripping of CO2 and H2S from the methane phase liquid effluent. The resulting stripper liquid effluent comprising dissolved oxygen is then recycled back to the methane phase digester.

Attorney, Agent or Firm: Speckman, Pauley & Fejer ;

Primary / Asst. Examiners: Wyse, Thomas;

Maintenance Status: E3 Expired  Check current status

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1993000174958 1993-12-28       


       
Parent Case:     This application is a continuation of application No. 08/174,958, filed Dec. 28, 1993, abandoned.

Designated Country: AM AP AT BB BG BR BY CA CH CN CZ DE DK EP ES FI GB GE HU JP KE KG KP KR KZ LK LT LU LV MD MG MN MW NL NO NZ OA PL PT 

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First Claim:
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I claim:     1. A process for improved methane production by two-phase anaerobic digestion of organic carbonaceous material comprising the steps of:
  • introducing said organic carbonaceous material into an acid phase digester;
  • fermenting said organic carbonaceous material in said acid phase digester under anaerobic conditions, forming a liquid/solids effluent;
  • passing said liquid/solids effluent to a methane phase digester;
  • fermenting said liquid/solids effluent in said methane phase digester under anaerobic conditions and withdrawing gas comprising methane from said methane phase digester;
  • passing a methane phase liquid effluent to a CO2 stripper and stripping CO2 and H2 S from said methane phase liquid effluent; and
  • introducing a stripper liquid effluent comprising dissolved oxygen into said methane phase digester.


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Forward References: Show 35 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (35)   |   Backward references (13)   |   Citation Link

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PDF
Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 6pp US4022665  1977-05 Ghosh et al.  Institute of Gas Technology Two phase anaerobic digestion
Get PDF - 6pp US4318993  1982-03 Ghosh et al.  Institute of Gas Technology Two phase anaerobic digester system
Get PDF - 8pp US4323367  1982-04 Ghosh  Institute of Gas Technology Gas production by accelerated in situ bioleaching of landfills
Get PDF - 6pp US4358537  1982-11 Chynoweth  Institute of Gas Technology In situ biological beneficiation of peat in the production of hydrocarbon fuels
Get PDF - 7pp US4366059  1982-12 Witt  Celanese Corporation Anaerobic treatment
Get PDF - 8pp US4396402  1983-08 Ghosh  Institute of Gas Technology Gas production by accelerated bioleaching of organic materials
Get PDF - 8pp US4568457  1986-02 Sullivan  Envirex Inc. Staged anaerobic reactor
Get PDF - 7pp US4636467  1987-01 Chynoweth  Institute of Gas Technology Mixed microbial fermentation of carbonaceous matter to road de-icer
Get PDF - 7pp US4696746  1987-09 Ghosh et al.  Institute of Gas Technology Two phase anaerobic digestion
Get PDF - 11pp US4722741  1988-02 Hayes et al.  Gas Research Institute Production of high methane content product by two phase anaerobic digestion
Get PDF - 9pp US4735724  1988-04 Chynoweth et al.  Gas Research Institute Solids concentrating anaerobic digestion process and apparatus
Get PDF - 10pp US4826600  1989-05 Ely et al.  Amoco Corporation Process for treatment of wastewater
Get PDF - 12pp US5228995  1993-07 Stover   Biochemically enhanced hybrid anaerobic reactor
       
Foreign References:
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Publication Date IPC Code Assignee   Title
Get PDF - 12pp EP0097388 1984-01  C02F 3/28 CSM SUIKER A method and flow-sheet for adapting waste water, being rich in calcium, for an anaerobic fermentation 
Get PDF - 26pp EP0566056 1993-10  C02F 3/00 REA GESELLSCHAFT FÜR RECYCLING VON ENERGIE UND ABFALL MBH Process and apparatus for biological treatment of organic substances, especially for anaerobic biological hydrolysis following biomethanation 
  DE0401052 1924-08       


Other Abstract Info: CHEMABS 123(12)152038Q DERABS C95-246308

Other References:
  • Chynoweth, D. P. et al., "Biological Assessments of Anaerobic Digestion of Municipal Solid Waste", final report submitted to the Solar Energy Research Institute under U.S. DOE Contract No. DE-AC02-83CH10093, May 1991.
  • Srivastava, Vipul J. et al., "Methane Enrichment Digestion Experiments at the Anaerobic Experimental Test Unit at Walt Disney World", Final Report, Jun. 1993.
  • Chynoweth, David P. et al., "Microbial Production of Road Salt (Calcium Magnesium Acetate) From Biomass", A Proposal submitted to Minnesota Gas Company, Sep. 1983.
  • Pohland, F. G. et al., "Developments in Anaerobic Treatment Processes", Bio-Technology and Bio-Engineering, Symposium No. 2,85-106, John Wiley & Sons, Inc., 1971.
  • Pohland, F. G. et al., "Developments in Anaerobic Stabilization of Organic Wastes--The Two-Phase Concept", Environmental Letters, 1(4), pp. 255-266, Marcel Dekker, Inc., 1971.


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