Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, and School of Municipal and Environmental Engineering, Harbin Institute of Technology.
Environ Sci Technol. 2009 Dec 15;43(24):9400-6. doi: 10.1021/es9019113.
Nitrite has been commonly recognized as an important factor causing N(2)O production, which weakened the advantages of nitrogen removal via nitrite. To reduce and control N(2)O production from wastewater treatment plants, both long-term and batch tests were carried out to investigate main sources and pathways of N(2)O production during nitrogen removal via nitrite from real domestic wastewater. The obtained results showed that N(2)O 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 N(2)O production during nitrogen removal from domestic wastewater; whereas, almost no N(2)O was produced during nitrite oxidization and anoxic denitrification. N(2)O 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 N(2)O production. Therefore, the step-feed system is recommended as an effective method to reduce N(2)O production during nitrogen removal via nitrite from domestic wastewater.
亚硝酸盐已被普遍认为是导致 N(2)O 产生的一个重要因素，这削弱了通过亚硝酸盐进行脱氮的优势。为了减少和控制污水处理厂中 N(2)O 的产生，通过进行长期和批量试验，研究了从实际生活污水中通过亚硝酸盐进行脱氮过程中 N(2)O 产生的主要来源和途径。研究结果表明，通过亚硝酸盐进行脱氮过程中 N(2)O 的产生量是通过硝酸盐进行脱氮过程中的 1.5 倍。进一步证明了氨氧化是从生活污水中脱氮过程中 N(2)O 产生的主要来源；而在亚硝酸盐氧化和缺氧反硝化过程中几乎没有 N(2)O 产生。通过采用分步进料 SBR，可使通过亚硝酸盐进行脱氮过程中 N(2)O 的产生量减少约 50%，因为该方法可有效控制 N(2)O 产生的前体物——亚硝酸盐和氨。因此，推荐采用分步进料系统作为从生活污水中通过亚硝酸盐进行脱氮过程中减少 N(2)O 产生的有效方法。
