刊登-Contentration-of-heavy-metals-in-six-municipal-sludges-from-Guangzhou

IntroductionTheincreasingnumbersofplantsforthetreatmentofwastewaterhavebroughtaboutanincreaseinthegenera-tionofsewagesludge[1].Largevolumesofsludgeneedtobedisposedofortreatedinsomemanner.Onewayofsludgedisposalisitsapplicationonland,andthishasbecomecommonpractice[2].TheapplicationofsewagesludgeonagriculturalsoilshasbeenwidespreadinmanycountriesaroundtheworldandthishasbeenshowntoPol.J.Environ.Stud.Vol.24,No.1(2015),165-174OriginalResearchConcentrationsofHeavyMetalsinSixMunicipalSludgesfromGuangzhouandTheirPotentialEcologicalRiskAssessmentforAgriculturalLandUseJingyongLiu1*,ZhongxuZhuo1,ShuiyuSun1,XunanNing1,SuyingZhao2,WumingXie1,YujieWang1,LiZheng1,RongHuang3,BingLi41SchoolofEnvironmentalScienceandEngineering,GuangdongUniversityofTechnology,Guangzhou510006,China2ChinaEnvironmentTechnology(HK)Limited,HK,999077,China3SchoolofManagement,GuangdongUniversityofTechnology,Guangzhou510520,China4DongguanChaoYingTextileCo.,Ltd.,Dongguan,523147,ChinaReceived:8April2014Accepted:3August2014AbstractSixkindsofmunicipalsludgesampleswerecollectedfromwastewatertreatmentplants(WWTPs)fromGuangzhouinsouthernChina.TotalconcentrationofCu,Pb,Zn,Cr,Ni,Cd,andMninthesludgewasdeter-mined,andusedobtainedvaluestoappraisethedegreeofagriculturallandpollutiononthebaseoffourpol-lutionindixes.ResultsshowedthattheconcentrationsoftheheavymetalsCu(4.567mg/kg),Mn(1.844mg/kg),Ni(148mg/kg),Cr(121mg/kg),andCd(5.99mg/kg)inS1sludgewerehigherthanthatoftheothersludges.InsixsludgesamplestheconcentrationsofMn,Zn,andCuwerehighest,followedbyNi,Pb,andCr.Cdhadthelowestconcentration.Allwerehigherthanthoserecordedinthebackgrounddataforcropsoils.WiththeexceptionofCuandCdfromsiteS1,andNifromsitesS1,S2,andS5,allothermetalconcentra-tionsconformedtopermissiblelevelsprescribedbythenationalapplicationstandardofacidsoilinChina(GB18918-2002).Thegeoaccumulationindex(Igeo)assessmentresultsindicatethatthereareseriousrisksinagriculturalutilizationfortheexistingCuandZninthesesixkindsofsludges,especiallytheIgeo,whichwas6.53forCu,3.21f