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(213016),3,,ResearchontheComparisonAmongDisposalMethodsforHeavyMetalEffluentLiDinglongJiangSheng(Dept.ofEnvironmentandSafetyEngineering,JiangsuPolytechnicUniversityChangzhou,Jiangsu213016)AbstractThreekindsofchemicalprecipitationmethods(neutralizationprecipitation,sulphideprecipitationandferritelaw)arediscussedandtheiradvantageanddisadvantagesarecomparedinseveralaspects,findingoutthatneutralizationprecipitationisaneffectiveandfeasibleway.Keywordsheavymetaleffluentprecipitationwastewatertreatment(pH=2.5)Pb2+Cd2+Cu2+Zn2+[13],(),,311.13:pH,;,,,pH,pH,;,,,;,,,,1.2():S2-,,:,,;,,,S2-H2S,1.3,,,,1,:Fe2++2OH-Fe(OH)2Fe3O4(3-x)Fe2++xM2++6OH-Fe3-xMx(OH)6MxFe3-xO4:Fe3+Fe2+=21,,Fe2+,22;NaOH0.91.2;,6070;,,1/(mgL-1)/(mgL-1)Cu2+95000.5Pb2+68000.1Cr2+20000.1Cd2+18000.181IndustrialSafetyandEnvironmentalProtection20053112December20052,,:(1):(2):,,,(3),,,,,(4),(5),,,,,3,,,pH,S2-,H2S,pH,10,;,,,,,Ca(OH)2,CuPbZn,Ca2+,3(2):pH,,,,,23pH,,,,,,,,,,43,,,,(),,,,,Pb2+Cd2+Cu2+Zn2+,,1,..:,19932,,,..,2003,26(1)3,..,2000,15(4)4,..,2003,26(1)(:20050222):::13L,,,,27.3L,6000L,21,,,,91