Extraction of Cadmium from Sewage Sludge Using Polyepoxysuccinic Acid  

作　　者：ZHU Zhi-Liang ZHANG Li-Hua ZHANG Hua QIU Yan-Ling ZHANG Rong-Hua ZHAO Jian-Fu 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092 China [2]Chemistry and Biology Engineering Department, Sanming College, Sanming 365004 China

出　　处：《Pedosphere》2009年第2期137-142,共6页土壤圈（英文版）

基　　金：Project supported by the National High Technology Research and Development Program (863 Program) of China(No.2006AA06Z384);the National Natural Science Foundation of China (No. 50478103)

摘　　要：Polyepoxysuccinic acid （PESA）, as an environmental benign biodegradable chelant, was used to remove heavy metals from the sewage sludge of Shanghai Taopu Wastewater Treatment Plant. The extraction of cadmium （Cd） from sewage sludge using aqueous solution of PESA was studied. It was found that PESA was capable of extracting Cd from the sludge, and the extraction efficiency was dependent on both pH and the concentration of the chelating reagent. The extraction efficiency decreased gradually with increasing of pH, whereas the dependency on pH decreased as the concentration of PESA increased. In the case of the high PESA to total metal ratio, e.g., 10：1, the extraction efficiency reached above 70% within the pH range from 1 to 7. The highest extraction efficiency obtained in tbe experiment was 78%. By comparing the contents of the heavy metals in sewage sludge before and after the extraction, it was found that the extracted Cd came mainly from the four fractions： acid-soluble, reducible, oxidizable, and water-soluble fractions.Polyepoxysuccinic acid (PESA), as an environmental benign biodegradable chelant, was used to remove heavy metals from the sewage sludge of Shanghai Taopu Wastewater Treatment Plant. The extraction of cadmium (Cd) from sewage sludge using aqueous solution of PESA was studied. It was found that PESA was capable of extracting Cd from the sludge, and the extraction effciency was dependent on both pH and the concentration of the chelating reagent. The extraction effciency decreased gradually with increasing of pH, whereas the dependency on pH decreased as the concentration of PESA increased. In the case of the high PESA to total metal ratio, e.g., 10:1, the extraction effciency reached above 70% within the pH range from 1 to 7. The highest extraction effciency obtained in the experiment was 78%. By comparing the contents of the heavy metals in sewage sludge before and after the extraction, it was found that the extracted Cd came mainly from the four fractions: acid-soluble, reducible, oxidizable, and water-soluble fractions.

关 键 词：CADMIUM EXTRACTION PESA sewage sludge 

分 类 号：X703[环境科学与工程—环境工程] TG174.42[金属学及工艺—金属表面处理]