强化混凝法对乡镇污水处理厂出水总磷和SS的控制  

The Control of TP and SS Dischaged from the Township Wastewater Treatment Plant by Using Enhanced Coagulation

作　　者：倪璟叶 巢少峰 吴颜科[3] 曹吴苏 郑晓英[3] 潘静 冒文娟[3] 

机构地区：[1]常州市武进区水利(务)局,江苏常州213161 [2]江苏大禹水务股份有限公司,江苏常州213161 [3]河海大学环境学院,江苏南京210098

出　　处：《污染防治技术》2014年第1期8-11,20,共5页Pollution Control Technology

基　　金：国家自然科学基金(51208174);水体污染控制与治理科技重大专项(2012ZX07506-002-2)

摘　　要：针对乡镇污水处理厂出水TP和SS不稳定的问题，该研究考察了不同混凝剂（铝铁盐、聚合氯化铝及硫酸铝）对TP和悬浮物SS的去除效果及其影响因素。通过试验探讨了混凝剂投加量、混合液污泥浓度和pH值对混凝效果和污染物去除的影响。结果表明，当pH值为7．1，TIP浓度为3．0±0．2mg／L，好氧池混合液污泥浓度为8000mg／L时，投加40mg／L的聚合氯化铝可实现出水SS和TP同时达到《城镇污水处理厂污染物排放标准》（GB18918—2002）一级A标准。结合该厂的进水水质和运行条件，建议该乡镇污水处理厂好氧池内活性污泥浓度宜控制在5000—6000mg／L之间，可确保系统的生物降解和混凝沉淀均能有效进行，出水TP和SS稳定达标。当工业废水排放导致乡镇污水呈酸性（pH≤5）时，仅通过强化混凝不能实现出水SS达标排放，建议采用铝铁盐并增设过滤装置以实现出水SS和TP达标排放。In order to resolve the unstable removal rates of TP and SS in township wastewater treatment plant, the removal effi- ciencies influenced by different coagulants, including aluminum - ferric salts, poly aluminum chloride （ PAC ） and aluminum sul- phate were investigated. Effects of the dosage of coagulant, mix liquid sludge concentration and pH value on the coagulation efficien- cy and the removal of pollutants were discussed. The results showed that when the coagulant dosage CPAC = 40 mg/L, the outlet ef- fluent could meet the reguirements of 1A discharge standard of ＂ Discharge standard of pollutants for municipal wastewater treatment plant promulgated by the ministry of construction （GB18918 -2002）＂. Based on the feed water quality and operating parameters, when the MLSS of aerobic tank was 5000 to 6000 mg/L, the biodegradation in the aerobic tank and coagulation - sedimentation could effectively operation, and the effluent TP and SS could meet the require nerds of discharge standard. When the township wastewater was acidic （ph≤5） caused by the emissions of industrial wastewater, the outlet effluent TP and SS could not meet the discharge standard requirements only through enhanced coagulation. In order to ensure the effluent TP and SS to meet the require- ments of discharge standard, the coagulant of aluminum - ferric salts should be adopted and the filtration equipment was needed in the township wastewater treatment plant.

关 键 词：乡镇污水 强化混凝 混凝剂 除磷 SS 

分 类 号：X703[环境科学与工程—环境工程]