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在废弃的尾矿土壤中,重金属迁移动态和固体液体分布策略

Bohan Wu¹, Quan Wan¹, Xiao Li¹

¹Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.

Journal of hazardous materials

|February 18, 2024

概括

矿山尾矿中的重金属从较大的土壤颗粒迁移到较细的土壤颗粒,增加了环境风险. 增加更大的颗粒大小分数可以减少这种重金属迁移风险.

科学领域:

环境科学环境科学
土壤科学土壤科学
地质化学地质化学

背景情况:

废弃的硫铁矿释放出含有高重金属 (HM) 度的尾矿.
土壤颗粒大小分数 (PSF) 影响HM移动性,但研究往往忽略了规模特定的行为.
了解跨PSF的HM固体液体分布对于风险评估至关重要.

研究的目的:

调查不同PSF和地点的废弃物中HM的固体液体分布.
阐明PSF和环境因素在HM迁移中的作用.
确定在受污染的矿山土壤中减轻HM风险的策略.

主要方法:

从废弃矿山的上游 (XWA),迁移路径 (XWB) 和下游 (XWC) 收集的土壤样本.
样品分成沙子,泥土,粘土,合物和溶解的部分.
分析HM分布和无机元素,有机物质和与谷蛋白相关的土壤蛋白 (GRSP) 的影响.

主要成果:

聚乙烯纤维的组成显著控制HM固体-液体分布.
在采矿区,较大的颗粒是HM沉;下游,较细的颗粒增加HM的移动性.
无机元素 (Mg,Al,Fe),有机物质和GRSP调节了PSF中的HM分布.

结论:

HM迁移与沿着尾矿途径从粗PSF转向细PSF的转变有关.
增加较大的PSF的比例可以有效地降低HM迁移风险.
尾带管理策略应考虑PSF来控制重金属污染.

关键词:

分发方式分发方式分发方式环境行为环境行为重金属重金属的使用.粒子大小分数粒子大小分数权衡策略权衡策略

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