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Comprehensive assessment of free nitrous acid based technology to establish partial nitrification

Abstract

Treating activated sludge with free nitrous acid (FNA) to selectively eliminate nitrite oxidizing bacteria (NOB) and retain ammonium oxidizing bacteria (AOB) is increasingly regarded as a promising technology for achieving partial nitrification. This study provided a comprehensive assessment of this technology on optimal FNA treatment conditions, functional microbial community response, and resistibility of established partial nitrification to high dissolved oxygen (DO) concentration and low temperature. An FNA concentration of 1.2 mg HNO2-N/L and an exposure time of 18 hours were found to be the most effective conditions to simultaneously inactivate NOB completely and maintain AOB activity of 56.76%. Under these conditions, no damaging side effects on the functional microbial community were observed, except for the NOB groups being substantially reduced. The results of two 10 L SBRs inoculated with FNA-treated sludge and operated under different DO concentrations and temperatures showed that stable partial nitrification could be maintained at DO as high as 3.0 mg/L and temperature as low as 5 ℃. However, vigorous multiplication of NOB, especially Nitrobacter, caused a destruction of the partial nitrification after long-term operation under DO of 5.0 mg/L. Although stable partial nitrification was not destroyed by low temperature, the ammonia oxidation rate was impaired.

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Publication details

The article was accepted on 04 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8EW00637G
Citation: Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript
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    Comprehensive assessment of free nitrous acid based technology to establish partial nitrification

    C. Jiang, S. Xu, R. Wang, S. Zhou, S. Wu, X. Zeng, Z. Bai, G. Zhuang and X. Zhuang, Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8EW00637G

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