Education and production. Chicken manure methanogenesis. 1. Selective inhibition of acetate conversion to methane
Thermophilic (55 C) methanogenesis of chicken manure was examined after prolonged acclimatization procedures. Unusual steady state parameters were obtained in quasi-continuous operations: volatile solids = 24 to 96 g/L, retention time = 5 to 20 days, in which methane was continuously formed (.5 to .7/L.L/day), H/sub 2/ was not present, but acetate (19 to 222 mM), other fatty acids, and ammonia nitrogen (800 to 2,830 mg/L) levels were very high. Tracer (2-(/sup 14/C) acetate) studies showed that acetate accumulation resulted from inhibition of acetate conversion to methane. Enumeration of H/sub 2/-oxidizing methanogenic populations as well as acetate-degrading methanogens indicated adequate populations in chicken manure relative to cow manure. Thus, measurement of acetate degradation activities indicated its inhibition, whereas bacterial enumeration studies indicated no lack of methanogenic bacterial populations. These findings are in disagreement with the uninhibited fast rate of aceticlastic methanogenesis in cow manure. Therefore, it may be concluded that the methanogenic populations are unchanged, but their capacity to decarboxylate acetate is somehow blocked, which would lead to concomittant accumulation of acetate in addition to the formation of CO/sub 2/ and H/sub 2//CO/sub 2/-derived methane as the major fermentation end products. (Refs. 33).
- Research Organization:
- Tel-Aviv Univ., Ramat Aviv, Israel; MIGAL, Galilee Technological Center, Kinyat Shemona 10200, Israel. Dept. Biotechnology, George S. Wise Faculty of Life Sciences; Tel-Aviv Univ., Ramat Aviv, Israel. Dept. Biotechnology, George S. Wise Faculty of Life Sciences
- OSTI ID:
- 5722600
- Journal Information:
- Poult. Sci.; (United States), Vol. 66:4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of temperature on methanogenesis in a thermophilic (58/sup 0/C) anaerobic digestor. [Methanosarcina sp. ; Methanothrix sp. ; Methanobacterium sp]
Methanogenesis in a thermophilic (58 degrees C) anaerobic digestor: Methanothrix sp. as an important aceticlastic methanogen
Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ACETATES
BIOCONVERSION
MANURES
ANAEROBIC DIGESTION
METHANE
PRODUCTION
AMMONIA
CARBON 14 COMPOUNDS
CARBOXYLIC ACIDS
CHICKENS
INHIBITION
NITROGEN
THERMOPHILIC CONDITIONS
TRACER TECHNIQUES
AGRICULTURAL WASTES
ALKANES
ANIMALS
BIRDS
CARBOXYLIC ACID SALTS
DIGESTION
ELEMENTS
FOWL
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC WASTES
PROCESSING
VERTEBRATES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
090122* - Hydrocarbon Fuels- Preparation from Wastes or Biomass- (1976-1989)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)
550501 - Metabolism- Tracer Techniques