Mg2助凝PAC对城市二沉池出水的作用及机理研究王喆

、、[1-2]。PAC、、[3-5]N、PPAC[6-7]。Mg2+。Mg2+PAC。11.1COD47.20～80.32mg/LpH7.0～8.21.5～5.35NTUPO43--P、NH4+-N3.49±0.7、5.21±0.5mg/L。MgCl2·6H2Ow≥98.0、KMnO4w≥99.5%、PACw(Al2O3)≥29.0%。Mg2+、KMnO4PACMg2+0.042mol/LKMnO40.006mol/LPAC0.020mol/L。1.21000mL1000mL23±2℃。。15min20min1.3HACH2100QpHWTW-pHPO43--P1231212121.3003842.3003843.300041、。1Mg2+PAC、10%2Mg2+3Mg2+PAC1.95NTU0.25NTUPO43--P4.1mg/L0.28mg/LP87.2%93.2%。。TQ424X703.1A1000-3770(2018)[e-mail]:10.16796/j.cnki.1000-3770.2018.02.02444220182Vol.44No.2Feb.,2018100NH4+-NZetaZeta。22.1Mg2+PAC。Mg2+。PACMgCl20.8mg/LMg2+NH4+-N、PO43--P、1。PACMg2+、10%、。1bZeta0PO43--P、NH4+-N。Mg2+、。1bPAC6mg/LMg2+PAC6～8mg/LMg2+PAC8mg/LMg2+。。。2.2Mg2+。[8-9]。、、[10-11]。2Mg2+、ρ(PO43-)/(mg·L-1)246810120.00.51.01.52.02.53.03.5
/(mgL)PACFeCl PO2030405060708090100PACFeCl/%2a2b2P、Fig.2N,P,andturbidityremovalrateandresidualconcentrationunderdifferentflocculantdosage246810121020304050607080
/(mgL) /%PACFeCl2468100.00.51.01.52.02.5PAC
/(mgL)/NTU-6-5-4-3-2-10PACPAC+MgZetaZeta1b1Mg2+N、P、Fig.1N,PandturbidityremovalrateandresidualconcentrationunderdifferentMg2+conditions2468100.00.51.01.52.02.53.0PAC
/(mgL)PO-PPACPAC+Mg02468NH-NPACPAC+Mgρ(PO43--P)/(mg·L-1)ρ(NH4+-N)/(mg·L-1)1aMg2+PAC101、。Mg2+PAC、FeCl3PO43--PPACFeCl3PAC35.4%88.5%FeCl332.7%76.5%2bPACFeCl36mg/L6mg/L。PACAl13300～500μm。PACMg2+、、。2.35Mg2+。a+MgCl2b+PACc+PAC2min+MgCl2d+MgCl22min+PACe+[MgCl2+PAC]。2.3.11ecdbaaMg2+3%Mg2+bPACc、d、eMg2+Mg2+PAC。PO43--PebdcaPACPAC76.4%aMg2+5%b、c、d、eMg2+PO43-PACPO43--PMg2+PACPO43--P83.6%。eNH4+-N、PO43--P。2.3.22CODedbca。PAC25.9%Mg2+PAC32.3%COD。1、2Mg2+、PAC。edcba。aMg2+Mg2+Mg2+Zeta。2Zetac、e0。eCOD、1eMg2+PAC。ρ(NH4+)/(mg·L-1)/%ρ(PO43-)/(mg·L-1)/%abcde7.835.843.415.592.788.088.088.088.088.083.127.757.830.865.61.330.330.340.340.231.41.41.41.41.4576.475.775.783.61N、PTab.1N,P,andturbidityremovalrateandresidualconcentrationunderdifferentchemicalreagentsaddingmodesCOD/(mg·L-1)/%/NTUZetaabcde45.6835.2137.2634.132.1647.5247.5247.5247.5247.523.925.921.628.232.31.271.180.790.830.55-11.4-14.8-5.52-11.7-2.322COD、ZetaTab.2CODandturbidityremovalrateandZetapotentialchangeunderdifferentchemicalreagentsaddingmodes4421022.4Mg2+PAC2.4.13、、、、。70mm2.5m。。30m/h5NTU30m/h。。445m/h。2.4.2--、、、、[12-14]。。5、PO43--P。1.95NTU0.25～0.54NTU83.6%±4.2%。。PO43--P4.1mg/L0.28～0.81mg/L。PO43--P79.47%～93.58%。PACPO43--P。PACMg2+PAC。3Mg2+PACMg2+。1Mg2+、NH4+-NPO43--P。2。Mg2+PAC。3Mg2+
 3Fig.3Experimentalfacilitydiagramofhigh-ratefiltration02468101214161820304050607080
