欢迎访问《环境科学学报》编辑部网站！

快速检索			高级检索

污染控制技术及原理

基金项目：“十一五”国家科技支撑计划重点项目(No.2006BAC19B03,2007.1-2010.12);北京工业大学研究生科技基金资助课题(No.ykj-2007-1063);北京市高校人才强教深化计划高层次人才资助项目(No.PHR20090502)

摘要：试验采用经过长期驯化,控制污泥龄分别为9d和15d的活性污泥,以实际生活污水为研究对象,考察了不同污泥龄(SRT)对污水脱氮过程中N₂O的产生量和转化率的影响.结果表明N₂O主要产生于污水脱氮的硝化过程中,而反硝化过程的贡献较少.较短的污泥龄有利于脱氮过程中N₂O的产生,9d污泥龄的活性污泥系统产生N₂O量是15d污泥龄污泥系统的1.2倍,分别为4.62mg·mL^-1和3.8mg·mL^-1.不同污泥龄条件下产生N₂O的转化率也有所差别,污泥龄较短的活性污泥系统产生N₂O的转化率也较高,分别为11.2%和7.8%.系统经长期在较短的污泥龄下运行,并没有影响系统的脱氮效果,两种污泥龄条件下系统的脱氮率都在96%以上.为了减少污水脱氮过程中N₂O的产生量,应避免污水处理系统过短的污泥龄,造成污水脱氮过程N₂O的产量和转化率的大幅升高.

Abstract：We investigated the production and conversion rate of N₂O during nitrification and denitrification under different sludge retention times(SRT):9 d and 15 d.The results showed that nitrification was the main source of N₂O.The N₂O production with SRT 9 d was 1.2 times higher than that with SRT 15 d.The production and conversion rate of N₂O during nitrification and denitrification under different SRTconditions were also investigated.The results turned out that the N₂O production was 4.62 mg·L^-1 with SRT 9 d and 3.8 mg·L^-1 with SRT 15d.The conversion rate was 11.2% with SRT 9d and 7.8% with SRT 15d.The long time domesticated short SRTsystem can perform a good nitrogen removal rate,under the two SRTconditions,the nitrogen removal rates were all above 96%.Consequently,in order to reduce N₂O production,it is necessary to keep a long SRTto avoid increasing the N₂O production and conversion rate.