高密度澄清器在初期雨水处理中的应用研究
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2020-04-09 22:29:08
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INDUSTRIALWATER&WASTEWATER工业用水与废水Vo1.43No.6Dec..20125施工、设备与材料2高密度澄清器在初期雨水处理中的应用研究吴亚男,黄显怀,乔建生(安徽建筑工业学院环境与能源工程学院,合肥230022)摘要:采用高密度澄清器处理初期雨水.以减轻其对南淝河水体的污染通过改变高密度澄清器的进水流量、加药量以及运行条件.确定本工艺的最佳流量以及不同降雨污染负荷对应的最佳投药量.并保证工艺能在尽量减少药剂成本的状况下运行..在流量为60m3/h的条件下,SS去除率最高可达91.6%,COD去除率最高达63.8%,出水水质良好;对于进水SS、COD。的质量浓度分别在200~350、150~300mL的小雨,取PAC、PAM的投加量分别约为20、1.2mg/L对于进水SS、COD的质量浓度分别在600900、300~600ing/L的大雨,取PAC、PAM的投加量分别约为30、1~2Illg/L,可以经济有效地达到最佳去除率:运行一段时间后,开启污泥回流系统,并将加药量降低到原加药量的50%~60%.这样既可降低污水处理成本.又能有效去除污染物关键词:高密度澄清器:降雨类型:加药量:污泥回流中图分类号:X703.3文献标识码:A文章编号:1009—2455(2012)06—0068—05ApplicationofdensadegininitialrainwatertreatmentWUYa—nan.HUANGXian—huai.QIAOJian—sheng(SchoolofEnvironmentandEnergyEngineering,AnhuiUniversityofArchitecture,Hefei230022,China)Abstract:ForthepurposeofreducingthepollutionofNanfeiRivercausedbyinitialrainwater,densadegwasusedtotreattheinitialrainwater.Throughchangingtheinfluentflowrate,chemicaldosageandoperationcondition,theoptimalflowrateofthesaidprocessandtheproperdosageofchemicalcorrespondingtodifferentpollutionloadsofrainwaterweredetermined,whichensurednormaloperationofthesaidprocesswithminimalcostofchemica1.Whentheflowrateoftheinfluentwaterwas60m/h,themaximalremovalratesofSSandCODcrreached91.6%and63.8%respectively.theefluentwaterqualitywasgood;fortherainwaterwithinfluentSSandCODc~concentrationsof200—350and150—300mg/Lrespectively,theoptimaldosageofPACandPAMwere20and1.2mg/Lrespectively.FortherainwaterwithinfluentSSandCODcrconcentrationsof600—900and300—600mg/Lrespectively,theoptimaldosageofPACandPAMwere30and1—2mg/Lrespectively.Withtheproperdosageofchemical,thehighestremovalratesofpollutantscouldbeobtainedeconomicallyandeffectively.Afteraperiodofoperation,thesludgerecirculationsystemstartedtowork,andthen,thechemicaldosagewasreducedto50—60percentthatoftheinitialdosage,SOastocutdownthecostofsewagetreatmentandmaintainhighpollutantsremovalratesatthesametime.Keywords:densadeg;rainfalltypes;chemicaldosage;sludgerecirculation南淝河是合肥重要的河道之一。南淝河上游雨污混接系统污染严重,其中以清I、II冲沟流域最为突出,
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