城镇污水处理厂尾水深度化学除磷试验研究

2007GB18918－2002A[1]。。。COD/TP、BOD、DOTPGB18918－2002Bρ(TP)≤1mg·L-1Aρ(TP)≤0.5mg·L-1[2]。。。。。TP。1、1870。。2080。1TP75%[3]OsloWestBOD590%[4]。[5]。4、、。3、[6]。、、、、、、AVR。pKa1[7]。112111.3100322.313300A/O。PFSPACPFSPAC15mg·L-1TP0.5mg·L-1PFSn(Fe3+)/n(P)1.25、PAMPAC。、。X703.1A1000-3770(2011)06-0050-0042010-03-291958－、[e-mail]37620116TECHNOLOGYOFWATERTREATMENTVol.37No.6Jun.,201150PO43-、[8]。4、、[9]。22.1A/O2。。2.2PACAl2O3≥29%PFSFe3+≥22%。Al2(SO4)3·18H2OFeSO4·7H2OFeCl3·6H2OAR。PAM90%±0.5%PAM10%±0.5%。2.3TPρ(TP)=33.21A-0.1377AR2=0.9994[10]。2.45PAC、、PFS、。5g·L-1。1L2L1r·min-110r·min-13min20min2cmTP。33.145、10、15mg·L-1200、300、400r·min-1、40、60、80r·min-1、pH6、7、83L9(34)3。4。43。PACPFSPFSPAC。TP1.63mg·L-1TP≤0.5mg·L-1GB18918－2002A。1pKaTab.1ThereactionequationofphosphatesedimentsformedbyvariousmetalionsandpKapKaFe3++PO43-→FePO4↓3Fe2++2PO43-→Fe3(PO4)2↓Al3++PO43-→AlPO4↓Ca2++2H2PO4-→Ca(H2PO4)2↓Ca2++HPO42-→CaHPO4↓10Ca2++6PO43-+2OH-→Ca10(OH)2(PO4)6↓23302116906.93～7.217～1925～580.9～3.35～152Tab.2WaterqualitypHρ(SS)/mg·L-1COD/mg·L-1ρ(TP)/mg·L-1/(°)3L9(34)Tab.3L9(34)orthogonalexperimentdesign/mg·L-1123456789555101010151515200300400200300400200300400406080608040804060678867786/r·min-1pHPFS12345678916.8322.7119.3235.6436.0235.3053.6955.8152.9036.479.6611.28.3218.1621.5918.6223.6324.8726.6818.0816.3225.1624.2846.7345.6243.6062.5068.7265.5142.277.3212.6711.6318.6517.5216.2824.9830.5625.6718.3615.6319.2016.2023.6625.9824.6333.7534.5636.5125.574TPTab.4TPremovalrateofvariouscoagulants/%PAC513PFSTPpHFig.3TheundulationsituationofphosphorusremovalratebyPFSalongwithpH345678910020406080100TP
/%pH。。。3.2TP3.2.1TP1.46mg·L-1TP1.46mg·L-1PFS、PAC1。115、20、25、30mg·L-1TP0.5mg·L-125mg·L-1。3.2.2TP2.73mg·L-1TP2.73mg·L-1PFS、PAC2。2TP≤0.5mg·L-1PFSPAC3035mg·L-135mg·L-1。2。PFSn(Fe3+)/n(P)=1.25FeCl3·6H2On(Fe3+)/n(P)=1.96PACn(Al3+)/n(P)=1.82。PFS。3.3pHPFS15mg·L-1TPpH3。3PFSpH5～9pH8。pH21pHFe3+、A13+PFSPAC。pHOH-PFSOH-Fe(OH)3PAC。2pH＜4.6H3PO4pH4.6～9.8H2PO4-HPO42-2[10]。3.4PAMTP2.73mg·L-1PAM。2PAMPFSPAC1520mg·L-12PAM4。4PAMPFSPAMTPPAM1mg·L-111.1%1TP1.46mg·L-1Fig.1ThecoagulantdosagewhentheconcentrationofTPis1.46mg·L-1051015202530350.00.20.40.60.81.01.21.41.6020406080100

