化学除磷中混凝剂对活性污泥活性的影响

化学除磷中混凝剂对活性污泥活性的影响*陈亚松(北京建工环境发展有限责任公司，北京100192)摘要:从污水处理厂运行实践出发，研究了混凝剂对活性污泥活性的直接和间接影响。结果表明:混凝剂对微生物的影响程度:PAC＞三价铝盐＞三价铁盐，混凝剂用于生化段除磷时，铁盐投加量宜小于20mg/L，PAC、三价铝盐宜小于10mg/L。反冲洗污水排入生化系统对微生物无直接的抑制作用，但造成活性污泥中的无机组分比例增加，北区厂VSS/SS由深度处理前的0.65降低至0.54。关键词:化学除磷;混凝剂;耗氧速率;活性污泥;反冲洗污水THEEFFECTONACTIVATEDSLUDGEACTIVITYOFCOAGULANTSAPPLIEDINCHEMICALPHOSPHORUSREMOVALChenYasong(BCEGEnvironmentDevelopmentCo．，Ltd，Beijing100192)Abstract:CombinedwiththepracticalexperienceofWWTP，theeffectdegreeonmicroorganismofcoagulantsisstudiedandtheresultsshowthatPAC＞Al3+＞Fe3+．Whilecoagulantsareappliedinchemicalphosphorusremovalinthebiologicaltreatmentstage，theappropriatedosingproportionofFe3+islessthan20mg/L，comparedto10mg/LofPACandAl3+．Thewastewaterfrombackwashbyfiltersdischargedintobiologicalsystemscannotinhibitactivityofmicroorganism，butitresultsinanincreaseofinorganiccomponentsinactivesludge．WithNorthWWTPasexample，theVSS/SSratioreducedto0.54from0.65aftercoagulantsapplication．Keywords:chemicalphosphorusremoval;coagulants;oxygenu