好氧颗粒污泥同步硝化反硝化脱氮过程中N_2O的产生

The Generation of N_(2)O with SND Aerobic Granular Sludge

对同步脱氮过程中影响N2O产生的条件进行了研究.结果表明,由于受反硝化反应影响,COD/NH+4—N比值为2,3时产生较多的N2O,分别为15mg/L和25mg/L;而比值为4,5时N2O生成量较少.同样,较高的溶氧质量浓度(3,4mg/L)减小了颗粒污泥内部的反硝化区域,反应产生较多的N2O,控制DO质量浓度在1～2mg/L,有利于减少N2O的排放.脱氮过程中添加NO-2—N和NO-2—N较NO-3—N更易3—N,反应产生大量的N2O,最多可以达到75mg/L.实验发现,NO-形成N2O.

The effecting conditions in the production of N_(2)O were studied in this study. With low COD/NH^+_4—N (2 and 3), the reaction of denitrification was restricted. Amount of N_(2)O was generated during the nitrogen removal process, and the concentrations reached 15 and 25 mg/L respectively. However, there were small amounts of N_(2)O produced while COD/NH^+_4—N was 4 and 5. With high DO concentration (3,4 mg/L) in broth, the activity of denitirification microorganism was affected, and there was more N_(2)O produced in the reaction. It was benefit to minimize the production of N_(2)O with DO at 1～2 mg/L. Adding NO^-_2—N and NO^-_3—N during reaction, N_2O was produced largely, and the concentration reached a maximum of 75 mg/L. Using NO^-_2—N, N_(2)O was produced easier than using NO^-_3—N.