CONFIRMING THE NITRATE-TO-OXYGEN CONVERSION FACTOR FOR DENiTRIFICATION

A number of studies have identified the possible phenomenon of COD ``loss'' in nutrient removal activated sludge systems incorporating unaerated zones. One potential cause for the calculated ``loss'' is in the mathematical assumption made with regards to nitrate reduction in deni...

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Bibliographic Details
Published in:Water research (Oxford) 1998-04, Vol.32 (4), p.1296-1304
Main Authors: Copp, John B., Dold, Peter L.
Format: Article
Language:English
Subjects:
activated sludge
Biological and medical sciences
Biological treatment of waters
Biotechnology
COD balances
denitrification
Environment and pollution
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
nitrate-to-oxygen equivalents
nutrient removal
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Summary:A number of studies have identified the possible phenomenon of COD ``loss'' in nutrient removal activated sludge systems incorporating unaerated zones. One potential cause for the calculated ``loss'' is in the mathematical assumption made with regards to nitrate reduction in denitrification. In the COD balance calculation a factor is used to convert the amount of nitrate used as a terminal electron acceptor to an equivalent amount of oxygen. The theoretical conversion factor of 2.86 gO 2 per gNO 3-N denitrified is derived from oxidation/reduction half-reactions. Data from twelve 1 L dentrification batch tests in a closed reactor system were used to confirm this factor. A value of 2.96 was observed but could not be distinguished statistically from the theoretical value. Interpretation of the data also revealed that no COD was ``lost'' in these dominant denitrifier experiments with a simple soluble substrate.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(97)00289-3