生活垃圾焚烧飞灰固化体重金属动态浸出规律

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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.

Key words： fly ash solidification heavy metal dynamic leaching landfill

Received: 09 August 2018

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X705

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	Articles by authors
	LIU Jian
	HE Liang
	LUO Cheng-jie
	SONG Kai
	WANG Fei
	BAI Xue
	LI Qing-yi

Cite this article:

LIU Jian,HE Liang,LUO Cheng-jie等. Dynamic leaching rule of heavy metals in solidified body of fly ash from MSW incineration[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1087-1093.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1087

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