多点进水改良型复合A~2/O处理低C/N污水
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摘要
以低C/N比城市生活污水为研究对象,重点考查了改良A2/O工艺的脱氮除磷性能。原水按一定比例分配给厌氧池和缺氧池,以合理分配厌氧释磷和缺氧反硝化所需的碳源;在好氧池和缺氧池中分别投加填料,以稳定系统的硝化和反硝化效果,提高系统的脱氮性能;厌氧池和缺氧池出水都直接进入好氧池。在进水COD/TN平均为5.54,HRT为11h,SRT为15d,MLSS为3000~4000mg·L-1,污泥回流比为50%条件下,通过三种不同进水分配比以及三种混合液回流比的对比试验研究,得到系统最佳进水分配比5∶5,对分配脱氮和除磷所需碳源更加合理;而混合液回流比为200%,过高会破坏缺氧池的溶解氧环境,过低又会导致缺氧池反硝化作用不能充分发挥。在最优工况下COD、NH3-N、TN和TP出水水质分别为29.7、0.1、11.8和0.42mg·L-1,平均去除率分别达到87.8%、99.7%、72.4%和91.3%,出水优于国家GB 18918—2002一级A排放标准,并且在缺氧池中发生了明显的反硝化除磷现象。
Using domestic sewage with low C/N as treatment objective,the performance of modified A2/O process for denitrification and phosphorus removal was investigated.In order to suitable allocation of carbon sources required by anaerobic phosphorus release and anoxic denitrification,raw water was distributed into anaerobic tank and anoxic tank according to different proportion.To stabilize nitrification and denitrification processes and improve their efficiency some packing was filled in aerobic and anoxic tanks whose effluent flowed into aerobic tank to reduce the sludge flow path.Under the optimal conditions:average influent COD/TN ratio 5.54,HRT 11h,SRT 15d,MLSS 3000—4000mg·L-1,sludge reflux ratio 50%,the effect of inflow distribution ratio and internal reflux ratio on denitrification and phosphorus removal was investigated.The results showed that the optimal inflow distribution ratio was 5∶5,at which iallocation of carbon source was reasonable for denitrification and phosphorous removal.And the optimal reflux ratio was 200%,if it is too high DO environment in anaerobic tank could be damaged and if it is too low the efficiency of denitrification in anoxic tank could not be full played.Under these optimal operating conditions,COD,NH3-N,TN and TP in effluent were 29.7 mg·L-1,0.1mg·L-1,11.8 mg·L-1 and 0.42 mg·L-1 respectively,the average removal efficiency reached87.8%,99.7%,72.4% and 91.3% respectively.The effluent could be better than the first level A of the discharging standard of pollutants for municipal wastewater treatment plant(WWTP)(GB 18918—2002).At the same time,in anoxic tank noteworthy denitrification and phosphorus removal were observed.
Using domestic sewage with low C/N as treatment objective,the performance of modified A2/O process for denitrification and phosphorus removal was investigated.In order to suitable allocation of carbon sources required by anaerobic phosphorus release and anoxic denitrification,raw water was distributed into anaerobic tank and anoxic tank according to different proportion.To stabilize nitrification and denitrification processes and improve their efficiency some packing was filled in aerobic and anoxic tanks whose effluent flowed into aerobic tank to reduce the sludge flow path.Under the optimal conditions:average influent COD/TN ratio 5.54,HRT 11h,SRT 15d,MLSS 3000—4000mg·L-1,sludge reflux ratio 50%,the effect of inflow distribution ratio and internal reflux ratio on denitrification and phosphorus removal was investigated.The results showed that the optimal inflow distribution ratio was 5∶5,at which iallocation of carbon source was reasonable for denitrification and phosphorous removal.And the optimal reflux ratio was 200%,if it is too high DO environment in anaerobic tank could be damaged and if it is too low the efficiency of denitrification in anoxic tank could not be full played.Under these optimal operating conditions,COD,NH3-N,TN and TP in effluent were 29.7 mg·L-1,0.1mg·L-1,11.8 mg·L-1 and 0.42 mg·L-1 respectively,the average removal efficiency reached87.8%,99.7%,72.4% and 91.3% respectively.The effluent could be better than the first level A of the discharging standard of pollutants for municipal wastewater treatment plant(WWTP)(GB 18918—2002).At the same time,in anoxic tank noteworthy denitrification and phosphorus removal were observed.
