Abstract:Ultrasonic was applied to enhance extraction of heavy metals in municipal sludge with oxalic acid and hydroxyethyl ethylenediamine triacetic acid (HEDTA). The effects of ultrasonic radiation time, power intensity and stirring on extraction of heavy metals were investigated. Moreover, the transformation of heavy metal speciation in municipal sludge was analyzed by the application of tessier's sequential extraction procedure. In general, the extraction ratios of Cu, Ni and Cr in sludge were improved with the increasing of ultrasonic time, power intensity and stirring, the extraction ratios of Zn had no obviously improved. After the ultrasonic-assisted chemical extraction procedure, the content of organic compounds and residue forms of Cu, Cr and Ni were decreased. However, exchangeable and carbonate compounds forms of heavy metals were dramatically increased, the speciation of Zn in sludge was hardly changed.
涂剑成, 赵庆良, 杨倩倩. 超声辐射协同草酸-HEDTA浸提污泥中重金属[J]. 中国环境科学, 2011, 31(8): 1280-1284.
TU Jian-Cheng, ZHAO Qing-Liang, YANG Qian-Qian. Ultrasonic-assisted extraction of Cu, Zn, Ni and Cr in municipal sludge with oxalic acid and HEDTA. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(8): 1280-1284.