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Inhibition of denitrification in activated sludge by nitrite

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Nitrite inhibition of denitrification was investigated using activated sludge that had been adapted to a wastewater containing moderately high levels of nitrate (1 350 mg/L as N) and salinity (40 000 mg/L total dissolved solids). After adaptation, the activated sludge was used to study pH effects on nitrite inhibition of denitrification over a range of 15 to 2 100 mg/L nitrite nitrogen (N02–N). A pH range of 6 to 8 was used. Using a zero-order model, it was found that the denitrification rate for 250 mg/L N02–N increased from 0.001 to 0.02 mg N/mg mixed liquor suspended solids (MLSS)┬Ěh as pH increased from 6 to 8. Denitrification rate reduction at the lower pH was probably caused by the accumulation of the species nitrous acid (HNO2), and the threshold inhibitory concentration for HNO2 was estimated to be low: less than 0.02 mg/L HNO2–N at pH 6. Mixed liquor suspended solids concentration appeared to have no effect on nitrite inhibition of denitrification.
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Keywords: ACTIVATED SLUDGE; DENITRIFICATION; INHIBITION; NITRITE

Document Type: Research Article

Publication date: 1997-09-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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