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Xuejiang Wang,Jie Chen,Xiangbo Yan,Xin Wang,Jing Zhang,Jiayu Huang,Jian-FuZhao 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Citric acid chemical extraction technology in combination with ultrasonication was used to removeheavy metals from industrial and municipal mixed sludge. The removal efficiencies of Zn, Ni, Cr and Cureached 53.5%, 40.2%, 35.4% and 13.1%, respectively, at citric acid concentration of 0.2 M assisted byultrasound for 20 min. The extracted Zn, Ni and Cr mainly came from acid-soluble, reducible andoxidizable fractions, and Cu mainly came from oxidizable and reducible fractions. The presence of Fe3+,Al3+ and Ca2+ improved the extraction efficiency of Cu from the sludge significantly. The extracted sludgecould be used for soil amendment.