Nitrogen removal from an AAO pilot plant with nitrifier bioaugmentation after seasonal deterioration

Liying PeiKey Lab of Water Resources, Environment and Ecology in Northwest China, Xi’an University of Architecture and Technology, Xi’an710055, P.R. ChinaTel./Fax: +86 2982201354Correspondence[email protected]

Dangcong PengKey Lab of Water Resources, Environment and Ecology in Northwest China, Xi’an University of Architecture and Technology, Xi’an710055, P.R. ChinaTel./Fax: +86 2982201354

Jilin WeiKey Lab of Water Resources, Environment and Ecology in Northwest China, Xi’an University of Architecture and Technology, Xi’an710055, P.R. ChinaTel./Fax: +86 2982201354

Binbin WangKey Lab of Water Resources, Environment and Ecology in Northwest China, Xi’an University of Architecture and Technology, Xi’an710055, P.R. ChinaTel./Fax: +86 2982201354

Xinyan ZhangKey Lab of Water Resources, Environment and Ecology in Northwest China, Xi’an University of Architecture and Technology, Xi’an710055, P.R. ChinaTel./Fax: +86 2982201354

Lifang YuKey Lab of Water Resources, Environment and Ecology in Northwest China, Xi’an University of Architecture and Technology, Xi’an710055, P.R. ChinaTel./Fax: +86 2982201354

Abstract

Nitrogen removal was studied in a pilot-scale anaerobic–anoxic–oxic (AAO) system that was bioaugmented with nitrifiers cultivated from reject water after seasonal deterioration. The process of nitrogen removal was evaluated with increased temperature from 11 to 24°C. Nitrification efficiency rapidly recovered with increased temperature from 12 to 15°C, and the nitrification rates at 18°C were 3.1 times that at 12°C, higher than the report in ASM1. Bioaugmentation may shorten the recovery time of nitrification activity in WWTPs. The nitrification activity and microbial ecology of the full-scale system operating parallel with the pilot-scale were correspondingly studied, and similar community structures were observed. Despite the lower nitrifying bacteria count, the nitrification activity of the bioaugmented pilot-scale plant was still higher than that of the full-scale one.

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Acknowledgements

The study was financially supported by National Water Pollution Control and Management Technology Major Projects of China (No. 2009ZX07317-009), National Natural Science Foundation for Young Scholars (Grant No. 51208414) and Science and Technology Innovation Project of Shaanxi Province (Grant No. 2011KTZB03-03-03). The authors also wish to express their gratitude to the 4th Wastewater Treatment Plant for providing support for this research.

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Nitrogen removal from an AAO pilot plant with nitrifier bioaugmentation after seasonal deterioration

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