/(mh)/h4Fig.4Changeoffilteringvelocitywithfiltrationtimeρ(PO43--P)/(mg·L-1)5、PFig.5TurbidityandPremovalrateandresidualconcentrationinhigh-ratefiltrationexperiment024681012141618200.00.51.01.52.02.53.03.54.04.5
/h0102030405060708090100012345/%/NTUMg2+PAC103StudyontheEffectandMechanismofPACwithMg2+CoagulationonMunicipalSecondaryTankEffluentWANGZhe1,2,3,SUNLiping1,2,FUChuanqi1,2,FANGYuxiang1,2(1.SchoolofEnvironmentandMunicipalEngineering,TianjinChengjianUniversity,300384;2.TianjinKeyLaboratoryofAquaticScienceandTechnology,300384;3.BoTianenvironmentgroupLimitedbyShareLtdofTianjin,300041:Tianjin,China)Abstract:Secondaryeffluentfrommunicipalwastewatertreatmentplantwasusedasresearchobject,bycomparingtheeffectofaluminumandironflocculantswithmagnesiumsaltcoagulationonwaterremovalefficiencytoensuretheoptimalmixproportionofchemicalreagentsandaddingorder.Andtheremovalefficiencyofsecondaryeffluentwithmicroflocculationandhighfiltrationunderoptimalconditionswasstudied.Theresultsshowedthat,theadditionofMg2+increasedtheremovalefficiencyofnitrogenandphosphorusbyPAC,andtheremovalratewasincreasedbyabout10%.AndtheeffectofMg2+onaluminumcoagulantwasbetterthanthatofiron.ThegoodresultswereobtainedbythehighspeedfiltrationofrawwaterwascarriedoutwiththeadditionofMg2+andPACatthesametime(turbidityreducedfrom1.95NTUto0.25NTU,Preducedfrom4.1mg/Lto0.28mg/L,removalrateofturbidityandPO43--Pwas87.2%and93.2%respectively).Withrespecttothebasisofreducingthedosageoftheagent,itprovideddatareferenceandstrengtheningcontrolconclusionforthedeepremovalofnitrogenandphosphorusinthemunicipalwastewatertreatmentplant.Keywords:magnesiumsalt;coagulation;polymericaluminumchloride;high-speedfiltration、PO43--P79.4%～87.8%、79.5%～93.6%。[1],,,.[J].,2009,30(4):1099-1104.[2],,,.[J].,2010,30(5):897-907.[3],,.[J].,2004,23(3):306-309.[4]MAOYuhong,CHANGQing,ZENGLiyun.VelocityfieldstructureandflocculationefficiencyinTaylor-Couetteflow[J].SeparationScienceandTechnology,2013,48(4):659-663.[5],,,.S-K-[J].,2014,8(2):471-476.[6],,,.[J].,2010(06):1542-1547.[7]WANGYanZHANGFengCHUYongbao,etal.Thedyeorhumicacidwatertreatmentandmembranefoulingbypolyaluminumchloridecompositedwithsodiumalginateincoagulation-ultrafiltrationprocess[J].WaterScienceandTechnology,2013,67(10):2202-2209.[8],,,.、[J].,2010(05):80-83.[9],,,.,,2014,8(7)177-181.[10],,,.-[J].,2003(01):98-102.[11],,.Fenton-[J].,2014(08):1327-1331.[12].[D].:,200