粉末活性炭强化混凝处理含氨氮微污染水

http://rmzj．pearlwater．gov．cndoi:10.3969/j.issn.1001-9235.2015.05.026第36卷第5期人民珠江2015年10月PEAＲLＲIVEＲ任毅．粉末活性炭强化混凝处理含氨氮微污染水［J］．人民珠江，2015，36(5):106－108．粉末活性炭强化混凝处理含氨氮微污染水任毅(中水珠江规划勘测设计有限公司，广东广州510610)摘要:以PAC为主混凝剂，粉末活性炭为助凝剂，对含氨氮微污染的珠江广州某河段原水进行混凝沉降试验。结果表明单独投加PAC，浊度去除率最高可达90%，氨氮去除率不足20%;单独投加粉末活性炭，氨氮去除率可达40%，浊度去除率不足15%;PAC与粉末活性炭同时投加，浊度去除率可达90%，氨氮去除率提升至45%;粉末活性炭适宜在主混凝剂PAC之前投加，投加时间点靠前，助凝效果相对最佳;偏酸性环境有利于氨氮去除，中性与碱性条件下对浊度去除效果好，当pH=5时，氨氮去除率可达62%，当pH=10时，剩余浊度去除率可达95%。关键词:粉末活性炭;强化混凝;助凝;微污染;氨氮中图分类号:X131．2文献标识码:B文章编号:1001-9235(2015)05-0106-03PowderedActivatedCarbonasEnhancedCoagulationinTreatmentofMicro－pollutionＲawWaterContainingAmmoniaNitrogenＲENYi(ChinaWaterＲesourcesPearlＲiverPlanning，SurveyingandDesigningCo．Ltd，Guangzhou510610，China)Abstract:PACasthemaincoagulantandpowderedactivatedcarbonascoagulantaidareaddedintoaGuangzhouriversectionofthePearlＲivercontainingmicro－pollutionammoniatoexploretheflocculationeffects，efficiencyandcharacteristicsofsettlement．There-sultsshowthat:(1)whenPACisusedalone，theturbidityremovalrateisupto90%andtheammoniaremovalefficiencyislessthan20%;(2)theammoniaremovalrateisupto40%andtheturbidityremovalrateislessthan15%whenpowderedactivatedcarbonisusedalone;(3)Theammonianitrogenremovalrateisimprovedto45%，settledwaterturbidityremovalrateisupto90%whenPACisusedtogetherwithpowderedactivatedcarbonunderconventionalconditions;(4)Coagulationaideffectisbetterwhenthepowderedactivatedcarbonisadded10minbeforethePAC．(5)Byaddingpowderedactivatedcarbonascoagulationaid，theweakacidityenviron-mentisconducivetotheremovalrateofammoniaandtheremovalrateofammoniacanbeimprovedto62%whenthepHvalueisad-justedto5．Alowremainingturbidityisobtainedatneutralandalkalineconditionsandtheremainingturbiditycanbeupto95%whenthepHvalueisadjustedto10．Keywords:PowderedActivatedCarbon;EnhancedCoagulation;Aid－coagulation;Micro－pollution;AmmoniaNitrogen收稿日期:2015-05-10作者简介:任毅，男，湖南长沙人，主要从事给水处理、雨洪控制理论及技术研究等工作。当前，我国大部分饮用水源已经受到不同程度的污染。溶解性杂质如氨氮、有机物等微污染物，已经不是现有常规处理工艺所能去除，显著增加了水处理的难度和成本［1－2］。2006年国家卫生部颁布了新的GB5749—2