HRT对改良式A^2/O-BAF反硝化除磷脱氮的影响  

Effect of HRT on Denitrifying Phosphorus and Nitrogen Removal in Modified A^2/O-BAF

作　　者：赵凯亮 刘安迪 南彦斌 梁利民 王云霞 陈永志[1,2] ZHAO Kai-liang;LIU An-di;NAN Yan-bin;LIANG Li-min;WANG Yun-xia;CHEN Yong-zhi(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Technical Center of Sewage Treatment Industry in Gansu,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]甘肃省污水处理行业技术中心,兰州730070

出　　处：《环境科学》2020年第6期2771-2778,共8页Environmental Science

基　　金：国家自然科学基金项目(51668033);甘肃省自然科学基金项目(18JR3RA126);甘肃省高等学校特色专业-环境工程项目(101004);兰州交通大学大学生创新创业训练计划项目(2019121)。

摘　　要：研究HRT(水力停留时间)对改良式A2/O-BAF双污泥系统反硝化除磷脱氮的影响.进水COD、NH4^+-N和TP分别为189.6、60.4和5.1mg·L^-1,HRT分别为9、8、7和6 h时,COD出水平均浓度均小于42mg·L^-1,NH4^+-N出水平均浓度分别为2.4、2.8、3.3和6.5mg·L^-1,TP出水平均浓度分别为0.3、0.4、0.7和0.8mg·L^-1;系统缺氧段反硝化聚磷菌占聚磷菌的比例(DPAOs/PAOs)从76.8%递减到48.8%;HRT为8 h时,通过数理统计方法得出反硝化除磷脱氮比(ΔPO4^3-/ΔNO3^--N)的概率密度高达37.5%,缺氧段ΔPO4^3-/ΔNO3^--N为1.24(理论值1.41),此时反硝化脱氮除磷效果最佳;在整个试验过程中SVI值均低于100 mL·g^-1,而MLVSS/MLSS从0.74逐渐下降到0.63,表明污泥活性逐渐降低.The effect of hydraulic retention time(HRT)on denitrifying phosphorus and nitrogen removal in a modified two sludge A2/O-BAF system was studied.The influent COD,NH4^+-N,and TP were 189.6,60.4,and 5.1 mg·L^-1,respectively.When HRT was 9,8,7,and 6 h,the average effluent COD was less than 42 mg·L^-1.The average effluent NH4^+-N levels were 2.4,2.8,3.3,and 6.5 mg·L^-1,respectively.The average effluent TP values were 0.3,0.4,0.7,and 0.8 mg·L^-1,respectively.The ratio of the denitrifying phosphorus accumulation organisms(DPAOs/PAOs)in the system of anoxic zone was reduced from 76.8%to 48.8%.When HRT was 8 h,the ratio of denitrifying phosphorus to nitrogen(ΔPO4^3-/ΔNO3^--N)was increased by 37.5%by a mathematical statistics method.TheΔPO4^3-/ΔNO3^--N in the anoxic zone was 1.24(the theoretical value is 1.41).At this time,the effect of denitrifying phosphorus to nitrogen was the best.The SVI value was lower than 100 mL·g^-1 throughout the experiment,and the MLVSS/MLSS gradually decreased from 0.74 to 0.63,indicating that the sludge activity was reduced.

关 键 词：水力停留时间(HRT) 反硝化除磷概率密度 ΔPO3-4/ΔNO-3-N 污泥活性 COD物料守恒 

分 类 号：X703.1[环境科学与工程—环境工程]