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Performance and Kinetics of Nitrification of Low Ammonia Wastewater at Low Temperature

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The objective of this study was to investigate the effect of dissolved oxygen on nitrification in a sequencing batch reactor (SBR) treating low ammonia wastewater (40 mg N/L) at a low temperature (14 °C). During the 130 days of operation, three dissolved oxygen levels (5‐6 mg dissolved oxygen/L, 2‐3 mg dissolved oxygen/L, and 0.8‐1.0 mg dissolved oxygen/L) were tested. Dissolved oxygen reduction resulted in lower ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) activity, with decreasing ammonia conversion ratio and increasing nitrite accumulation ratio. The maximum growth rates of AOB and NOB determined in this study (0.28 and 0.38 d−1) were below the median values from the literature (0.47 and 0.62 d−1), whereas the oxygen half-saturation coefficients of AOB and NOB (1.36 and 2.79 mg/L) were higher than those found in the literature. The kinetic model explained the SBR performance well. Low dissolved oxygen, together with long solids retention time, was recommended for partial nitrification at a low temperature.
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Keywords: dissolved oxygen; kinetic analysis; low ammonia; low temperature; nitritation

Document Type: Research Article

Publication date: 01 June 2018

This article was made available online on 25 July 2017 as a Fast Track article with title: "Performance and kinetics of nitrification of low ammonia wastewater at low temperature".

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    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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