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Effect of mixing duration and vacuum on methane production rate from beef cattle waste

Journal Article · · Biotechnol. Bioeng. Symp.; (United States)
The effects of mixing duration and vacuum on methane production rates from anaerobically fermented beef cattle wastes were discussed. The results showed that continuously mixed fermentors produced significantly (P < 0.05) higher methane production rates than fermentors mixed two hours per day. However, the rates from the continuously mixed fermentors were only 8-11% higher than the intermittently mixed fermentors at six and four days hydraulic retention time (HRT), respectively. There was no significant difference between the vacuum and conventional fermentors at six days HRT, but there was a significant difference at four days HRT. The CH/sub 4/ production rate of the vacuum fermentors was 5% higher than the conventional fermentors at four days HRT. The results of these experiments compared well with predicted CH/sub 4/ production rates. These results suggest that there is little potential for increasing the fermentation rates of livestock wastes by increased mixing or vacuum.
Research Organization:
Roman L. Hruska U.S. Meat Animal Research Center, Clay Center, NE
OSTI ID:
5440571
Journal Information:
Biotechnol. Bioeng. Symp.; (United States), Journal Name: Biotechnol. Bioeng. Symp.; (United States) Vol. 24:1; ISSN BIBSB
Country of Publication:
United States
Language:
English

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Related Subjects

09 BIOMASS FUELS
090122* -- Hydrocarbon Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
140504 -- Solar Energy Conversion-- Biomass Production &amp; Conversion-- (-1989)
AGRICULTURAL WASTES
ALKANES
ANAEROBIC DIGESTION
ANIMALS
BIOCONVERSION
BIOSYNTHESIS
CATTLE
DIGESTION
DOMESTIC ANIMALS
FERMENTATION
HYDROCARBONS
MAMMALS
MANAGEMENT
MANURES
METHANE
MIXING
OPTIMIZATION
ORGANIC COMPOUNDS
ORGANIC WASTES
PROCESSING
PRODUCTION
RESPONSE MODIFYING FACTORS
RUMINANTS
SYNTHESIS
VACUUM FERMENTATION
VERTEBRATES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES