CAST工艺常规模式下脱氮性能研究  

Study on nitrogen removal performance in conventional mode of CAST process

作　　者：张磊[1,2,3] 王少坡[1,2,3] 李玉友[1,2,3] 于静洁[1,2,3] 刘艳辉[1,2,3] 孙力平[1,2,3] 

机构地区：[1]天津城市建设学院环境与市政工程系,天津300384 [2]天津市水质科学与技术重点实验室,天津300384 [3]水质科学与技术联合实验室,天津300384

出　　处：《环境工程学报》2010年第12期2683-2686,共4页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50808128);国家水体污染控制与治理科技重大专项(2008ZX07314);中国博士后科学基金资助项目(20090460182)

摘　　要：研究了有效容积为21.6 L的循环式活性污泥法反应器在常规模式下,处理模拟废水时,有机污染物和氮污染物的去除情况,并分析了反应器脱氮过程中的限制性因素。结果表明,在反应器的运行周期为4 h(进水曝气2 h,沉淀和排水各1 h)好氧区DO>2 mg/L,污泥浓度MLSS稳定在4 000 mg/L时,污泥回流比为20%,COD和氨氮的去除率可达90%。对一个典型周期进行监测分析,氨氮去除彻底,出水主要是硝态氮,总氮去除率约为69%。静态试验测得氨氮氧化速率为8.0 mg NH4+-N/(g MLSS.h),硝态氮生成速率为3.3 mg NO3--N/(g MLSS.h)。从实验结果可以分析出,在上面运行条件下CAST工艺脱氮限制性因素是回流比和污泥龄。The removal performance of organic matter and nitrogen pollutants in conventional mode of CAST reactor with effective volume of 21.6 L feeded with simulation wastewater was studied.The limiting factors of nitrogen removal in the process were analyzed.When the reactor operated 4 h in one period,DO2 mg/L,MLSS was about 4 000 mg/L,the result showed that COD and ammonia removal could get 90%.It can be found that ammonia nitrogen was removed completely in aerobic zone and nitrate accumulation occurred in a typical cycle.Total nitrogen removal rate was about 69%.Static test showed that the ammonia oxidation rate was 8.0 mg NH＋4-N/（g MLSS·h） and the nitrate generation rate was 3.33 mg NO-3-N/（g MLSS·h） in the CAST reactor.Under the above process operating conditions,CAST nitrogen limiting factors were the sludge recycle ratio and SRT.

关 键 词：生物脱氮 循环式活性污泥法 硝化 反硝化 城市污水 

分 类 号：X703.1[环境科学与工程—环境工程]