PAC-PAM联用研究进展综述-豆柴文库

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PAC-PAM联用研究进展综述
Introduction
PAC(Polyaluminumchloride)andPAM(Polyacrylamide)areapairofwidelyusedcoagulantsandflocculantsinwatertreatment.PACisapopularinorganiccoagulantthatcaneffectivelyremoveturbidity,colorandorganicmatterinwater.However,PACoftenresultsinanexcessivedosageandtheproductionofsludge.PAMisanorganicpolymerflocculantusedtoimprovetheperformanceofcoagulationandreducesludgeproduction.Therefore,thecombinationofPACandPAMhasbecomeanewresearchtrend.
Inthispaper,wearegoingtoreviewandsummarizetheresearchprogressofPAC-PAMcoagulation-flocculation,includingthemechanism,optimizationofconditions,andapplicationinwatertreatment.
MechanismofPAC-PAMCoagulation-Flocculation
Thecoagulation-flocculationmechanismofPAC-PAMisbasedontheadsorptionandbridgingeffectofPAM.PACisresponsibleforchargeneutralization,particledestabilization,andthegenerationofAl(OH)3flocs,whilePAMenhancestheflocsgrowth,improvesthesettlinganddewateringproperties.
WhenPAC-PAMcoagulation-flocculationoccurs,firstly,PACneutralizesthenegativechargeonsuspendedparticles,sothatparticlesarepartiallyorcompletelycoagulated.Then,PAMmoleculesentertheinterparticlespacesandparticipateinabridgingrole.Itadsorbstothecoagulatedparticlesbyelectrostaticattraction,andthuslinksthemtogethertoformlargeraggregates.PAMwillworktopromotetheagglomerationofPACflocs,extendingthecoagulationtimeandimprovingthestrengthoftheflocs.
OptimizationofPAC-PAMCoagulation-Flocculation
OptimizationofPAC-PAMcoagulation-flocculationisessentialtomaximizethebenefitsofthistechnology.FactorsaffectingtheperformanceofPAC-PAMcoagulation-flocculationincludePACdose,PAMdose,pH,temperature,andhydraulicretentiontime.
TooptimizethePACdose,theJartestisoftenusedtodeterminetheoptimaldose.ThePACdosagecanbeadjustedbasedonthecoagulantdemandoftheparticularwater,andtheconcentrationofthesuspendedsolid.ThePAMdosageisoftenproportionaltothePACdose.TheoptimalPAMdosewilldependontheparticlesize,concentration,andstabilityofthesuspendedparticles.
ThepHisanotherimportantfactoraffecting