芬顿试剂氧化对污泥脱水性能的影响

27620146ＲesearchofEnvironmentalSciencesVol．27No．6Jun．2014．J．2014276615-622．HONGChenXINGYiSIYanxiaoetal．InfluenceofFenton'sreagentoxidationonsludgedewaterabilityJ．ＲesearchofEnvironmentalSciences2014276615-622．2013－10－312[e-mail]．*[e-mail]*100083WCCSTρEPSEPS．EPSTB-EPSLB-EPSS-EPSWCCST．pH4wH2O2wFe2+40mggρEPS33.04%WCCST63.36%28.7s．PearsonρTB-EPSWCCSTP＜0.01ρLB-EPSρS-EPS．EPSρρ52.72、15.99mgL446.05、522.36mgL．X7051001－6929201406－0615－08ADOI10.13198j．issn．1001-6929．2014．06．08InfluenceofFenton'sＲeagentOxidationonSludgeDewaterabilityHONGChenXINGYiSIYan-xiaoWANGZhi-qiangLIUMinSchoolofCivilandEnvironmentalEngineeringUniversityofScienceandTechnologyBeijingBeijing100083ChinaAbstractThepotentialbenefitsofFenton'sreagentoxidationonsludgedewaterabilitywereinvestigatedinthisstudy．ThewatercontentofthesludgecakeandcapillarysoptimeCSTwereusedtoevaluatethesludgedewaterability．LayersoftheextracellularpolymericsubstanceEPScontentandthesmallorganicacidcontentinthesludgesupernatantweredeterminedtoillustratetheobservedchangesintheFentonconditioningprocess．TheresultsindicatedthatFentonconditioningcouldfacilitatetheEPSoxidativedecompositionandthetightlyboundEPSTB-EPSwerecrackedintothelooselyboundEPSLB-EPSandtheslimeEPSS-EPS．ThereforeFentonconditioningcouldsignificantlyreducethewatercontentofthesludgecakeandCST．TheidealconditionswouldincludeaH2O2dosageof40mggandaFe2+dosageof40mggatpH=4．ThetotalEPScontentswerereducedby33.04%whilethewatercontentofthesludgecakeandCSTdecreasedto63.36%and28.7srespectively．PearsoncorrelationanalysisresultsindicatedthatTB-EPShadsignificantcorrelationwiththewatercontentofthesludgecakeandCSTP＜0.01whichwastheimportantfactoraffectingthesludgedewateringperformance．TheresultsalsodemonstratedthatS-EPSandLB-EPShadaweakcorrelationwiththesludgedewateringperformance．HighperformanceliquidchromatographyHPLCanalysisshowedthatwiththeincreasingFenton'sreagentdosagetheEPSoxidativedecompositiondegreeandthespeciesandamountofsmallorganicmatterinthesludgesupernatantincreasedsignificantly．Theformicacidandaceticacidcontentsincreasedfrom52.72and15.99mgLoriginalsludgeto446.05and522.36mgLrespectivelyH2O2dosageof40mggandFe2+dosageof40mggatpH=4．KeywordssludgeFenton'sreagentoxidationdewaterabilityextracellularpolymericsubstance1-4．5-8．．279-13．LIU13-14H2O2Fe2+H2O2Fe3+H2O2Fe2+．15wH2O2wFe2+CSTSＲF．12．EPSextracellularpolymericsubstances16．EPS50%～90%17-18．EPS80%．EPS、、、DNAEPS70%～80%19．20-21SCOD、EPS．