搜索
1111Vol．11No．11201711ChineseJournalofEnvironmentalEngineeringNov．20172012ZX07313-0012013ZX07314-0038632012AA063303“”2014BAC29B015157839751279108SH201712713DJ14001052016YFC04025042016－08－102016－10－131971—。E-mailjannet6@163．com*E-mailtj_dongbin@vip．163．com11122*21.2000932.200092solidretentiontimeSＲTEPSextra-microcolonypolymericsubstancesEMPSEPSextra-cellularpolymericsubstancesECPS2EPSDLVOEPS。SＲTEMPSECPSECPSEMPS。EMPSEMPS。X703A1673-9108201711-5836-07DOI10.12030/j．cjee．201608073EffectsofSＲTonactivatedsludgebioflocculationZHANYong1ZHANGHuanhuan1FENGQingqing1LIUMinghao2DONGBin2*HEQunbiao21.SchoolofEnvironmentandArchitectureUniversityofShanghaiforScienceandTechnologyShanghai200093China2.SchoolofEnvironmentalScienceandEngineeringTongjiUniversityShanghai200092ChinaAbstractThisstudyinvestigatedthebioflocculationcharacteristicsandthemechanismofactivesludgeatdiffer-entsolidretentiontimesSＲT．SequencingbatchreactorswithdifferentsolidretentiontimeswereemployedtoexaminetheinfluenceofthebioflocculationcharacteristicsandactivesludgemechanismonthetwocomponentsofEPSwhichcontainedflocsEPSextra-microcolonypolymericsubstancesEMPSandmicrocolonyEPSextra-cellularpolymericsubstancesECPS．BytestingtheextendedDLVOtheoryandtheEPScomponentsweana-lyzedthebioflocculationcharacteristicsandactivesludgemechanismsatdifferentSＲT．TheresultsshowedthatwiththeincreaseofSＲTbioflocculationcharacteristicsoftheactivesludgeimproved．Duringthisprocesstheinteractionenergycurveofthesludgehadanobviousbarrierthatbecamelowerintime．MeanwhilethelevelsofEMPSandECPSgraduallydecreasedshowingthatthechangesintheEMPScontentweremoreobviousthanthechangesintheECPScontent．TheproteinandhumicsubstancecontentofEMPSgraduallydecreasedaswellin-dicatingthathighersludgeinteractionenergybarrierandtheEMPScontentweretheinternalmechanismsoflowersludgeflocculation．ThechangeintheEMPScomponentsespeciallyinproteinandhumicsubstancecontentofEMPSwasthemainreasonofdiversesludgebioflocculationatdifferentSＲT．Keywordssolidretentiontimeextracellularpolymericsubstancesinteractionenergyflocculationability。solidretentiontimeSＲT11、1-3。、extrapolymericsubstancesEPS、4-5。、6-7EPS。EPSEPS、。5EPSEPSSEPSEPSLB-EPSEPSTB-EPSEPSLB-EPSLB-EPSTB-EPSEPS8-11。EPSEPS/12-13。DLVODLVOWtotDLVO-、、Lewis-DLVO14-15。EPSEPS。25±1℃。EPS16EPSEPSextra-microcolonypolymericsubstancesEMPSEPSextra-cellularpolymericsub-stancesECPS。。11.11Table1Waterqualityindexmg·L－1COD271±60BOD5210TN31.7±4.5NH+4-N30.5±3.1SS70.1±20.39.7±4.12000mg·L－13L。1。12L。64h10min、70min、130min、30min、10min80r·min－16L。