螯合剂处理重金属污染底泥的实验研究  

Experimental research on chelator for treatment of sediment contaminated by heavy metals

作　　者：方盛荣[1,2] 徐颖[1,2] 路景玲[2] 魏晓云[2] 谢志钢[2] 薛璐[2] 

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境科学与工程学院,江苏南京210098

出　　处：《化工学报》2011年第1期231-236,共6页CIESC Journal

基　　金：河海大学自然科学基金(2008432211)

摘　　要：A new type of heavy metal chelating agent,potassium diisopropyl dithiophosphate was synthesized and the treatment of sediment contaminated by heavy metals by this chelator was investigated.The results indicated that when the dosage of potassium diisopropyl dithiophosphate was 3%(mass),the stabilization rate of heavy metals in sediment,such as Pb,Cu,Cd,could reach more than 85%,and the effect was better than inorganic stabilization chemicals,like Na2S and Na3PO4. After treatment the sediment could meet the US standards for heavy metals waste landfill.Meanwhile,the maximum leaching capacity of the treated sediment was much lower than the case with inorganic stabilization chemicals,and such stabilization effect could be obtained in a wide range of pH. The heavy metals in sediment after treatment could be transformed from exchangeable to organically bound and residue,reducing secondary contamination risk when the environment has changed.A new type of heavy metal chelating agent,potassium diisopropyl dithiophosphate was synthesized and the treatment of sediment contaminated by heavy metals by this chelator was investigated.The results indicated that when the dosage of potassium diisopropyl dithiophosphate was 3%（mass）,the stabilization rate of heavy metals in sediment,such as Pb,Cu,Cd,could reach more than 85%,and the effect was better than inorganic stabilization chemicals,like Na2S and Na3PO4. After treatment the sediment could meet the US standards for heavy metals waste landfill.Meanwhile,the maximum leaching capacity of the treated sediment was much lower than the case with inorganic stabilization chemicals,and such stabilization effect could be obtained in a wide range of pH. The heavy metals in sediment after treatment could be transformed from exchangeable to organically bound and residue,reducing secondary contamination risk when the environment has changed.

关 键 词：重金属螯合剂 底泥 稳定化处理 重金属形态 

分 类 号：X524[环境科学与工程—环境工程]