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两性聚丙烯酰胺絮凝性能的研究.docx

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两性聚丙烯酰胺絮凝性能的研究 Abstract Theflocculationperformanceofcationicandanionicpolyacrylamidewasstudiedinthispaper.Theflocculationexperimentswereconductedonturbidwatersamplesusingdifferentconcentrationsofpolymersolution.Theflocculationrate,turbidityremovalefficiency,andsettlingtimewereanalyzedtoevaluatetheperformanceofthetwotypesofpolyacrylamide.Theresultsshowedthatcationicpolyacrylamidehadhigherflocculationrateandturbidityremovalefficiencycomparedtoanionicpolyacrylamide.Theoptimalconcentrationofcationicpolyacrylamidewasfoundtobe0.1%whilethatofanionicpolyacrylamidewas0.5%.Inaddition,cationicpolyacrylamidehadashortersettlingtimecomparedtoanionicpolyacrylamide.Overall,cationicpolyacrylamideshowedbetterperformanceasaflocculantinturbidwatertreatment. Keywords:Polyacrylamide,flocculation,turbidityremoval,settlingtime. Introduction Watertreatmentisacriticalprocessthatinvolvestheremovalofimpuritiesandcontaminantsfromwatertomakeitsafeforconsumption.Oneofthecrucialstepsinwatertreatmentisflocculation,whichinvolvestheuseofpolymerstoaggregatesuspendedparticlesinthewaterandformlargerflocsthatcanbeeasilyremovedbysedimentationorfiltration.Polyacrylamideisoneofthemostwidelyusedpolymersinflocculationduetoitsexcellentflocculationperformanceandeaseofuse.Polyacrylamideisawater-solublepolymerthatcanbeclassifiedintocationic,anionic,andnonionictypesdependingonthechargesonthepolymerchain. Inthisstudy,wecomparedtheflocculationperformanceofcationicandanionicpolyacrylamideinthetreatmentofturbidwater.Theflocculationrate,turbidityremovalefficiency,andsettlingtimewereusedastheevaluationcriteriafortheperformanceofthetwotypesofpolyacrylamide. MaterialsandMethods Theexperimentswereconductedusingsyntheticturbidwatersamplespreparedbyaddingbentoniteclaytodistilledwatertoachieveaturbiditylevelof500NTU.Cationicandanionicpolyacrylamidesolutionswerepreparedbydissolvingthepolymersindistilledwateratdifferentconcentrationsrangingfrom0.1%to1%.Theflocculationexperimentswereperformedusingajartestapparatuswithsixbeakers.