HEAVY METALS RETENTION IN GEOSYNTHETIC CLAY LINERS AND ITS POTENTIAL ROLE IN ACID ROCK DRAINAGE TREATMENT

Angelica Naka, Zhenze Li, T. Inui, T. Katsumi, Hiroki Mogami
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引用次数: 4

Abstract

The capacity of geosynthetic clay liners (GCLs) to attenuate metals and metalloids such as Al, Fe, Cu, Zn, As, and Pb was evaluated in this study. For this purpose, free swell, sorption, and hydraulic conductivity tests on a needle-punched geosynthetic clay liner against a pH 3 artificial acid rock drainage (ARD) were conducted. Free swelling tests showed that at high metal concentration, the swell index decreased dramatically. Sorption test results showed that Na-bentonite had high capacity to sorb metals and metalloids. Hydraulic conductivity tests showed that k was 10 times lower when GCL was prehydrated with water, before permeating with ARD. Effluents were also evaluated in each case and results showed that the GCL tested has strong attenuation capacity toward metals and metalloids present in ARD, although desorption was observed in some cases.
土工合成粘土衬里的重金属截留及其在酸性岩石排水处理中的潜在作用
本研究评价了土工合成粘土衬垫(gcl)对Al、Fe、Cu、Zn、as和Pb等金属和类金属的衰减能力。为此,在pH为3的人工酸性岩石排水(ARD)条件下,对针刺土工合成粘土衬垫进行了自由膨胀、吸附和水力导电性测试。自由膨胀试验表明,在高金属浓度下,膨胀指数急剧下降。吸附试验结果表明,钠基膨润土对金属和类金属具有较高的吸附能力。水导率测试表明,在用ARD渗透之前,GCL与水预水合后k降低了10倍。对每种情况下的出水也进行了评估,结果表明所测试的GCL对ARD中存在的金属和类金属具有很强的衰减能力,尽管在某些情况下观察到解吸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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