流速及介质粒径对As(Ⅲ)迁移影响的实验研究
杜海玲 , 单慧媚 , 黄健 , 曾春芽 , 张进贤 , 刘允全
地球科学 ›› 2024, Vol. 49 ›› Issue (04) : 1459 -1469.
流速及介质粒径对As(Ⅲ)迁移影响的实验研究
Experiment on Influence of Flow Velocity and Medium Particle Size on As(Ⅲ) Migration
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为了解潜流带中地下水流速和介质颗粒对As(Ⅲ)迁移的影响,选用天然河砂为介质,配制地下水含As(Ⅲ)模拟液,开展室内批实验和动态柱实验并进行表征分析,探讨流速和介质粒径对As(Ⅲ)迁移的影响及机制.结果发现:(1)粒径越小的河砂与As(Ⅲ)相互作用平衡时间越长,As(Ⅲ)的单位吸附量(Q e)随着河砂粒径的增大而减小(0.15~0.18 mm的粒径河砂除外),单层最大吸附量(Q m)随着粒径的增大呈减小趋势;(2)As(Ⅲ)在河砂上的迁移行为表现出明显的粒径和流速效应;一方面,河砂粒径越小,比表面积越大,增加了水-砂相互作用时间和限制了地下水冲洗速度,不利于As(Ⅲ)在河砂中的迁移;另一方面,流速越大导致空隙通道内的水力剪切力增强,紊流强度的提高减小了滞留边界层厚度,利于As(Ⅲ)在河砂中的迁移.
flow rate / particle size / As(Ⅲ) / migration / hydrogeology
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国家自然科学基金项目(41877194;42167026)
广西自然科学基金项目(2022GXNSFBA035600)
广西高等学校千名中青年骨干教师培育计划第二期
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