氰渣豁免处置情景下的地下水污染与健康风险

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Abstract Exempted disposal is a means to dispose of hazardous waste using non-hazardous waste disposal facilities under risk-controlled conditions, which is of great significance to enhance the national hazardous waste hierarchical classification management and precise pollution control capability, but quantitative risk assessment studies under exempted disposal conditions are still scarce. In this paper, nine general industrial solid waste landfills (NISWL) in North China were selected as typical hazardous waste-cyanide slag as an example, and the groundwater contamination characteristics and health risks of cyanide slag under the exempted disposal conditions of NISWL were predicted by systematic sampling, leaching characteristics analysis and process model simulation. The results showed that, except for NISWL A and NISWL B, the exposure concentrations of the other seven NISWLs due to the aging and long-term leakage of landfill materials exceeded the groundwater Class III water quality limits by 0.64~29 times, and the health risks were mainly due to the carcinogenic risk of As and non-carcinogenic risk of T-CN, which exceeded the acceptable risk levels by 31~270 times and 17.2~305.5 times, respectively. The health risks mainly came from the carcinogenic hazards of As and non-carcinogenic hazards of T-CN, which exceeded the acceptable risk level by 31~270 and 17.2~305.5 times respectively. The main reason is that cyanide in cyanide residue degrades slowly, resulting in higher residual toxicity, higher leaching concentration, and higher health risk due to serious contamination of HDPE film after deterioration and leakage.The study of admission leaching toxicity control based on risk control shows that there are differences in the control limits of T-CN admission concentration of different NISWLs, which are distributed between 1.15~3.25mg/L, and all of them are strictly higher than the limit (5mg/L) specified in the Technical Specification for Cyanide Residue Pollution Control in Gold Industry (HJ 943-2018). The above research results suggest that (1) admission leaching concentration limits should be set considering the long-term risk caused by the aging of landfill engineering materials, and more stringent admission concentration control limits should be set. (2) The size of the risk is affected by the scale of the site, regional meteorology, hydrology and geology, so the entry leaching concentration control limit should also take into account the above-mentioned differences and determine the zoning classification.

Key words： exemption from disposal leaching toxicity health risks risk management and control hierarchical classification

Received: 19 July 2021

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X523

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	Articles by authors
	NAI Chang-xin
	QIU Pan-pan
	XU Ya
	LAI Kai-lun
	CHANG Jing-run

Cite this article:

NAI Chang-xin,QIU Pan-pan,XU Ya等. Groundwater pollution and health risks under exemption of cyanide residue disposal scenarios[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 688-696.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/688

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