Anaerobic digestion of organic waste for biogas production
A low solids aqueous suspensions of organic waste is treated in greater than or equal to 4, e.g., 6 serial anaerobic zones at less than 40/sup 0/ and under quiescent conditions to provide CH/sub 4/, fertilizer, and a clean liquid effluent. Thus, a fermentation system together with a biogas storage system, a generating plant, and an effluent-holding tank were installed on a pig farm. The digester constituted 3 tanks, sharing 2 common walls. The solids constituted 2% of the liquid-solid suspension added twice daily to the tanks. The system was operated for 6 mo. without removal of solids. Thereafter, solids were removed every 21 days and used as fertilizer. Cu sulfate (approximately 1 lb/10,000 gal) was added periodically every 2-3 wk, scrap Fe (approximately 3 ton) was added once, and Mo (2-3 lb.) was added once. The system generated 10,000-11,000 cubic feet gas/day and gas contained 75% CH/sub 4/. About 600 kW electricity/day was generated. BOD and COD of material entering the system and material exiting the system were measured, BOD and COD were reduced by 90-95%.
- Assignee:
- Biorganic Energy Inc.
- Patent Number(s):
- US 429043
- OSTI ID:
- 6067072
- Resource Relation:
- Patent File Date: Filed date 5 Jan 1982
- Country of Publication:
- United States
- Language:
- English
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20 FOSSIL-FUELED POWER PLANTS
BIOMASS CONVERSION PLANTS
DESIGN
OPERATION
FARMS
ON-SITE POWER GENERATION
FERTILIZERS
PRODUCTION
MANURES
ANAEROBIC DIGESTION
METHANE
BIOREACTORS
BIOSYNTHESIS
COPPER SULFATES
IRON
MOLYBDENUM
PERFORMANCE TESTING
SWINE
AGRICULTURAL WASTES
ALKANES
ANIMALS
BIOCONVERSION
COPPER COMPOUNDS
DIGESTION
DOMESTIC ANIMALS
ELEMENTS
HYDROCARBONS
MAMMALS
MANAGEMENT
METALS
ORGANIC COMPOUNDS
ORGANIC WASTES
OXYGEN COMPOUNDS
POWER GENERATION
PROCESSING
SULFATES
SULFUR COMPOUNDS
SYNTHESIS
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERTEBRATES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
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