低温下MBBR处理低碳氮质量比生活污水的同步硝化反硝化特性汪传新

458()Vol.45No.820148JournalofCentralSouthUniversity(ScienceandTechnology)Aug.2014MBBR1,21,31(1.1001242.5100603.310052)/3.450.77(R)250%~300%(MBBR)(SND)(HRT)(19.2h→30.3h)(25.2→14.6)COD((51.16.3)mg/L)NH4+-N((2.762.02)mg/L)BASND(23.01.6)(R=250%)(19.50.9)(R=300%)(17.10.6)(R=300%)(15.10.4)(R=300%)39.4%~47.3%TNTN(18.442.60)(13.923.16)(14.932.19)(14.112.14)mg/LSND323~1143μm“”HRTDO(3.50.5)mg/L2.5~3.3MBBR0.353mg/(L·h)MBBRX703.1A1672−7207(2014)08−2920−08Characteristicsofsimultaneousnitrification-denitrificationinMBBRtreatingdomesticsewagewithlowC/NratioatlowtemperatureWANGChuanxin1,2,GONGLingxiao1,3,PENGYongzhen1(1.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,EngineeringResearchCenterofBeijing,BeijingUniversityofTechnology,Beijing100124,China;2.GuangzhouMunicipalEngineeringDesignandResearchInstitute,Guangzhou510060,China;3.ChinaUnitedEngineeringCorporation,Hangzhou310052,China)Abstract:Anoxic/oxicbiofilmsystemwasusedtotreatdomesticsewagewithm(C)/m(N)ratioof(3.45±0.77)andcharacteristicsofsimultaneousnitrification-denitrificationatlowtemperaturewereinvestigatedintheoxicmovingbedbiofilmreactor(MBBR).Theresultsshowthatthesystemadjuststotheseasonaldroppingoftemperature(25.2→14.6)bylengtheningthehydraulicretentiontime(HRT)(19.2h→30.3h),andasaresult,theeffluentCOD((51.16.3)mg/L)andNH4+-N((2.762.02)mg/L)concentrationsachieveclassAandclassBlimit,respectively.NitrogenremovalefficiencyofSNDislessaffectedbylowtemperatureand39.4%−47.3%ofinfluentTNcanberemovedbySNDattemperaturesof(23.01.6)(R=250%),(19.50.9)(R=300%),and(17.10.6)(R=300%),(15.10.4)2013−08−162013−10−15(21177005)(20111103130002)(1949−)[e-mail]8MBBR2921(R=300%),whichrealizeseffluentTNconcentrationsof(18.442.60),(13.923.16),(14.932.19),(14.112.14)mg/L,respectively.SimultaneousdenitrificationbecomesthekeyfactorofSND,biofilmwithaveragethicknessof323−1143μmcanformanoxicmicro-environment,andusingtheslowbiodegradablecarbonsourceininfluentcanachieveendogenousdenitrificationeffectivelyatlongHRT.BiofilminMBBRcanrealizesimultaneousnitrogenremovalat0.353mg/(L·h)atDOmassconcentrationof(3.5±0.5)mg/Landm(C)/m(N)ratioof2.5−3.3.Keywords:simultaneousnitrification-denitrification;biofilm;MBBR;biologicalnitrogenremoval[1][2][3]/(anoxic/oxicA/O)[4][5](MBBR)2090[6][7][8](simultaneousnitrificationanddenitrificationSND)SND/[9](C/N)m(C)/m(N)[10][11][12](DO)[13]MBBR[14]SNDSND/[8]MBBRSND11.1120dA/O()/1(fixedbedbiofilmreactor,FBBR)(movingbedbiofilmreactor,MBBR)64L73V:V:V=3:4:121/Fig.1Schematicdiagramofanoxic/oxicbiofilmreactor()45292212L20mm20mm20mm45%48L25mm10mm20%COD(251.156.0)mg/LNH4+-N(68.905.17)mg/LNO2−-N(0.040.05)mg/LNO3−N(0.670.45)mg/LTN(79.615.25)mg/Lm(C)/m(N)(3.450.77)(19.33.6)1.2103dMBBRSND(HRT)250%~300%1MBBRDOm(C)/m(N)SNDDOm(C)/m(N)SND3LDONaNO3C6H12O6NOx−-Nρ(NOx−-N)=16mg/Lρ(COD)=120mg/Lm(C)/m(N)=7.5ρ(MLVSS)=850mg/L(160.5)20~120min14000r/min2min0.45μm41.3COD5B-1COD()NH4+-NNO2−-NNO3−-NMLSSMLVSS[15]TNVarioTN/TOC()DOpHORPWTWMulti340iBX51EOS550DImage-ProPlus6.0S-4300(SEM)[16]MLSS(size-exclusionchromatography,SEC)(WatersCo.,USA)(dissolvedorganicmatter,DOM)(relativemolecularmassdistribution)[17]1.41.4.1SND[8]MBBR(40d)((0.100.01)kg·m−3·d−1)(3%)MBBRSND%100TN(100)1()NO()(NH)4SNDrRx(1)RSNDSND)NO(xNO2−-NNO3−-N)NH(4NH4+-Nrρ(TN)TN1.4.2MBBRSNDSNDNOx−xRNOe1/Table1Operationalparametersofanoxic/oxicbiofilmsystem/dR/%T/tSRT/dtHRT/htHRT,MBBR/hρ(MLVSS)/(mg·L−1)RNL/(kg·m−3·d−1)m(C)/m(N)1~3325023.01.645219.29.612189562620.100.013.00.434~5130019.50.945224.012.0130411231810.080.014.21.052~7730017.10.645226.513.3119010561340.070.004.00.478~10330015.10.445230.315.2134212321100.060.013.80.5tSRTtHRTtHRT,MBBRMBBR8MBBR2923(2)(3))(3NONHNOe4xxRRR(2))(5NONHNOe4xxRRR(3)4NHRNH4+-N(mg·L−1·h−1)xRNONOx−-NNOx−-NN2xRNOe(2)(3)O2NOx−xRNOOe2(4)CODNOOe42RRx(4)CODRCODO22OeRxxRRRNOeNOOeOe22(5)22.1/CODCODCOD(51.16.3)mg/LB22NH4+-NtHRTtHRTNH4+-NNH4+-N(2.762.02)mg/LAC/N(250%→300%)TN(23.01.6)(R=250%)(19.50.9)(R=300%)(17.10.6)(R=300%)(15.10.4)(R=300%)(18.442.60)(13.923.16)(14.932.19)(14.112.14)mg/L(a)ρ(COD)(b)ρ(NH4+-N)(c)ρ(TN)2/Fig.2Effectoftemperatureonperformanceofanoxic/oxicbiofilmreactor2.2MBBRSND103dMBBRN2O[18]MBBR/N2(2)SND39.4%~47.3%HRTHRTSNDMBBRNH4+-NNOx−-NCOD(COD4NO2−-NNO3−-N35)()4529242/SNDTable2CharacteristicsofSNDundertypicalconditionsinanoxic/oxicbiofilmsystem/dR/%T/tHR,MBBR/hTN/(mg·L−1)TN/(mg·L−1)RSND/%SND/(mg·d−1)1925022.39.68.0571.5539.422544830019.512.07.3968.3243.320686130017.113.37.1871.7440.016588430015.415.28.0968.4447.316353NO2−-NNO3−-N250%~300%22.319.517.115.4MBBRSND56.1%~93.2%53.8%~89.6%42.3%~71.5%52.5%~87.6%3Fig.3Effectoftemperatureonrateofelectronflowtransformation2.3MBBRSNDSND(2)MBBRSND2.3.1“”()()()MBBR(ρ(DOMBBR)=(30.5)mg/L)DO“”MBBR44MBBR300~600μm[19]MBBR4(1143119)(935121)(622103)(32382)μm250μm150μm4(c)(a)(b)(c)4MBBRFig.4CharacteristicsofbiofilmcarriersinMBBRDO((30.5)mg/L)MBBR“”DO5CODDO8MBBR29255DOFig.5EffectofDOconcentrationgradientondenitrifyingcapacityofbiofilmDODOρ(DO)=4.2~6.5mg/LNOx−-N20minNOx