碱度对常低温生活污水亚硝化的影响必威体育精装版.docVIP

碱度对常低温生活污水亚硝化的影响 (1.哈尔滨工业大学 城市水资源与水环境国家重点实验室，150090 哈尔滨，HYPERLINK mailto:zhang_xiao_jing@126.com zhang_xiao_jing@126.com； 2.北京工业大学 水质科学与水环境恢复工程北京市重点实验室，100124 北京) 摘要：为了探究碱度对亚硝化过程的影响及通过碱度控制氨氮转化率的可行性，在SBR内快速启动亚硝化后考察了不同进水碱度/氨氮比下（A/a比）的氨氮转化率、氨氮氧化速率及微生物活性。结果表明，硝化污泥经高氨氮预驯化可以实现亚硝化的快速启动，亚氮积累率维持在96%以上。碱度不足时，氨氮转化率与进水碱度/氨氮比成线性关系，可以灵活控制出水亚硝化比例，在一个周期中，碱度对亚氮含量有很好的指示作用，碱度小于50mg/L时，氨氮氧化停止，比无机碳源浓度小于3.0mmol/mgVSS时将导致微生物数量下降，活性降低。碱度不足有利于保证亚硝化的稳定性，通过进水碱度/氨氮比的调节可以实现半亚硝化，但应适当定期补充无机碳源。 关键词：SBR；生活污水；亚硝化；HRT；进水碱度/氨氮 中图分类号：X703.1 文献标志码：A Partial nitrification in a sequencing batch reactor treating domestic sewage at ordinary and low temperatures ZHANG Xiao-jing1, LI Dong2, Wu Di2, Zhou Li-jun2, ZHANG Jie1,2 (1.State Key Laboratory of Urban Water Resource and Environment，Harbin Institute of Technology，Harbin 150090, China, zhang_xiao_jing@126.com; 2.Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China ) Abstract: In order to research the alkalinity effect on partial nitritation(PN) of SBR treating domestic sewage at ordinary and low temperatures and the feasibility to control the ammonia conversion rate, the PN was rapidly started-up in a sequencing batch reactor. The ammonia conversion rate, ammonia oxidation rate and the activity of the microorganisms was investigated in different ratio of the inflow alkalinity to ammonia. Results suggested that nitritation could be achieved quickly by pre-cultivating the sludge with high ammonia nitrogen, and over 96% nitritation was sustained. 50% partial nitritation could be achieved when the HRT was decreased to 2h or the ratio of alkalinity/ammonia in inflow was decreased to 3.6. However, the number and activity of the microorganism decreased sharply under a long-term operation with insufficient alkalinity, the oxidation of ammonia would stop while the alkalinity reduced to less than 50 mg/L. Cycle experiment showed FNA and FA as the key factors maint