混凝—气浮—过滤深度处理A2O工艺二沉池出水  

Advanced Treatment of Effluent from Secondary Sedimentation Tank of A2O Process by Coagulation-Dissolved Air Flotation-Filtration

作　　者：杨墨 刘毛 邓涛 王旭峰 杨开[5] 马放 YANG Mo;LIU Mao;DENG Tao;WANG Xu-feng;YANG Kai;MA Fang(School of Environment,Harbin Institute of Technology,Harbin 150001,China;Central and Southern China Municipal Engineering Design and Research Institute Co.Ltd.,Wuhan 430010,China;Zhuhai Institute of Urban Planning&Design,Zhuhai 519099,China;Wuhan Municipal Engineering Design&Research Institute Co.Ltd.,Wuhan 430023,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]哈尔滨工业大学环境学院,黑龙江哈尔滨150001 [2]中国市政工程中南设计研究总院有限公司,湖北武汉430010 [3]珠海市规划设计研究院,广东珠海519099 [4]武汉市政工程设计研究院有限责任公司,湖北武汉430023 [5]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《中国给水排水》2020年第19期89-94,共6页China Water & Wastewater

摘　　要：以武汉市某污水处理厂A2O工艺二沉池出水为原水,进行了混凝—气浮—过滤深度处理工艺中试研究。结果表明:①在表面负荷为8~12 m3/(m2·h)条件下,该深度处理工艺出水COD为17 mg/L、浊度<0.5 NTU、TP<0.1 mg/L;②表面负荷对出水水质的影响不大,当分流比为15%、混凝剂(聚合硫酸铝铁)投加量为10 mg/L时,处理效果最优,对浊度、COD、TP的去除率分别为94%、63%和90%;③当分流比较小(10%)时,增加混凝剂用量可以降低出水浊度与COD,当分流比较大(20%)时,混凝剂用量不再是限制因素,对出水浊度和COD影响不大;④混凝—气浮工艺可去除大部分悬浮物、COD和TP,保证了更好的过滤效果与较长的过滤周期。混凝—气浮—过滤工艺的处理效果优于污水处理厂既有高密度沉淀池+精密过滤器深度处理工艺。A pilot study on advanced treatment process of coagulation-dissolved air flotation(DAF)-filtration was carried out in a wastewater treatment plant in Wuhan,and its influent was secondary sedimentation tank effluent of an A2O process.When surface load was 8-12 m3/(m2·h),COD in the effluent of the advanced process was 17 mg/L,turbidity and TP in the effluent of the advanced process were less than 0.5 NTU and 0.1 mg/L.Surface load had little effect on effluent quality.The optimum operational condition was obtained when the recycling ratio was 15%and the dosage of coagulant(polymeric aluminum ferric sulfate)was 10 mg/L,and removal rates of turbidity,COD and TP were 94%,63%and 90%,respectively.When recycling ratio was relatively small(10%),increasing coagulant dosage could reduce turbidity and COD in the effluent.When recycling ratio was large(20%),the coagulant dosage was no longer a limiting factor,and it had little impact on turbidity and COD in the effluent.In this process,coagulation-DAF process removed most of the suspended solids,turbidity and COD,in which good filtration efficiency and longer filtration cycle were obtained.This process achieved better treatment efficiency than the existing advanced treatment process of high-density sedimentation tank and precision filter.

关 键 词：二沉池出水 A2O工艺 深度处理 混凝 气浮 过滤 分流比 投药量 

分 类 号：TU992[建筑科学—市政工程]