Comparing sludge production under aerobic and anoxic conditions

The results of 32 batch tests demonstrate a significant difference in biomass yield under anoxic and aerobic conditions using a variety of soluble substrates. An anoxic yield of 0.402 mg particulate COD/mg consumed COD was calculated which is 62% of the corresponding aerobic yield of 0.645 mg partic...

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Bibliographic Details
Published in:Water science and technology 1998, Vol.38 (1), p.285-294
Main Authors: Copp, John B., Dold, Peter L.
Format: Article
Language:English
Subjects:
Activated sludge
aerobic
Aerobic conditions
Anoxia
anoxic
Anoxic conditions
Applied sciences
Biological and medical sciences
Biological treatment of waters
Biomass
Biotechnology
denitrification
Environment and pollution
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Mathematical analysis
Municipal wastewater
Other wastewaters
Oxic conditions
Pollution
respiration
Sludge
sludge production
Substrates
Tests
Wastewater
Wastewater treatment
Wastewaters
Water treatment and pollution
Water treatment plants
yield
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Summary:The results of 32 batch tests demonstrate a significant difference in biomass yield under anoxic and aerobic conditions using a variety of soluble substrates. An anoxic yield of 0.402 mg particulate COD/mg consumed COD was calculated which is 62% of the corresponding aerobic yield of 0.645 mg particulate COD/mg consumed COD. Batch tests were performed under anoxic and aerobic conditions using a seed of either activated sludge from one of two local municipal wastewater treatment facilities or a prepared sample of Pseudomonas denitrificans. Irrespective of the test organism, the calculated yields were consistent for each electron acceptor. A novel approach to quantifying the consumption of electron acceptor was employed in these batch tests. COD balance calculations were performed and confirmed that all of the initial COD could be accounted for in terms of residual soluble COD, biomass production and electron acceptor consumption.
ISSN:0273-1223
1996-9732
DOI:10.1016/S0273-1223(98)00413-2