N2O Production during Nitrogen Removal via Nitrite from Domestic Wastewater: Main Sources and Control Method

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• 作者：Qing Yang ; Xiuhong Liu ; Chengyao Peng ; Shuying Wang ; Hongwei Sun ; Yongzhen Peng
• 刊名：Environmental Science & Technology
• 出版年：2009
• 出版时间：December 15, 2009
• 年：2009
• 卷：43
• 期：24
• 页码：9400-9406
• 全文大小：294K
• 年卷期：v.43,no.24(December 15, 2009)
• ISSN：1520-5851

文摘

Nitrite has been commonly recognized as an important factor causing N₂O production, which weakened the advantages of nitrogen removal via nitrite. To reduce and control N₂O production from wastewater treatment plants, both long-term and batch tests were carried out to investigate main sources and pathways of N₂O production during nitrogen removal via nitrite from real domestic wastewater. The obtained results showed that N₂O production during nitrogen removal via nitrite was 1.5 times as much as that during nitrogen removal via nitrate. It was further demonstrated that ammonia oxidization were main source of N₂O production during nitrogen removal from domestic wastewater; whereas, almost no N₂O was produced during nitrite oxidization and anoxic denitrification. N₂O production during nitrogen removal via nitrite decreased about 50% by applying the step-feed SBR, due to the effective control of nitrite and ammonia, the precursors of N₂O production. Therefore, the step-feed system is recommended as an effective method to reduce N₂O production during nitrogen removal via nitrite from domestic wastewater.