EPSEPSEPSS-EPS、LB-EPSTB-EPS22-233．ρS-EPS、EPS．EPS3、．S-EPS、LB-EPS、TB-EPSEPS．11.195%4℃．172h．30%H2O2、、、、、、、、、、、、、．1Table1PropertiesofthesludgeusedinthisstudyρmgL48952.55±244.78ρmgL32843.63±1644.26pH7.19±0.12%95.07±0.15CSTs180.22±5.61S-EPSρS-mgL360.32±15.75ρS-mgL74.53±6.64LB-EPSρLB-mgL152.14±7.75ρLB-mgL33.65±4.87TB-EPSρTB-mgL3020.56±130.46ρTB-mgL593.78±30.56ρmgL52.72±6.78ρmgL15.98±2.67ρmgL—1.2〔AB104－N－〕MY－3000－6DGF25003CSHB－ⅢpH〔FE20－〕304MTritonElectronicsTG16－WSKQ－800DBLC－20ADC18HPLCColumnΦ4.6mm×250mm5μm．1.31.3.1100mL150mL4molLH2SO4pHH2O2FeSO4·7H2O150rmin120min4molLNaOH．50mL150mm－0.055MPa30s．pHpH1～6wH2O240mggwFe2+20mggWCCST．pH4wH2O210～100mggwFe2+10～80mggwH2O2、wFe2+WCCST6166．H2O2ρEPSpH4wH2O210～100mggwFe2+40mggEPSρρ．Fe2+ρEPSpH4wH2O240mgwFe2+10～80mggEPSρρ．1.3.2WCWC=W1－W2W1×100%1WC%W1gW2105℃g．CSTCST．24EPS30mL3000rmin15minS-EPS30mL7400rmin15min0.45μmLB-EPS30mL20kHz480W10min15000rmin20min0.45μmTB-EPS．ρEPSFolin-Lowry25ρ26ρ．27-28、．1000mLKH2PO4pH=40.20molL70mLCH3OH0.45μm10min0.5mLmin40±1℃215nm20μL．22.12.1.1pHpH1．1pHWCCST．Fe2+H2O2·OH·OH1114．pH·OHFe2+29．pHFe2+FeOH3pHH+FeOOH2+Fe2+·OH．pH4WCCST64.75%34.9s．921pH．1pHFig.1EffectofpHonsludgedewaterability2.1.2H2O2Fe2+wH2O2、wFe2+2、3．．2a、3aWCCSTwH2O2．wH2O240mggWC78.87%66%CST180.1s50.0swH2O2≥60mggWCCST．H2O2·OHwH2O2·OH．wH2O2．wH2O240mgg．wFe2+WCCST．2b、3bwH2O240mggwFe2+10～80mggWCCSTwFe2+wFe2+40mgg．pH4wH2O240mgg71627wFe2+40mggWCCST63.36%28.7s15.51%84.06%．wFe2+mgg1—102—203—404—605—80．2WCFig.2WatercontentofsludgecakewithFenton'sreagentconditioningwFe2+mgg1—102—203—404—605—80．3CSTFig.3CSTchangesofsludgewithFenton'sreagentconditioning2.2EPSEPSρEPS70%～80%30EPSρ、ρ．2.2.1wH2O2ρEPS4ρEPS4229.97mggTB-EPSρTB-ρTB-3028.17593.59mgLρρ85.67%85.36%LB-EPSρLB-ρLB-143.1629.06mgLρρ4.05%4.18%S-EPSρS-ρS-363.3172.68mgLρρ10.28%10.45%．EPSTB-EPSLB-EPSS-EPS．EPSρρ．wH2O210mggρρ．ρS-EPS、ρLB-EPSρS-ρS-687.25%384.64%ρLB-ρLB-828.91%436.10%ρTB-EPSρTB-ρTB-3028.17593.59mgL916.54309.44mgL69.73%47.87%．wH2O2≥20mggEPSρρwH2O28166ρS-EPS、ρLB-EPSρTB-EPS．wH2O240mggρEPS2832.51mgL33.04%wH2O2ρEPS．wH2O20～10mggρEPSρTB-EPSρLB-EPSρS-EPS．TB-EPSL-EPSS-EPS．3ρρ．wH2O220～40mgg·OHEPSρEPS．wH2O2≥60mggH2O2Fe2+Fe3+Fe3+H2O2·OH31ρEPS．wFe2+40mggpH4wH2O20．ρEPSρρ．4wH2O2ρEPSFig.4EffectofH2O2dosageonEPScontent2.2.2wFe2+ρEPS5wFe2+ρEPSwFe2+ρ、ρ．wFe2+10～40mggρEPSρρ44.21%27.99%．wFe2+ρTB-EPSρLB-EPSρS-EPS．wFe2+60～80mggwFe2+ρEPSρTB-EPSρL-EPSρS-EPS．wFe2+Fe2+EPSwFe2+．Fe2+·OHwFe2+·OH2032wFe2+·OH·OHwH2O240mggpH4wFe2+0．ρEPSρρ．5wFe2+ρEPSFig.5EffectofFe2+dosageonE