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《Journal of Anhui Agricultural Sciences》 2008-27
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Experimental Study on Heavy Metal Variation Characteristics of Domestic Waste from Tibetan Plateau in Semi-aerobic Landfill Treatment

YANG Qiao-yan et al(Emei Branch of Southwest Jiaotong University,Emei,Sichuan 614202)  
[Objective] The aim was to provide the theoretical basis for the leachate treatment of Semi-aerobic landfill.[Method] Heavy metal(Cd,Pb,Ni,Cr and Hg) variation characteristics of domestic waste from Tibetan plateau area in semi-aerobic landfill unit were studied by circulating type semi-aerobic landfill structure.[Result] The pH value of leachate kept above 7.0 in the whole experimental process.The organic pollutants in the leachate were degraded and eliminated by the means of leachate recirculation to a large extent.The concn.of heavy metal in the leachate of semi-aerobic landfill unit was effected by some factors such as leachate pH value,solubility product constant of slightly soluble metal compounds and humic acid concn.Cd,Pb,Ni and Cr exhibited the fluctuation change to different degree except Hg which showed the downtrend all the time.The concn.of heavy metal in the leachate was increased with the degradation of garbage.[Conclusion] Cd,Ni and Pb in semi-aerobic landfill treated after 450 days could reach the concn.requirement of national sewage comprehensive emission standard to the first kind of pollutants.
【CateGory Index】: X705
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