Abstract：A dynamic leaching experiment was established using CH3COOH-CH3COONa solution with a pH of 5.5 and deionized water with a pH of 7.0 as initial leach liquor, aiming at studying the long-term leaching behavior of fly ash solidified body in the domestic waste sanitary landfill site. The difference in pH of the initial leach liquor would affect the structural integrity and the formation of crystal on the surface of fly ash solidified body. When CH3COOH-CH3COONa solution was used, the fly ash solidified body would be broken during the experiment. While deionized water was used, CaCO3 crystals formed on the surface of fly ash solidified body would inhibit the leaching of heavy metals. Both pH value and heavy metal concentration of the two groups' leachate tended to be stable until the experiment lasted about 120 days, and the final pH value of them were close to each other. However, in the group of deionized water, the amount of cumulative leaching of Pb and Cr were significantly higher than that of CH3COOH-CH3COONa solution, and the leaching concentration of Pb (0.29mg/L) even once exceeded the landfill entry limit, which should be concerned for the potential risk.
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LIU Jian, HE Liang, LUO Cheng-jie, SONG Kai, WANG Fei, BAI Xue, LI Qing-yi. Dynamic leaching rule of heavy metals in solidified body of fly ash from MSW incineration. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1087-1093.
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