Adsorption performance of Zn2+ and Mn2+ from coal gangue leachate on geosynthetic clay liners
DONG Xingling
DONG Shuning
WANG Bao
ZHOU Zhenfang
ZHU Shibin
Abstract：In order to verify the feasibility of geosynthetic clay liners (GCL) as liners material for coal gangne impoundment,batch tests were conducted to determine the adsorption capacity of bentonites sandwiched in GCL for Zn2+ and Mn2+ prior to using in situ.In this study,the parameters evaluated were solid and solution ratio and the pH of solution.The test results showed that the solid and solution ratio and the pH of solution had a significant effect on the adsorption capacity of bentonite.The adsorption capacity of the bentonites decreased 50％～ 90％ when the solid and solution ratio increased from 1 ∶ 200 to 1 ∶ 20,and decreased 50％～ 70％ as the solution pH decreased from 10 to 2.However,while under most extreme conditions,the adsorption capacity of bentonite was higher than that of most other clay soils.All the test results indicated that GCL could be used as a liner material for the coal gangue impoundment.
Keywords：coal ganguegeosynthetic clay linersheavy metalsleachate
Publication Date：2017-01-01