The Efect of Rich Synthetic Copper-rich Solution on Anti-seepage Dense Pre-hydration Geosynthetic Clay Liner

Abstract

Dense pre-hydrated geosynthetic clay liners (DPH GCLs) were manufactured as innovative materials accompanied by the advantage of lower hydraulic conductivity (k). The k of DPH GCLs permeated with de-ionized water (DIW) was 9.8 × 10⁻¹² m/s. The effect of Cu²⁺ synthetic solution on DPH GCLs was discussed. Furthermore, the effect mechanism was studied on the basis of test technologies. A significant adverse impact on hydraulic performance of DPH GCLs is found when the concentration of Cu²⁺ is greater than 1 g/L. SEM, XRD, XRF, FTIR, and XPS analyses show that the effect of Cu²⁺ on DPH GCLs includes two steps. Firstly, Cu²⁺ interacts with hydrophobic organic matter (HOM), and the adhesion of bentonite is destroyed, and some holes appear. The Cu²⁺ contacts with bentonite directly, and Cu²⁺ interacts with bentonite through ion exchange. Passivated phenomenon occurs on the surface of the bentonite, and swelling ability of bentonite is reduced, which causes permeable DPH GCLs.

Keywords

geosynthetic clay liners / fense pre-hydrated geosynthetic clay liners / effect / Cu²⁺

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