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Some effects of aeration on anaerobic digestion

Abstract

The anaerobic digestion of meat works waste water is made possible by separating the sludge solids, after which necessary amounts of the concentrated sludge are returned to the digester. Sludge recirculation prolongs solid retention time in the digester. However, sludge separation by gravitational sedimentation is almost impossible because the sludge tends to rise with the continuous gassing. Therefore treatment of the sludge suspension prior to sedimentation is necessary for effective solid separation. The present study examined aeration degasification as a method for sludge suspension pretreatment and found that the rates of aeration of 0.75 to 1.0 VVM (0.12 to 0.16 cubic foot of air per gallon of mixed liquor per minute) were optimal for aeration degasification. The toxic effects on the anaerobic bacteria were small, daily gas production being reduced by only 5%.
Publication Date:
Jan 01, 1972
Product Type:
Book
Reference Number:
EDB-83-032196
Resource Relation:
Other Information: Thesis
Subject:
09 BIOMASS FUELS; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; METHANE; PRODUCTION; WASTE WATER; ANAEROBIC DIGESTION; BENCH-SCALE EXPERIMENTS; MEAT; PROCESSING; RECYCLING; SEPARATION PROCESSES; SLUDGES; YIELDS; ALKANES; BIOCONVERSION; DIGESTION; FOOD; HYDROCARBONS; HYDROGEN COMPOUNDS; LIQUID WASTES; MANAGEMENT; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; WASTE MANAGEMENT; WASTE PROCESSING; WASTES; WATER; 090122* - Hydrocarbon Fuels- Preparation from Wastes or Biomass- (1976-1989); 140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989); 320305 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management
OSTI ID:
6611288
Country of Origin:
New Zealand
Language:
English
Submitting Site:
HEDB
Size:
Pages: 58
Announcement Date:

Citation Formats

Bhywapathanapun, S. Some effects of aeration on anaerobic digestion. New Zealand: N. p., 1972. Web.
Bhywapathanapun, S. Some effects of aeration on anaerobic digestion. New Zealand.
Bhywapathanapun, S. 1972. "Some effects of aeration on anaerobic digestion." New Zealand.
@misc{etde_6611288,
title = {Some effects of aeration on anaerobic digestion}
author = {Bhywapathanapun, S}
abstractNote = {The anaerobic digestion of meat works waste water is made possible by separating the sludge solids, after which necessary amounts of the concentrated sludge are returned to the digester. Sludge recirculation prolongs solid retention time in the digester. However, sludge separation by gravitational sedimentation is almost impossible because the sludge tends to rise with the continuous gassing. Therefore treatment of the sludge suspension prior to sedimentation is necessary for effective solid separation. The present study examined aeration degasification as a method for sludge suspension pretreatment and found that the rates of aeration of 0.75 to 1.0 VVM (0.12 to 0.16 cubic foot of air per gallon of mixed liquor per minute) were optimal for aeration degasification. The toxic effects on the anaerobic bacteria were small, daily gas production being reduced by only 5%.}
place = {New Zealand}
year = {1972}
month = {Jan}
}