干旱区危废填埋场与水源的缓冲距离及其调控

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Abstract Aiming at the problem that the buffer distance of hazardous waste landfills was unknown under meteorological and hydrogeological conditions in arid areas, this paper establishes a multi-process model of pollutant leakage and migration transformation in leachate, simulates the dilution and attenuation process of pollutants, and constructs a framework for calculating buffer distances in combination with the determination of safe water use limits, and a typical site was selected for a case study. The results show that different types of pollutants require different dilution and attenuation factors (RDAF). The initial concentration of 2,4-drops (2,4-D) of organic matter was large and toxic, so it needs to be diluted and attenuated 667 times, which was 6 times the dilution and attenuation coefficient of heavy metals As and Cd. The dilution and attenuation factor (DAF) of different pollutants was related to the sensitivity of the buffer distance, and the DAF of organic matter was more sensitive to the buffer distance. Although the DAF of 2,4-D was the largest, the buffer distance was far less than 972m and 942m of heavy metals As and Pb. Considering the buffer demand of all pollutants, the buffer distance of typical hazardous waste landfills in arid areas was 972m. Contrary to conventional perception, the buffer distance demand was greater than that in humid areas and only slightly less than that in coastal areas. Further considering the requirement of safe water use with a 95% confidence interval under parameter uncertainty analysis, the buffer distance should reach 3465m. To meet the actual demand for buffer distance between the sensitive water source and the landfill site, the pretreatment method was adopted to optimize the buffer distance of landfill waste. Taking As as an example, the initial concentration of As was reduced from 1.2mg/L to 1.02mg/L through pretreatment, and the buffer distance could be reduced to 200m, indicating that the demand for buffer distance in arid areas was more sensitive to the initial concentration.

Key words： dilution attenuation buffer distance heavy metal safe water quality

Received: 30 June 2022

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X523

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	Articles by authors
	JI Dong-liang
	XU Ya
	HUANG Zhao-qin
	DU Bu-yun
	ZHAO Man-ying
	YANG Feng

Cite this article:

JI Dong-liang,XU Ya,HUANG Zhao-qin等. Buffering distance between drought hazardous waste landfill and water source and its regulation strategy[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 712-721.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I2/712

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