多点进水改良型复合A^2/O处理低C/N污水  

Treatment of low C/N wastewater by combined A^2/O process with multipoint feeding

作　　者：李思敏[1] 杜国帅[1] 唐锋兵[1] 

机构地区：[1]河北工程大学城市建设学院,河北邯郸056038

出　　处：《化工学报》2013年第10期3805-3811,共7页CIESC Journal

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07203003);河北省应用基础研究计划重点基础研究项目(12966738D);邯郸市科学技术研究与发展计划项目(1213109010G)~~

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 tanks whose effluent flowed into aerobic tank to reduce the sludge flow path. Under s.. average influent COD/TN ratio 5.54, HRT 11 h, flux ratio 50%, the effect of inflow distribution ratio phorus removal was investigated. The results showed and anoxic the SRT 15 d, MLSS 3000-4000 mg and internal reflux ratio that the optimal inflow optimal ·L-1, on denitrification 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, NI-t3-N, TN and TP in effluent were 29.7 mg ·L-1, 0.1 mg·L-1, 11.8 mg ·L-1 and 0.42 mg·L-1 respectively 87.8%, 99.7%, 72.4% and 91.3% respectively. The effluent the discharging 2002）. At the observed. the average removal of could be better than the ficiency reached first level A of standard of pollutants for municipal wastewater treatment plant （WWTP） （GB 18918- same time, in anoxic tank noteworthy denitrification and phosphorus removal were

关 键 词：改良A2 O工艺 低C N比 脱氮除磷 进水分配比 反硝化除磷 

分 类 号：X703.1[环境科学与工程—环境工程]