城市污水处理厂化学强化生物除磷的试验研究李子富

2014,34(12)3070~3077ChinaEnvironmentalScience1*,1,2,1(1.,1000832.,101400),(A2O),.,(PAC)(PFS)(FeCl3),.:3,PAC,60mg/L,β4.15,0.5mg/L,,0.078/t.,PAC.,PAC60mg/L,β4.22,0.5mg/L,.,,,,,.X703.1A10006923(2014)12307008Experimentalstudyonchemicallyenhancedbiologicalphosphorusremovalformunicipalwastewatertreatmentplant.LIZi-fu1*,YUNYu-pan1,ZENGHao2,ZHOUXiao-qin1(1.SchoolofCivilandEnvironmentalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China2.HuairouDistrictofBeijingEnvironmentalProtectionBureau,Beijing101400,China).ChinaEnvironmentalScience,2014,34(12)3070~3077AbstractInordertodealwiththeproblemthatthehightotalphosphorus(TP)concentrationofeffluentfromonemunicipalwastewatertreatmentplantinBeijing,usingthebiologicalprocess(A2O)followedwithchemicalphosphorusremovalprocess,laboratorytestsandtechnicalscaleexperimentswereconductedinorder.TheaerobictankeffluentwassampledforevaluatingthephosphorusremovalefficiencyofPAC,PFS,FeCl3respectively,andthephosphorusremovalmechanismsofthethreereagentswerefurtherdiscussed.PhosphorusremovalefficiencyofPACwasthebestamongthreecoagulants.TheTPconcentrationofeffluentcouldbelowerthan0.5mg/Landthecoagulantcostwas0.078Yuan/twiththedosageof60mg/Landthecoefficientβof4.15.Theaerobictankoutletwasselectedtobethedosingpositionforthetechnicalscaleexperiments.ResultsshowedthatdemandinphosphorusremovalefficiencycouldbemetwithaPACdosageof60mg/Landcoefficientβof4.15.Consideringthewaterqualityandloadingfluctuation,inordertoensureTPconcentrationofeffluentdischargedlowerthan0.5mg/L,adetailedoptimizationschemewasproposed,throughtakingeffectivemeasuresofimprovingthebiologicalphosphorusremovalanddosingthecoagulantswithfeedbackcontrolmethodstodecreasethedosageamountofPAC,thereforereducedtheoperationcostandchemicalsludgeamount.Keywordswastewatertreatmentchemicallyenhancedbiologicalphosphorusremovalcoagulantdosage,.,.,[1].,BODCOD/TPDONO3[2],;,.,(TP0.5mg/L),.,20140331*,,[e-mail]123071[3].,,0.2mg/L[4].,,,[5].[6],,.,.[7],;[8],JYF;Clark[9].,,,.,,,.11.13.5t/d,.,MBR,A2O+MBR(1).,.,A(TP0.5mg/L).,,,,,,,1.129874563101Fig.1Theprocessflowchartofthemunicipalwastewatertreatmentplant1.;2.;3.;4.;5.;6.MBR;7.;8.;9.;10.1Table1waterpropertiesoftheinfluentandeffluentCOD(mg/L)BOD(mg/L)TN(mg/L)TP(mg/L)NH3N(mg/L)pH70004005010307~8501015217~81.2:ZR46pH.:(Fe38%,0.5g/mL)(Fe11%,1.45g/mL)(Al2O310%,1.28g/mL).1.31.3.1:10,20,30,40,50,60,70mg/L.1L(,TP1~3.5mg/L),.,ZR46.22min200r/minG37.6~38.0/s15min,50r/min,G5.8~6.0/s[10].30723430min,.,,,.1.3.2.:[11].,,,,,,;,,.,,,,,,,,,MBR,,.,,,,15~20min[12].,,.,.1.3.3.TP,pHpH.,,100%,OH,.,,[13].