非铬鞣废水沉淀物吸附剂制备与其除铬的可行性分析

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1、STUDYoNADSORBENTPREPARATIoNoFNoN．CHRoMETANNINGWASTEWATERPRECIPITATEANDITSFEASmILITYoFREMoVECHRoMEABSTRACTThechromiuminthewastewatercomemainlyfromtanningprocess，whichwasoftenremovedandrecycledbychemicalprecipitation．TheremovalofCr3+Canreachtoabout98％，buttherear

2、estillasmallamountofchromiuminthewastewaterafterprecipitation．Therefore，thelowconcentrationofchromium—containingwastewaterafterprecipitationneedtobefurthertreatedandreachtothenationalemissionstandard(Cr(VI)

3、dstotreatthelOWconcentrationofchromium—containingwastewater,suchasionexchange，membraneseparation，activatedcarbonadsorptionandSO011．However,thesemethodsarenotsuitableforapplicationinthemajorityof0111"enterprisebecauseofthehighercosts．Inrecentyears，avarietyofche

4、apmaterialswereusedasadsorbentstoremovetheheavymetalinthewastewater．Somestudieshaveshownthatmanybiologicalwastesareveryeffectiveadsorbent，suchaspeanuthulls，flyash，barkandSOon．Currently,zirconium，alumiumtanningandmoremetalbindingtanninghavegraduallybeenusedinth

5、etanningofpartvamp，clothing，sofaandlightleatherintheenterprise．Therearesomewastegeneratedinthisprocessandtheirmaincomponentisavarietyofmetalhydroxides．Inthis，topic，zirconium，alumium，titaniumoxideandhydroxideweresimulatedastheprecipitateinnon-chrometanningwaste

6、water．AndtheyweremodifiedorusedasadsorbentdirectlytostudytheadsorptionpropertiesofCr3+．Themainadsorbentmaterials，suchasZr(OH)4，AI(OH)3，Zr02，A1203一Ti02andprecipitateinactualalumiumtanningwastewaterweresynthesized，andaboveseveralmaterialswereusedasadsorbent，Cr3+

7、wasthetargetpollute．TheadsorptioncharacteristicsoftheabovematerialstoCr3+wasstudied，andsomeimportantconclusionsareasfollows．III(1)AdsorptionofCr”onZr(OH)4andZr02TheXRDanalysisofZr(OH)4showsthatitcallbecompletelyconvertedintoZrO，aRersinteringat500℃for3h．Zr(OH)4

8、andZr02haveagoodadsorptioneffecttoCrj+，andtheadsorptionamountofCr3+increaseswiththeincreasingoftemperature，TheadsorptionisothermsatdifferenttemperaturecanfitwithFreundlichmodelwell