引文
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[3]Wang Hongchen(王洪臣),Zhou Jun(周军),Wang Jiawei(王佳伟),Gan Yiping(甘一萍),Fang Xianjin(方先金).5F-A2/O Process—Practice and Exploration on Nitrogen and Phosphorus Removal(5F-A2/O——脱氮除磷工艺的实践与探索)[M].Beijing:China Architecture&Building Press,2009:25
[4]Wang Xiaolian(王晓莲),Peng Yongzhen(彭永臻).Technology and the Application of Removing Phosphorus and Nitrogen Biological Nitrogen and Phosphorus Removal in A2/O(A2/O法污水生物脱氮除磷处理技术与应用)[M].Beijing:Science Press,2009
[5]Zhang Jie(张杰),Zang Jinghong(臧景红),Yang Hong(杨宏),Liu Junliang(刘俊良).A study on the inherent shortcomings and countermeasures of the A2/O process[J].Water&Wastewater Engineering(给水排水),2003,29(3):22-26
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[9]Rahimi Y,Torabian A,Mehrdadi N,et al.Simultaneous nitrification-denitrification and phosphorus removal in a fixed bed sequencing batch reactor(FBSBR)[J].Journal of Hazardous Materials,2011,185:852-857
[10]Xu Weifeng(徐伟锋),Gu Guowei(顾国维),Zhang Fang(张芳).Effect of internal return ratio on denitrifying phosphorus removal in A/A/O process[J].Journal of Chemical Industry and Engineering(China)(化工学报),2007,58(10):2619-2623
[11]Chen Yongzhi(陈永志),Peng Yongzhen(彭永臻),Wang Jianhua(王建华),Gu Shengbo(顾升波).Denitrifying phosphorus removal in A2/O-BAF process[J].CIESC Journal(化工学报),2011,62(3):797-804
[12]Hu Zhirong,Wentzel M C,Ekama G A.Anoxic growth of phosphate-accumulating organism(PAOs)in biological nutrient removal activated sludge system[J].Water Res.,2002,36:4927-4937
[13]Wu Changyong(吴昌永),Peng Yongzhen(彭永臻),Peng Yi(彭轶).Biological nutrient removal in A2 O process when treating low C/N ratio domestic wastewater[J].Journal of Chemical Industry and Engineering(China)(化工学报),2008,59(12):3126-3131
[2]Chen Yongzhi(陈永志),Peng Yongzhen(彭永臻),Wang Jianhua(王建华),Zhang Liangchang(张良长).Biological phosphorus and nitrogen removal in low C/N ratio domestic sewage treatment by a A2/O-BAF combined system[J].Acta Scientiae Circumstantiae(环境科学学报),2010,30(10):1957-1963
[3]Wang Hongchen(王洪臣),Zhou Jun(周军),Wang Jiawei(王佳伟),Gan Yiping(甘一萍),Fang Xianjin(方先金).5F-A2/O Process—Practice and Exploration on Nitrogen and Phosphorus Removal(5F-A2/O——脱氮除磷工艺的实践与探索)[M].Beijing:China Architecture&Building Press,2009:25
[4]Wang Xiaolian(王晓莲),Peng Yongzhen(彭永臻).Technology and the Application of Removing Phosphorus and Nitrogen Biological Nitrogen and Phosphorus Removal in A2/O(A2/O法污水生物脱氮除磷处理技术与应用)[M].Beijing:Science Press,2009
[5]Zhang Jie(张杰),Zang Jinghong(臧景红),Yang Hong(杨宏),Liu Junliang(刘俊良).A study on the inherent shortcomings and countermeasures of the A2/O process[J].Water&Wastewater Engineering(给水排水),2003,29(3):22-26
[6]Zhang Bo(张波),Gao Tingyao(高廷耀).Principle and characteristics of reversed A2/O process[J].China Water&Wastewater(中国给水排水),2000,16(7):11-15
[7]Artiga P,Oyanedel V,Garrido J M,et al.An innovative biofilm-suspended biomass hybrid membrane bioreactor for wastewater treatment[J].Desalination,2005,179(1-3SPEC.ISS.):171-179
[8]State Environmental Protection Administration of China(国家环保总局).Inspects and Analysis Methods of Water and Wastewater(水和废水监测分析方法)[M].4th ed.Beijing:China Environmental Science Press,2002
[9]Rahimi Y,Torabian A,Mehrdadi N,et al.Simultaneous nitrification-denitrification and phosphorus removal in a fixed bed sequencing batch reactor(FBSBR)[J].Journal of Hazardous Materials,2011,185:852-857
[10]Xu Weifeng(徐伟锋),Gu Guowei(顾国维),Zhang Fang(张芳).Effect of internal return ratio on denitrifying phosphorus removal in A/A/O process[J].Journal of Chemical Industry and Engineering(China)(化工学报),2007,58(10):2619-2623
[11]Chen Yongzhi(陈永志),Peng Yongzhen(彭永臻),Wang Jianhua(王建华),Gu Shengbo(顾升波).Denitrifying phosphorus removal in A2/O-BAF process[J].CIESC Journal(化工学报),2011,62(3):797-804
[12]Hu Zhirong,Wentzel M C,Ekama G A.Anoxic growth of phosphate-accumulating organism(PAOs)in biological nutrient removal activated sludge system[J].Water Res.,2002,36:4927-4937
[13]Wu Changyong(吴昌永),Peng Yongzhen(彭永臻),Peng Yi(彭轶).Biological nutrient removal in A2 O process when treating low C/N ratio domestic wastewater[J].Journal of Chemical Industry and Engineering(China)(化工学报),2008,59(12):3126-3131