Energy recovery from the effluent of plants anaerobically digesting cellulosic urban solid waste. Final technical report, September 1978-September 1980
The program objective was to study the parameters of concentration, time, temperature, and pH to find optimum conditions for enzymatically converting unreacted cellulose in the effluent of an anaerobic digester to glucose for ultimate conversion to methane, and then to project the economics to a 100 tons per day (TPD) plant. The data presented illustrate the amount of cellulose hydrolysis (in percent solubilized mass) for enzyme concentrations from 5 to 1000 C/sub 1/U/gram of substrate using either filter paper or anaerobically digested municipal solid waste (MSW) reacted over periods of time of from 0 to 72 hours. With an active bacterial culture present, the optimum temperature for the hydrolysis reaction was found to be 40/sup 0/C. The feasibility of recycling enzymes by ultrafilter capture was studied and shows that the recovered enzyme is not denatured by any of several possible enzyme loss mechanisms, either chemical, physical, or biological. Although rather stable enzyme-substrate complexes seem to be formed, various techniques permit a 55% enzyme recovery. Posttreatment of digested MSW by cellulase enzymes produces nearly a three-fold increase in biomethanation. However, the value of the additional methane produced in the process as studied is not sufficient to support the cost of enzymes. The feasibility of enzymatic hydrolysis as a biomethanation process step requires further process optimization or an entirely different process concept.
- Research Organization:
- Systech Corp., Xenia, OH (USA)
- DOE Contract Number:
- AC01-78CS20451
- OSTI ID:
- 5961334
- Report Number(s):
- DOE/CS/20451-T2; ON: DE83015003
- Country of Publication:
- United States
- Language:
- English
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ALDEHYDES
ALKANES
ANAEROBIC DIGESTION
BIOCONVERSION
CARBOHYDRATES
CELLULASE
CELLULOSE
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DIAGRAMS
DIGESTION
ECONOMIC ANALYSIS
ECONOMICS
ENZYMATIC HYDROLYSIS
ENZYMES
EXPERIMENTAL DATA
FEASIBILITY STUDIES
FLOWSHEETS
GLUCOSE
GLYCOSYL HYDROLASES
HEXOSES
HYDROCARBONS
HYDROLASES
HYDROLYSIS
INDUSTRIAL PLANTS
INFORMATION
LIQUID WASTES
LYSIS
MANAGEMENT
METHANE
MONOSACCHARIDES
MUNICIPAL WASTES
NUMERICAL DATA
O-GLYCOSYL HYDROLASES
OPTIMIZATION
ORGANIC COMPOUNDS
POLYSACCHARIDES
PROCESSING
PRODUCTION
RECYCLING
SACCHARIDES
SOLVOLYSIS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PROCESSING PLANTS
WASTE PRODUCT UTILIZATION
WASTES