Study on the long-term changes of heavy metal content and leaching behavior of municipal solid waste incineration fly ash
TONG Li-zhi1,2, WEI Li-hua2,3, WANG Feng2,3, HU Qing2,3, HU Bin2,3
1. School of Environment, Harbin Institute of Technology, Harbin 150090, China; 2. School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518000, China; 3. Engineering Technology Innovation Center, Southern University of Science and Technology, Beijing 100083, China
Abstract：Both acid digestion and high definition X-ray fluorescence spectrometry (HDXRF) methods were used to measure the contents of Cu, Pb, Zn, Ni and Cd for 24fly ash samples. The good correlation(coefficient of determination R2≥0.90) determined by linear regression analysis between the results from these two methods demonstrated that HDXRF was an accurate and rapid technique for the determination of heavy metal content. Then, HDXRF was used to evaluate fly ash samples collected from a typical grate incinerator for six months. The results showed thatthe monthly average contents of heavy metals remained consistent with coefficient of variation (CV) less than 0.14, whiletheir daily average contents fluctuated significantlywithCV over 2.54; changes in contents of Pb, Cu and Zn were positively correlated; andthe metal leaching concentration was significantly affected by the pH of the end point of the leaching solution, Pb and Cd were the elements that exceed the stipulated limit (GB 16889-2008) most, followed by Ni, Cu and Zn.The short-term variations of metal contents and leaching toxicity were affected by many factors, including the conditions of incineration, purification technologies of flue gas, and compositions of wastes, et al. To assess the effectiveness of garbage sorting in reducing heavy metals at source, a rapid detection method (e.g., HDXRF) could be adopted to monitor heavy metal contents of fly ash for a long period.
童立志, 韦黎华, 王峰, 胡清, 胡滨. 焚烧飞灰重金属含量及浸出长期变化规律研究[J]. 中国环境科学, 2020, 40(5): 2132-2139.
TONG Li-zhi, WEI Li-hua, WANG Feng, HU Qing, HU Bin. Study on the long-term changes of heavy metal content and leaching behavior of municipal solid waste incineration fly ash. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2132-2139.
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