Thermochemical pretreatment of nitrogenous materials to increase methane yield
Nonoxidative thermochemical pretreatment can lead to substantial increases in the mesophilic anaerobic biodegradability of waste and sludge. This increase occurs in both the soluble and insoluble portions and is dependent on the temperature of treatment, and on the type of chemical used. The effect of thermochemical pretreatment on WAS is to promote hydrolysis and to split complex nitrogen polymers into simpler constituent molecules. However, as treatment conditions become more severe, nitrogen-containing organic material is formed which is refractory under the conditions studied. Thermochemical pretreatment causes the formation of toxic compounds, and this effect becomes more pronounced as treatment conditions become more severe. However, given sufficient time, methanogenic consortiums can acclimate to some extent to this inhibition. Oxygen appears not to be a controlling factor in the degradation of WAS. The refractory nature of nitrogenous materials in bacterial cells appears to be due in part to the protection afforded by the cell wall, but mostly to the inability of exocellular enzymes to hydrolyze complex nitrogenous macromolecules into simple biodegradable components. 5 figures, 7 tables.
- Research Organization:
- Stanford Univ., CA
- OSTI ID:
- 5747332
- Journal Information:
- Biotechnol. Bioeng. Symp.; (United States), Journal Name: Biotechnol. Bioeng. Symp.; (United States) Vol. 8; ISSN BIBSB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
090122* -- Hydrocarbon Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989)
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320604 -- Energy Conservation
Consumption
& Utilization-- Municipalities & Community Systems-- Municipal Waste Management-- (1980-)
ALKANES
ANAEROBIC CONDITIONS
ANAEROBIC DIGESTION
BIOCONVERSION
BIODEGRADATION
BIOSYNTHESIS
CELL CONSTITUENTS
CELL WALL
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DECOMPOSITION
DIGESTION
ELEMENTS
FLUIDS
HYDROCARBONS
HYDROLYSIS
LYSIS
MANAGEMENT
METHANE
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN
PROCESSING
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOLVOLYSIS
SYNTHESIS
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES