生活垃圾焚烧飞灰理化特性与污染毒性研究

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Abstract Taking MSWI fly ash in Dalian as the research object, the physical, chemical properties and acid neutralization ability of municipal solid waste incineration (MSWI) fly ash, species, total amounts, pollution toxicity and chemical speciation of of heavy metal in MSWI fly ash were studied systematically in this work. And the influence of pH value of the leaching environment, leaching time, leaching temperature and oscillation modes on leaching behaviors of heavy metals in MSWI fly ash was also investigated. The results showed that MSWI fly ash was mainly composed of calcium containing mineral phases (calcium hydroxide and CaClOH, etc.) and chlorine containing mineral phases (sodium chloride and potassium chloride, etc.). The species of heavy metals in MSWI fly ash are complex and it is characteristic of significant pollution toxicity. The total amounts of Zn and Pb are more than 1000mg/kg. The leaching toxicity of Cd, Pb and Zn exceeds the requirements of "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2019) by 9.7, 7.1and 0.7times, respectively. In general, the leaching toxicity, migration and diffusion characteristics of heavy metals in MSWI fly ash have no significant mathematical correlation with their total amounts. This study could provide a solid theoretical basis for the safe disposal and resource utilization of MSWI fly ash.

Key words： municipal solid waste incineration fly ash heavy metal pollution toxicity chemical speciation leaching behavior

Received: 21 March 2023

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X705

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	FAN Cheng-cheng
	WANG Bao-min
	WANG Xiao-Jun

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FAN Cheng-cheng,WANG Bao-min,WANG Xiao-Jun. Study on physical and chemical characteristics and heavy metal leaching behavior of MSWI fly ash[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 149-159.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/IS1/149

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