A control strategy of partial nitritation in a fixed bed biofilm reactor |
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Authors: | Liang Zhiwei Han Zhiying Yang Shangyuan Liang Xinqiang Du Ping Liu Guofang Yang Yue |
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Affiliation: | a Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, PR China b Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310029, PR China c Ministry of Agriculture Key Laboratory of Non-point Source Pollution Control, Hangzhou 310029, PR China |
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Abstract: | To achieve an appropriate mixture of ammonium and nitrite for anaerobic ammonium oxidation (ANAMMOX), 50% partial nitritation was optimized in a fixed bed biofilm reactor treating synthetic wastewater. Results suggested that 50% partial nitritation could be achieved by stepwise increases of influent NH4+-N at pH of 7.8 ± 0.2, temperature of 30 ± 1 °C and dissolved oxygen (DO) of 0.5-0.8 mg l−1. Hydraulic retention time (HRT) and influent alkalinity did significantly affect partial nitritation. At HRT 12 h, 50% partial nitritation could be kept stable, regardless of influent NH4+-N variation, by controlling the influent HCO3−/NH4+ molar ratio at 1:1. The fluorescent in situ hybridization (FISH) results indicated the abundance of evolution of ammonia-oxidizing bacteria (AOB) and the nitrite-oxidizing bacteria (NOB) coincided well with the performance of partial nitritation. Furthermore, the AOB were highly affiliated with Nitrosomonas spp. and Nitrosospira spp. dominated (64.1%) in the biofilm with a compact structure during the stable 50% partial nitritation period. |
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Keywords: | Partial nitritation Fixed bed biofilm reactor Stability Hydraulic retention time (HRT) Influent bicarbonate/ammonium molar ratio |
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