零价铁活化过一硫酸盐联合单宁酸调理改善市政污泥脱水性能的机理研究-豆柴文库

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零价铁活化过一硫酸盐联合单宁酸调理改善市政污泥脱水性能的机理研究
Abstract:
Inthisstudy,themechanismofzero-valentiron(ZVI)activationofpersulfatecombinedwithtannicacidtoimprovethedewateringperformanceofmunicipalsewagesludgewasinvestigated.ThepotentialapplicationofZVIasanactivatorforpersulfateinsludgedewateringwasexplored.Theeffectsofvariousfactors,suchasZVIdosage,persulfatedosage,tannicaciddosage,andreactiontime,onthedewateringperformanceofsludgewereevaluated.TheresultsrevealedthatthecombinationofZVI,persulfate,andtannicacidsignificantlyenhancedthedewateringrateandefficiencyofthesludge.Themechanismsunderlyingtheimproveddewateringperformancewerealsodiscussed.Thisstudyprovidesinsightintothedevelopmentofacost-effectiveandefficientmethodforsludgedewateringinmunicipalwastewatertreatmentplants.
1.Introduction
Sludgedewateringisacrucialstepinwastewatertreatmentprocesses.Itinvolvestheremovalofexcesswaterfromthesludgetoreduceitsvolumeandfacilitatefurthertreatmentordisposal.However,sludgedewateringisoftenchallengingduetothecomplexnatureofthesludge.Municipalsewagesludge,inparticular,containsahighconcentrationoforganicmatter,whichhindersdewateringbyforminggel-likestructuresthatretainwater.Therefore,developingeffectivemethodstoimprovethedewateringperformanceofsludgeisofgreatimportance.
2.MaterialsandMethods
2.1Materials
Themunicipalsewagesludgeusedinthisstudywascollectedfromalocalwastewatertreatmentplant.Zero-valentiron(ZVI),persulfate,andtannicacidwereselectedastheactivator,oxidant,andconditioningagent,respectively.
2.2ExperimentalProcedure
Thesludgesampleswerefirstconditionedwithdifferentdosagesoftannicacid.Then,ZVIandpersulfatewereaddedtothesludge,andthemixturewassubjectedtodewateringinalaboratoryfilterpress.Thedewateringperformancewasevaluatedbymeasuringthemoisturecontentandcapillarysuctiontime.
3.ResultsandDiscussion
3.1EffectsofZVIDosage
TheresultsshowedthatthedewateringrateincreasedwithincreasingZVIdosageuptoacertainpoint,beyondwhichfurtherincreasesdidnotsignificantlyimprovethedewateringperformance.Thisca