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Hydraulic conductivity of bentonite-polymer composite geosynthetic clay liners permeated with bauxite liquor
Geotextiles and Geomembranes ( IF 4.7 ) Pub Date : 2021-04-01 , DOI: 10.1016/j.geotexmem.2020.10.015 Qin Li , Jiannan Chen , Craig H. Benson , Daoping Peng
Geotextiles and Geomembranes ( IF 4.7 ) Pub Date : 2021-04-01 , DOI: 10.1016/j.geotexmem.2020.10.015 Qin Li , Jiannan Chen , Craig H. Benson , Daoping Peng
Abstract The high ionic strength of the porewater in red mud (bauxite liquor from digestion) can suppress swelling of montmorillonite, resulting in geosynthetic clay liners (GCLs) that are too permeable to be effective as liners in red mud disposal facilities. Bentonite-polymer composite GCLs (BPC GCLs) have been developed as more resilient lining materials, and some BPC GCLs have been shown to have very low hydraulic conductivity to bauxite liquors that have extreme ionic strength and pH. In this study, a nationwide investigation was conducted in China to evaluate the characteristics of bauxite liquor in Chinese impoundments, and to evaluate the suitability of GCLs containing granular sodium bentonite or BPCs for containment. Hydraulic conductivity tests were conducted on six BPC GCLs with two characteristic Chinese bauxite liquors that are hyperalkaline (pH > 12) and had ionic strengths of 76.9 mM and 620.3 mM. The BPC GCLs had hydraulic conductivity ranging from 10−8-10−12 m/s, which is higher than the hydraulic conductivity of BPC GCLs to deionized water (10−12-10−13 m/s), but lower than the hydraulic conductivity of conventional GCLs with granular sodium bentonite GCLs to the same liquors (10−7-10−8 m/s). The hydraulic conductivity of the BPC GCLs depends on the chemical properties of the leachate, the polymer loading, and the type of polymer. Microstructural analysis by scanning electron microscopy (SEM) suggests that the hydraulic conductivity of BPC GCLs is controlled by pore-blocking by polymer hydrogel, which is affected by the bauxite liquor.
更新日期：2021-04-01
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