/%/mgL

(TP)/mgL2TP2.73mg·L-1Fig.2ThecoagulantdosagewhentheconcentrationofTPis2.73mg·L-105101520253035400.00.51.01.52.02.53.0020406080100

/%/mgL

(TP)/mgL37652PAMPAC1mg·L-15.7%。PAMPAM0.4mg·L-120.8%。3.5PAMTP2.73mg·L-1PAC、、PAM35、40、0.4mg·L-123min5。5PAM3min。4A/OPAMPFS、PACPAMPACPAM3min。PACPFSPFSPAC。PFSn(Fe3+)/n(P)1.25PFS、。PFSpH5～9pH8。TP1.46mg·L-1PFS、PAC15、20、25mg·L-1TP0.5mg·L-1。TP。PFS、PACpH8、7、6PFSpH5～9pH。pH3PFSPAC。、pH、。、pH、、。、。[1]GB18918－2002[S].[2],.[M].:,1998:6-9.[3].[J].,2003,101(5):45-47.[4]Hallvarddegaard.Optimizedparticleseparationintheprimarystepofwastewatertreatment[J].WatSciTech.,1998,37(10):43-53.[5].CEPT[J].,2000,16(1):26-29.[6]JiangJia-Qian,GrahamNigelJD.Pre-polymerizedinorganiccoagulantsandphosphorusremovalbycoagulation-areview[J].EnvironmentalandWaterResourceEngineering,1998,24(3):237-245.[7],.、、[M].:,2004:25-29.[8]TannerCC,SukiasJPS,PsdellMPU.SubstratumPhosphorusaccumulationduringmaturationofGravel-bedconstructedWetlands[J].WatSciTech.,1999,40(3):147-154.[9]BollerM.Nutrientremovalformwastewaterproceedingof7thEuropeanSewageandrefuseSymposium[J].Munich:EWPCA-IFAT,1987:19-22.[10]《》.[M].4.:,2002.4PAMFig.4TheeffectofPAMcoagulantdosageontheremovalofphosphorus
0.00.20.40.60.81.00.00.10.20.30.40.50.60.7
PFS
PACPAMPAM
(TP)/mgLPAM /mgL3minPAC+PAM+PAM0.4790.4190.3490.5595PAMTab.5TheeffectofcoagulationwithdifferenttimesofaddingPAMρ(TP)/mg·L-15853EXPERIMENTALSTUDYONENHANCEDREMOVALOFPHOSPHORUSFROMEFFLUENTSINMUNICIPALWASTEWATERTREATMENTPLANTBYCHEMICALPRECIPITATIONPanLili1,WangLing1,ZhengHaijun2,LuBosheng1,XuWeiyong1(1.CollegeofBiologyandEnvironmentalEngineering,ZhejiangUniversityofTechnology,Hangzhou310032,China;2.EnvironmentalProtectionAgencyofAnjicounty,Anji313300,China)Abstract:TheremovalofPhosphorusbychemicalcoagulationwascarriedoutfortheA/OtreatmentwaterinamunicipalsewagetreatmentplantsituatedintheTaihuLakeBasin.TheresultsshowedthatinorganicmacromoleculescoagulantPFSandPAChadabettereffectonphosphorusremovalcomparedwithotherinorganicmoleculescoagulants.Andphosphorusremovaleffectofiron-basedcoagulantswasbetterthanaluminum-saltcoagulants.Amongthecoagulants,phosphorusremovalefficiencyofPFSwasbest,PACtookthesecondplace.Whenthecoagulantdosagewas15mg·L-1,thetreatedwastewaterTPwaslessthan0.5mg·L-1.PFSandphosphorusmolarratio(asn(Fe3+)/n(P))was1.25.PFSwasanefficientcoagulantwithlowdosageandlowcost.Whencoagulantcombinedwithflocculant,coagulationaidactionofthenon-ionicPAMforPACandferricchloridecoagulantwasobviously.Chemicalphosphorusremovalprocesscanbeasimpleandeffectivemethodtoreducethephosphoruscontentoftheendofthewaterinurbansewagetreatmentplants.Keywords:chemicalphosphorusremoval;advancedphosphorusremovalinurbansewage;phosphorusremovalcoagulants;phosphorusremovalprocessnnnnnnnnnnnnnnnnnnnnnnnnnnn