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The effect of nitrite correction on the evaluation of the rate of nitrate utilization under anoxic conditions
Author(s) -
Sözen Seval,
Orhon Derin
Publication year - 1999
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199908)74:8<790::aid-jctb106>3.0.co;2-c
Subject(s) - nitrite , anoxic waters , nitrate , denitrification , chemistry , activated sludge , environmental chemistry , nitrogen , dietary nitrate , environmental engineering , inorganic chemistry , sewage treatment , environmental science , organic chemistry
The nitrogen utilization requirement (NUR) test is a useful respirometric procedure for the assessment of major kinetic constants in activated sludge systems designed for nitrogen removal. The electron transfer mechanism of nitrogenous compounds often involves significant nitrite accumulation which impairs the accuracy of the NUR test. Experimental results revealed no meaningful correlation between nitrite accumulation and the initial nitrate concentration or the food/microorganism (F/M) ratio. Significant impact of nitrite accumulation was observed both on the assessment of the readily biodegradable COD component, the correction factor for anoxic growth and the denitrification rates applicable to domestic sewage and a number of industrial wastewaters. © 1999 Society of Chemical Industry