pH值和纯氧曝气对氨氮去除的影响研究

pH值和纯氧曝气对氨氮去除的影响研究陈丽珠，巢猛，丁卫，刘清华，陈卓华(东莞市东江水务有限公司，广东东莞523112)摘要:针对南方饮用水源水氨氮季节性、突发性污染的特点，在中试条件下，结合水厂传统制水工艺和活性无烟煤滤池联用纯氧曝气，探讨pH值对氨氮去除效果的影响机理，并进行成本核算，重点考察了砂滤池、活性无烟煤滤池、活性无烟煤联用纯氧曝气三组制水工艺在不调节pH值和调节pH值为7．2、7．4、7．6、7．8、8．0、8．2、8．4、8．6条件下氨氮浓度变化及去除量。结果表明，调节pH值后，对氨氮的去除效果提高。在pH值为8．0时，这三组工艺对氨氮的绝对去除量分别为1．23、1．72、3．05mg/L，活性无烟煤联用纯氧曝气对氨氮的去除效果最好。投加NaOH调节pH值，待滤水相对于原水pH值下降，滤后水的pH值进一步降低;投加NaOH调节pH值为8．0，成本约为0．031元/m3水，适用于水厂应对季节性、突发性氨氮污染。关键词:氨氮;pH值;纯氧曝气;活性无烟煤滤池中图分类号:TU991文献标识码:C文章编号:1000－4602(2016)09－0058－04EffectofpHandPureOxygenAerationonAmmoniaNitrogenＲemovalCHENLi-zhu，CHAOMeng，DINGWei，LIUQing-hua，CHENZhuo-hua(DongjiangShuiwuCo．Ltd．，Dongguan523112，China)Abstract:Toaddresstheproblemsofseasonalandsuddenpollutionofammonianitrogeninthesoutherndrinkingwatersource，theeffectofpHvalueonremovalofammonianitrogenwasinvestigated，andthecostaccountingwasperformedbasedonthetraditionalwatertreatmentprocessandactivatedan-thracitefilterwithpureoxygenaeration．Theammonianitrogenconcentrationsandremovalrateswerein-vestigatedwithoutadjustingpHandwithadjustingpHto7．2，7．4，7．6，7．8，8．0，8．2，8．4and8．6forsandfilter，activatedanthracitefilterandactivatedanthracitefilterwithpureoxygenaeration，respec-tively．Theresultsshowedthattheremovalefficiencyofammonianitrogencouldbeimprovedafteradjus-tingpH．WhenpHwas8．0，theremovalratesofammonianitrogenbythethreegroupsofprocesseswere1．23mg/L，1．72mg/Land3．05mg/Lrespectively．Thebestremovalefficiencywasachievedbythegroupofactivatedanthracitefilterwithpureoxygenaeration．ThepHofthewatertobefilteredde-creased，andthepHofthefilteredwaterdecreasedfurtherwhenpHwasadjustedwithadditionofNaOH．ThecostofNaOHforadjustingpHto8．0wasabout0．031yuan/m3．Itwasapplicabletowatertreatmentplantstorespondtoseasonalandsuddenpollutionofammonianitrogen．Keywords:ammonianitrogen;pHvalue;pureoxygenaeration;activatedanthracitefilter基金项目:国家水体污染控制与治理科技重大专项(2009ZX07423－003)氨氮是微污染水源中较普遍的一类污染物，季节性和突发性氨氮污染会影响水厂工艺运行。给水·85·第32卷第9期2016年5月中国给水排水CHINAWATEＲ＆WASTEWATEＲVol．32No．9May2016处理工艺中若氨氮去除不彻底会引起各种问题。当管网系统中氨氮浓度高时硝化细菌会生长繁殖，造成