煤矸石回填塌陷区重金属淋溶迁移时空规律

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Abstract The collaborative ecological governance demonstration test project in the coal gangue backfills subsidence area of a city in Shaanxi Province provided an example for this study. This research investigated the environmental pollution risks in the backfill area, where coal gangue was used as the backfill material. It analyzed the spatiotemporal laws of heavy metal leaching and migration. The variation and processes of heavy metals in the soil were simulated using Hydrus-1D.A comparison of measured values from the soil column experiment with the simulated values verified the model, and the analysis identified relationships between infiltration distances at different periods and concentration equilibrium times in various soil layers. The results demonstrated that the established model effectively simulated the migration and change patterns of heavy metals in the soil of the backfill area. Over time, the leaching concentrations of heavy metals varied with depth, ranked as Cr(Ⅵ) = Pb>Ni>Hg, with maximum migration distances of 21.60, 21.60, 20.70 and 16.20m, respectively. At different soil layer depths, the leaching concentrations of heavy metals followed the order Pb> Cr(Ⅵ)>Ni>Hg. The concentration trends increased rapidly and stabilized, with none exceeding the limit values. The findings confirmed no significant environmental pollution impacts occurred in the coal gangue backfill subsidence area.

Key words： coal gangue heavy metals soil pollution solute migration ecological environment

Received: 06 August 2024

PACS:

X53

Corresponding Authors: 赵康,教授,zhaok_666666@163.com E-mail: zhaok_666666@163.com

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	FENG Yin-cheng
	ZHAO Kang
	TIAN Xiang-qin
	MA Chao
	NIE Jing-lei
	HU Hua-long

Cite this article:

FENG Yin-cheng,ZHAO Kang,TIAN Xiang-qin等. Research on spatiotemporal patterns of heavy metal leaching and migration in coal gangue backfill subsidence area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1422-1430.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1422

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