25±1℃2～4mg·L－1。314d5、10、18、2535d3COD、MLSSSVI15%。1.2COD、MLSS、SVI17WGZ-1AflocculationabilityFA1850W15s10mL1200r·min－12min600nmA60r·min－115min10mL1200r·min－12minBFA=1－B/A×100%。7385111.3EPScationexchangeresinCEＲ-EPSextra-microcolonypolymericsubstancesEMPSEPSextra-cellularpolymericsubstancesECPS。25mL50mL4000g4℃12minPBSCEＲ70g·g－1MLVSS25mL4℃SHZ-C4h4℃、12000g12minEMPSPBS25mLJY88-IIN900J·mL－12min4℃、25000g20minECPS。EPSTOCTOCTOC-LCPNCN200。EPSFolin-LowrysigmaH1414080DNADNAsigmaD104784。1.4DLVODLVO-。DLVOLewis-WABWTOTWＲWA-WABDLVOWTOT=WA+WＲ+WAB1WA=－ABLBＲ12H2WＲ=2πεＲΨ2sln1+exp－kH3WAB=πＲλΔGABabhexpl0－H()λ4ABLBHamakerＲHl00.157nmεΨskSternΨsZetaλnmΔGABadh。ABLB=24πl20γLW槡B－γLW槡L25ΔGABabh=－4γ+槡B－γ+槡Lγ－槡B－γ－槡L6γLWBγLWLmJ·m－2γ+B、γ－B、γ+Lγ－L17。JC2000D3ZetazetaNANO-ZS90。22.1SＲT5、10、18、2535d。2。2SＲT5d35dMLSSCOD。FASVI。SBＲSVI100SVISＲTSBＲ35d。。FAFASＲTFA5～35dSＲT838511SBＲ。2Table2BasicindicatorsofreactorsperformanceunderdifferentSＲTSＲT/d510182535COD/%80.0±8.584.5±7.087.5±7.188.5±5.695.0±6.6MLSS/mg·L－11050±422372±623859±714899±1225932±194SVI/mL·gSS－177±1072±867±461±1090±8/NTU6.3±0.55.1±0.53.1±0.62.4±0.41.0±0.5FA/%24.1±0.3528.1±0.1531.0±0.3235.2±0.2240.2±0.22n=11n=5±。2.2SＲTDLVOZeta。3。12。3Table3BasicindicatorsofsludgeperformanceunderdifferentSＲT/d510182535Zeta/mV－21.3±2.6－19.3±2.6－17.4±1.5－16.5±1.2－12.4±1.229.6±1.631.8±1.233.4±2.036.5±1.541.7±1.3/°1-36.5±2.734.9±2.127.4±1.819.4±2.319.4±1.123.3±1.726.3±1.328.5±1.831.5±1.631.5±1.5HamakerJ·×10－21－12.83.13.43.74.2ΔGadh/mJ·m2－10.9050.9050.8290.7460.4161Fig．1InteractionenergycurvesofdifferentSＲT2Fig．2Correlationbetweenturbidityandinteractionenergycurves3ZetaZetaSＲT。938511SＲT。ΔGadh/mJ·m－2ΔGadh/mJ·m－2＞0ΔGadh/mJ·m－2。Hamaker。19。DLVO14-15。12DLVO5、10、18、2535d1568、1355、1056、838517KTＲ2=0.995d。SＲTDLVO。3EMPSECPSFig．3EMPSandECPSconcentrationofdifferentSＲTZe-taDLVO。2.3SＲTEPS2.3.1SＲTEMPSECPSEPSSＲTEPS。TB-EPSLB-EPS8-11EMPSECPS4EMPSECPSFig．4CorrelationbetweenEMPSandECPSconcentrationandturbiditySＲTEMPSECPS3。EMPSECPS4。EPSEPS、19。3SＲTEPSEMPSECPS。4EMPSECPSＲ20.980.87。Ｒ2EMPS。EPSEMPS。SＲTDLVODLVO。2.3.2SＲTEMPS0485115EMPSFig．5EMPScomponentconcentrationsofdifferentSＲTSＲTEPSEMPS。EPSEMPSSＲTEMPS5。SＲTSBＲ。5SＲT5d35dEMPS。EMPS67。67EMPSＲ20.970.99。EMPS。EPS20-21LIAO22。。EMPS。6EMPSFig．6CorrelationbetweenturbidityandproteinandhumicacidscontentinEMPS7EMPSFig．7CorrelationbetweentotalenergybarrierandproteinandhumicacidscontentinEMPS31SＲT5d35dSＲTSBＲ。2SＲT。。3SＲTEPS。ECPSEPSEMPS。EMPS、SＲT。EMPS。1485111．J．200228522-242LOVETTDAKAVANAGHBVHEＲBEＲTLS．Effectofsludgeageandsubstratecompositiononthesettlinganddewate-ri