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天然矿物组合材料渗透反应墙修复地下水镉污染

Keywords: 渗透反应墙,污染修复,重金属,石灰石,海泡石,膨润土,

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Abstract:

实验模拟地下环境,以天然矿物材料石灰石、海泡石和膨润土作为可渗透反应墙(PRB)填充材料,采用正交实验法设计了16种可渗透反应器,研究了天然矿物组合材料组配对污染地下水模拟液中镉污染的修复效果、出水pH、有效孔隙度和渗透系数的影响,同时对机理进行了分析。实验结果显示,组合材料对镉去除率达99.8%以上,石灰石对处理效果贡献最大,增加石灰石用量,处理效果明显改善,当石灰石含量为10%及更高时,对含镉1.0mg/L的污染地下水模拟液处理后镉浓度低于0.7μg/L,达到地下水质量标准GB/T14848-93规定的II类水质标准;石灰石用量的增加对渗透系数影响不大,但出水pH呈弱碱性(7

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