Microwave and Ultrasound Assisted Extraction of Heavy Metals from Sewage Sludge by HEDTA and Oxalic Acid
Ultrasound and microwave were applied to enhance extraction of heavy metals in sewage sludge with oxalic acid and hydroxyethyl ethylenediamine triacetic acids (HEDTA), and the effects of radiation time, power and energy of ultrasound and microwave on the extraction of heavy metals from sewage sludge were investigated. Besides, species of heavy metals fractions in sewage sludge before and after extraction were analyzed by the application of Tessiers sequential extraction procedure. In general, the extracted fractions of Cu, Ni and Cr in sludge were improved with the increase of time, power and energy, the extracted fraction of Zn had not been obviously improved. After the ultrasonic-assisted and microwave chemical extraction, the contents of organic compounds and residue forms of Cu, Cr and Ni were decreased. However, the contents of exchangeable and carbonate compounds forms were slightly increased, the speciation of Zn in sludge was hardly changed.
TU Jiancheng ZHAO Qingliang YANG Qianqian
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, Chin School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, Chin
国际会议
2011 International Symposium on Environmental Science and Technology(2011 环境科学与技术国际会议 2011 ISEST)
广东东莞
英文
1010-1015
2011-06-01（万方平台首次上网日期，不代表论文的发表时间）