Achieving partial nitrification by inhibiting the activity of Nitrospira-like bacteria under high-DO conditions in an intermittent aeration reactor  

作　　者：Peng Bao Shuying Wang Bin Ma Qiong Zhang Yongzhen Peng 

机构地区：[1]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Engineering Research Center of Beijing,Beijing University of Technology,Beijing 10024,China

出　　处：《Journal of Environmental Sciences》2017年第6期71-78,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51478013)

摘　　要：It is generally accepted that a low dissolved oxygen （DO） concentration is more beneficial for achieving partial nitrification than high-DO. In this study, partial nitrification was not established under low-DO conditions in an intermittent aeration reactor for treating domestic wastewater. During the operational period of low-DO conditions （DO： 0.3 ± 0.14 rag/L）, stable complete nitrification was observed. The abundance of Nitrospira-like bacteria, which were the major nitrite-oxidizing bacteria, increased from 1.03 x 10^6 to 2.64 x 10^5 cells/mL. At the end of the low-DO period, the batch tests showed that high-DO concentration （1.5, 2.0mg/L） could inhibit nitrite oxidation, and enhance ammonia oxidation. After switching to the high-DO period （1.8 ± 0.32 mg/L）, partial nitrification was gradually achieved. Nitrospira decreased from 2.64 x 10^6 to 8.85 x 10^5 cells/mL. It was found that suddenly switching to a high-DO condition could inhibit the activity and abundance of Nitrospira-like bacteria, resulting in partial nitrification.It is generally accepted that a low dissolved oxygen （DO） concentration is more beneficial for achieving partial nitrification than high-DO. In this study, partial nitrification was not established under low-DO conditions in an intermittent aeration reactor for treating domestic wastewater. During the operational period of low-DO conditions （DO： 0.3 ± 0.14 rag/L）, stable complete nitrification was observed. The abundance of Nitrospira-like bacteria, which were the major nitrite-oxidizing bacteria, increased from 1.03 x 10^6 to 2.64 x 10^5 cells/mL. At the end of the low-DO period, the batch tests showed that high-DO concentration （1.5, 2.0mg/L） could inhibit nitrite oxidation, and enhance ammonia oxidation. After switching to the high-DO period （1.8 ± 0.32 mg/L）, partial nitrification was gradually achieved. Nitrospira decreased from 2.64 x 10^6 to 8.85 x 10^5 cells/mL. It was found that suddenly switching to a high-DO condition could inhibit the activity and abundance of Nitrospira-like bacteria, resulting in partial nitrification.

关 键 词：Partial nitrificationDissolved oxygenNitrospira Bioreactors 

分 类 号：X172[环境科学与工程—环境科学] X799.3