碳酸化对不同碱度飞灰中重金属的长期影响

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Abstract Through carbonation treatment of domestic waste incineration fly ash in different areas, and the physical and chemical characteristics of fly ash are analyzed by XRF, SEM, and XRD, then the long-term impact of CO₂ on the excessive heavy metals of Zn, Pb and Cd in different incineration fly ash is studied by pH measurement, heavy metal leaching experiment and heavy metal speciation analysis. The research shows that the incineration fly ash displayed different alkalinity characteristics due to the reduction of flue gas emission limits in the incineration process, which required a large amount of deacidification agent such as calcium hydroxide. According to the pH value of the leaching solution after the acetic acid buffer solution leaching experiment, the fly ash is divided into "acid ash" and "alkali ash", and the long-term carbonation experiments are carried out. The results showed that the leaching toxicity of heavy metals in "acid ash" was much higher than that of "alkali ash", but the leaching concentration of heavy metals Zn and Cd in "acid ash" after carbonation are reduced by 10%~18% and 9%~30% respectively. The leaching concentration of heavy metals Zn and Cd in "alkali ash" increased significantly, and the maximum leaching concentration exceeded 1.46 and 63.2 times of the standard for pollution control on the municipal solid waste incineration. The leaching of amphoteric heavy metal Pb in "acid ash" and "alkali ash" is not regular after carbonation, but in general, carbonation has a greater effect on heavy metal Pb in "alkali ash". Finally, the change law of heavy metals in fly ash before and after carbonation is analyzed by BCR sequntial extraction procedure. The BCR results show that the leaching concentration of heavy metals Zn and Cd in "acid ash" shows a downward trend affected by the increase of the proportion of T4after carbonation, but the proportion of T1in some samples increases, which indicated that such heavy metals still have leaching risk. However, the leaching concentration of heavy metals Zn and Cd in "alkali ash" shows an increasing trend affected by the increase of the proportion of T1after carbonation. Therefore, we should focus on the leaching characteristics of heavy metals in fly ash with different alkalinity before landfill disposal, and provide guarantee for long-term stable landfill of fly ash.

Key words： domestic waste fly ash carbonation leaching toxicity alkalinity heavy metals

Received: 11 January 2022

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X705

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	Articles by authors
	SHE Kai-lang
	LI Ping
	LIU Jing-cai
	YAO Guang-yuan
	XU Ya
	XU Rong-bin
	ZHAO Yu-xin
	LIU Yu-qiang

Cite this article:

SHE Kai-lang,LI Ping,LIU Jing-cai等. Long-term effect of carbonation on heavy metals in fly ash of different alkalinity[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3832-3840.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3832

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