The effects of environmental factors on acid-phase digestion of sewage sludge
The two-phase anaerobic digestion process consists of two fermenters operated in series, wherein the acidification and gasification reactions are optimized in separate reactors to improve the overall system conversion efficiency. This paper discusses the results of tests conducted with bench-scale complete-mix acid-phase digesters to determine the effects of culture pH, temperature, and hydraulic retention time (HRT) on the efficiency of sewage sludge digestion. Tests were conducted at culture pH's of 5, 5.5, 6, and 7 at mesophilic (35/degree/C) and thermophilic (55/degree/C) temperatures and at HRT's of 1.3 and 2 days. Digestion efficiencies were determined on the basis of volatile acid production, gas production, and the reduction of the major particulate components of the feed sludge (crude protein, carbohydrates, and lipids). Efficiencies were highly dependent on each of the three control factors and were generally optimized at the higher extremes of pH, temperature, and HRT tested. 9 refs., 2 figs., 10 tabs.
- Research Organization:
- Institute of Gas Technology, Chicago, IL (USA)
- OSTI ID:
- 6802981
- Report Number(s):
- CONF-8705302-2; ON: DE88017159
- Resource Relation:
- Conference: 42. Purdue industrial waste conference, West Lafayette, IN, USA, 12 May 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ANAEROBIC DIGESTION
EFFICIENCY
SEWAGE SLUDGE
BENCH-SCALE EXPERIMENTS
METHANE
PH VALUE
TEMPERATURE EFFECTS
YIELDS
ALKANES
BIOCONVERSION
DIGESTION
HYDROCARBONS
MANAGEMENT
ORGANIC COMPOUNDS
PROCESSING
SEWAGE
SLUDGES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
320604* - Energy Conservation
Consumption
& Utilization- Municipalities & Community Systems- Municipal Waste Management- (1980-)
550700 - Microbiology