不同条件下低温低浊水混凝试验研究

不同条件下低温低浊水混凝试验研究赵欣1，刘江1，杨鹏2，徐慧2(1．宁东水务有限责任公司，宁夏银川640100;2．中国科学院生态环境研究中心环境水质学国家重点实验室，北京100085)为了保证饮用水水质并实现节能降耗，宁夏宁东水厂采用调节原水pH值，投加高锰酸钾的方式来强化常规处理工艺。结果表明，调节pH值对于处理偏碱性的低温低浊水具有良好的净化效果。当原水pH值调节为中性时，混凝效果达到最优;适当使用聚丙烯酰胺可以优化混凝效果，但由于聚丙烯酰胺具有毒性，在实际运行中要慎重使用;高锰酸钾预氧化可有效提高低温低浊水的处理效果，对于提高冬季低温低浊水处理效果具有重要影响;通过滤池反冲洗水回流的方法，可以提高原水中颗粒物的数量，有助于提高水处理过程中颗粒碰撞效率，改善混凝效果。低温低浊;预氧化;预吸附;反冲洗水回流TU991．33A1673－9353201306－0006－04doi10．3969/j．issn．1673－9353．2013．06．002TreatmentoflowtemperatureandturbiditywaterunderdifferentcoagulationconditionsZhaoXin1LiuJiang1YangPeng2XuHui21．NingdongWaterCo．Ltd．Yinchuan640100China2．StateKeyLaboratoryofEnvironmentalAquaticChemistryＲesearchCenterforEco-EnvironmentalSciencesChineseAcademyofSciencesBeijing100085ChinaAbstractInordertoensurethequalityofdrinkingwaterandrealizeenergysavingtheadjustmentofrawwaterpHvalueaddingpotassiumpermanganatewereappliedtoenhanceconventionaltreatmentprocessinNingdongWaterworks．TheresultsshowedthatadjustmentofpHcouldincreasethepurificationeffectofalkalinitywaterwithlowtemperatureandlowturbidity．OptimalcoagulationresultscouldbereachedwhenpHwasneutral．AppropriateusageofPAMcouldoptimizecoagulationeffectduringactualoperationPAMshouldbeusedcarefullyduetoitstoxicity．Pre-oxidationofpotassiumpermanganatecouldeffectivelyimprovetreatmenteffectforlowtemperatureandlowturbiditywaterandhadimportantinfluenceonlowtemperatureandlowturbiditywatertreatmentinwinter．Thereturnofbackwashwatercouldincreasethenumberofparticlesinrawwateranditcouldhelptoimprovetheefficiencyofparticlecollisionintreatmentprocessandimprovecoagulationeffect．Keywordslowtemperatureandlowturbiditypre-oxidationpreadsorptionreturnofbackwashwater、。。·6·第7卷第6期2013年12月供水技术WATEＲTECHNOLOGYVol．7No．6Dec．2013、、、。、、、1－7。14～510℃10NTU。pH。、、、。1材料与方法1.1250r/min30s200r/min90s40r/min10min30min2cm。1.2PHS－3CpHAB204－STOC/DOC。1.31。1Tab．1Ｒawwaterquality/℃/NTUpHUV254/cm－1CODMn/mg·L－1/mg·L－12．0～6．52．12～4．308．1～8．60．041～0．0452．4～2．611．2～13．52结果与讨论2.15PACl、AS、FeCl3、HACCHPAC。8～18mg/L。pH71。1pH74Zeta。。8－10。CODMnUV254。CODMn。CODMn2。CODMn。CODMn11－14。1Fig．1Coagulationeffectusingdifferentcoagulantsunderneutralcondition·7·2013年12月赵欣，等:不同条件下低温低浊水混凝试验研究第7卷第6期2CODFig．2ＲelationshipbetweeninflowCODandoutflowresidualaluminiumHPACHACC16mg/LFeCl3。。2.2PAMPAM。pHpH8．6。PAM0．10．20．40．81mg/L。PAMHPAC30sPAM3。3PAMFig．3InfluenceofdifferentdosageofPAMoncoagulationeffectPAMPAMHACC。3。PAM0．8mg/L、CODMnUV25425．1%62．5%50．12%。2.33、4PACl16mg/L4。4Fig．4Influenceofreturnofbackwashwateroncoagulationeffect4。1．2%CODMnUV25462．5%50．3%。。3水厂实际运行效果201357—2035。5Fig．5Operationaleffectsunderdifferentcoagulationconditions·8·第7卷第6期供水技术2013年12月5。4结论与建议①HPACHPACFeCl35。②pHpH。1．J．20071311－13．2．J．200928369－72．3．－－－J．2006321251－53．4GuanXHChenGHShangCL．ＲeuseofwatertreatmentworkssludgetoenhanceparticulatepollutantremovalfromsewageJ．WaterＲes200539153433－3440．5GottfriedADShepardKHWalshMEetal．Impactofrecyclingfilterbackwashwateronorganicremovalincoagulation-sedimentationprocessJ．WaterＲes200842184683－4691．6．J．201326528－31．7BourgeoisJCWalshMEGagnonGA．ComparisonofprocessoptionsfortreatmentofwatertreatmentresidualstreamsJ．JournalofEnvironmentalEngineeringandScience200436477－484．8SunYKXiongXMZhouGMetal．Ｒemovalofarsenatefromwaterbycoagulationwithinsituformedversuspre-formedFeⅢJ．SepPurifTechnol201311530198－204．9BordoloiSNathSKGogoiSetal．Arsenicandironremovalfromgroundwaterbyoxidation-coagulationatoptimizedpHLaboratoryandfieldstudiesJ．JHazardMater2013260618－626．10TubiAAgbabaJDalmacijaBetal．InsightintochangesduringcoagulationinNOMreactivityfortrihalomethanesandhaloaceticacidsformationJ．JEnvironManage2013118153－160．11HuangJYangZHZengGMetal．InfluenceofcompositeflocculantofPACandMEFGA1onresidualaluminumspeciesdistributionJ．ChemEngJ2012191269－277．12YangZLGAOBYWangYetal．FractionationofresidualAlinnaturalwatertreatmentfromreservoirwithpoly-aluminum-silicate-chloridePASiCeffectofOH/AlSi/AlmolarratiosandinitialpHJ．JournalofEnvironmentalSciences201224111908－1916．13YangZLGaoBXuWetal．EffectofOH/Al3+andSi/AlmolarratiosonthecoagulationperformanceandresidualAlspeciationduringsurfacewatertreatmentwithpoly-aluminum-silicate-chloridePASiCJ．JHazardMater20111891－2203－210．14YangZLGaoBYYueQYetal．EffectofpHonthecoagulationperformanceofAl-basedcoagulantsandresidualaluminumspeciationduringthetreatmentofhumicacid-kaoinsyntheticwaterJ．JHazardMater20101781－3596－603．1961－。[e-mail]2013－09－30·9·2013年12月赵欣，等:不同条件下低温低浊水混凝试验研究第7卷第6期