Two phase anaerobic digestion
Patent 4022665 Issued on May 10, 1977. Estimated Expiration Date: 
May 10, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 10, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1990523 3640846 InventorsAssigneeApplicationNo. 05/530760 filed on 12/09/1974US Classes:435/167, Only acyclic210/603, Including collecting or storing gas (e.g., fuel, carbon monoxide, etc.)435/140, Acetic acid435/141, Propionic or butyric acid435/801, ANEROBIC CULTIVATION435/819, FERMENTATION VESSELS IN SERIES435/822, Using bacteria or actinomycetales48/197ASewage treatmentExaminersPrimary: Tanenholtz, Alvin E.Attorney, Agent or FirmAbstractAn improved two phase anaerobic digestion process in which an initial phase continually receives an organic feed for short detention times of less than two days under conditions which efficiently liquefy and breakdown the feed to lower molecular weight acids and other intermediates for conversion to methane. A succeeding phase is operated to treat the lower molecular weight acids and intermediates for detention times of about two to about seven days under conditions which efficiently lead to production of methane. The feed is loaded in the first phase at rates from about 1 to about 10 pounds of total organics per cubic foot per day; and the products from the initial phase are loaded in the succeeding phase at rates of about 0.1 to about 0.5 pounds total organics per cubic foot per day.Other References
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