β=MeTPnn:β;nMe,mol;nTPTP,mol.,.22.1,,3.18mg/L.234.2PFSTable2PhosphorusremovalresultsofPFS(mg/L)βTP(mg/L)pH102.552.327.94203.631.977.82304.221.627.79404.751.347.81504.990.997.65605.30.707.59705.680.487.47:TP10080604020010203040506070(mg/L)TP(%)2PFSFig.2PhosphorusremovalefficiencyofPFS,FeCl3PFSPAC,0.5mg/L.,PAC,60mg/L,FeCl3PFS,70mg/L.β,31(,β1),,,PAC4.15,FeCl3PFSβ1230735.684.78.,.3FeCl3Table3PhosphorusremovalresultsofFeCl3(mg/L)βTP(mg/L)pH101.892.197.94202.791.847.81303.261.467.72403.611.107.69503.960.837.53604.240.547.46704.780.467.31:TP10080604020010203040506070(mg/L)TP(%)3FeCl3Fig.3PhosphorusremovalefficiencyofFeCl34PACTable4PhosphorusremovalefficiencyofPAC(mg/L)βTP(mg/L)pH101.632.047.94202.301.567.87302.711.117.81403.120.837.76503.860.617.65604.150.427.67704.640.387.51:TPPAC60mg/L86%0.42mg/L,0.5mg/L,PFS70mg/L,83%78%0.46,0.48mg/L,0.5mg/L..5PAC0.078/t,PFS0.084/t0.112/t.10080604020010203040506070(mg/L)TP(%)4PACFig.4PhosphorusremovalefficiencyofPAC0.120.100.080.040.020PACPFS(mg/L)0.06(/t)807060505,Fig.5Thecostofthreereagentsundertheconditionofoptimaldosage,[14]Fe3+PO43(FePO4).,,,,Fe2(OH)24+Fe3(OH)45+Fe5(OH)96+Fe5(OH)87+Fe6(OH)126+Fe7(OH)129Fe7(OH)1110+Fe9(OH)207+Fe12(OH)342+..[15],:[Fe(PO4)x(OH)3x];307434;,.,Al3+PO43;,Al3+Al(OH)2+Al(OH)2+AlO2,,Aln(OH)m(3nm)+(n1,m3n),,.,,,[16],[17].pH.,pH8,,,,Fe3+PO43,FePO4Fe(OH)3,PO43,,[18](pH),().,OH,,,,[19],,OH,.,PFS,.,,,,,[20].,().(PAC),(A113)[21].PAC,Al3+PO43.pH7~8,,,,,,,,,.,,:;.,,.:3,PAC,,,,60mg/L,,0.078/t.,,PAC.[22],(Al2O328%)(Fe20.64%)(Fe20.64%).,TP1.735mg/L,(GB38382002)(TP0.2mg/L),PACFeCl3PFS40,20,25mg/L.,,,,.,,.2.2PAC,,PAC50,60,70mg/L.1230752.94mg/L,pH7.92.5.5Table5Resultsoftechnicalscaleexperiments(mg/L)βTP(mg/L)pH503.820.497.76604.220.357.64704.710.297.56:TP100806040200TP(%)506070(mg/L)6PACFig.6PhosphorusremovalefficiencyofPAC2.2.1PAC,PAC60mg/L,88%,0.35mg/L,0.5mg/L.50mg/L,0.5mg/L,0.49mg/L,,,.,60mg/L,0.078/t.2.2.2PACpH.PAC,,pHPAC,,pH7~8.5,PAC60mg/L,pH7.64,..DeHass[23],Fe3+Al3+VSSISS,ISS.,,[24].,PAC,11%~17%,.MBR.,.Clark[25],Fe3+pH[26];Philips[27].,PAC,,,.,MBR.MBR.MBR.MBRPAC,,MBR[28],MBR.MBR,,.,,(CODNH4+NSS)A.,.2.3,(),,.,,,,,,,,:(),307634,.COD/TP,,.BOD5/TP20,[29].,,,,.DO.DO.,DO.DODO,,.,DO,DO1.5~2.5mg/L,DO0.2mg/L,DO0.5mg/L.,.G(),.,,.,10~30s2min;GGT,T.,.,(),,.(),,,,,,,.,.,[30],,COD,,,MBRCOD,,,.,,,,,.7.,,,,,.123456CODPP7Fig.7Automaticcontroltheoryofphosphorusremovalbychemicalprecipitation1.;2.A2O;3.MBR;4.;5.;6.33.1,PACFeCl3PFS3:PAC,.60mg/L,4.1