Two-phase anaerobic digestion of carbonaceous organic materials
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United States of America Patent
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Mar 19, 1996
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N/A
app pub date -
Nov 8, 1994
filing date -
Dec 28, 1993
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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effluent is fermented under anaerobic conditions in a methane phase digester, product gas comprising methane is withdrawn from the methane phase digester, and oxygen is introduced into the methane phase digester.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 CO.sub.2 stripper resulting in stripping of CO.sub.2 and H.sub.2 S from the methane phase liquid effluent. The resulting stripper liquid effluent comprising dissolved oxygen is then recycled back to the methane phase digester.
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