Hydraulic conductivity of bentonite-polymer geosynthetic clay liners to aggressive solid waste leachates

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-05-24 DOI:10.1016/j.geotexmem.2024.05.006
Dong Li , Hanrui Zhao , Kuo Tian
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Abstract

Hydraulic conductivity of conventional mock sodium bentonite (Na–B) and bentonite-polymer (B–P) geosynthetic clay liners (GCLs) were evaluated with three synthetic leachates that are chemically representative of aggressive leachates from coal combustion product (CCR) (I = 3179 mM), mining waste (MW) (I = 2127 mM, pH = 2.0), and municipal solid waste incineration ash landfill (MSWI) (I = 2590 mM). The mock B–P GCLs were created by dry mixing bentonite with branched, linear, or crosslinked polymer. The polymer loading of mock B–P GCLs ranged from 3 to 15%. Comparative tests were also conducted with Na–B GCLs. The mock Na–B GCLs cannot maintain low hydraulic conductivity to aggressive CCR, MW, and MSWI leachates. Mock B–P GCLs with 10% branched polymer had low hydraulic conductivity (< 1.0 × 10−10 m/s) to synthetic MW and MSWI leachates at 20 kPa effective confining stress, whereas the hydraulic conductivity of mock B–P GCLs with 10% linear or crosslinked polymer ranged from 1.5 × 10−9 to 1.4 × 10−7 m/s. As the effective stress increased, the B–P GCLs branched polymer showed a faster decreasing trend than that of Na–B and B–P GCLs with linear or crosslinked polymer.

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膨润土-聚合物土工合成粘土衬里对侵蚀性固体废物沥滤液的导水性
用三种合成浸出物评估了传统钠基膨润土(Na-B)和膨润土-聚合物(B-P)土工合成粘土衬里(GCL)的导水性,这三种浸出物在化学上分别代表了煤燃烧产物(CCR)(I = 3179 mM)、采矿废物(MW)(I = 2127 mM,pH = 2.0)和城市固体废物焚烧灰渣填埋场(MSWI)(I = 2590 mM)的侵蚀性浸出物。模拟 B-P GCL 是通过将膨润土与支链、线性或交联聚合物干混而成。模拟 B-P GCL 的聚合物含量从 3%到 15%不等。还对 Na-B GCL 进行了比较试验。模拟 Na-B GCL 无法对侵蚀性 CCR、MW 和 MSWI 浸出液保持较低的水力传导性。含有 10% 支链聚合物的模拟 B-P GCL 在 20 kPa 有效约束应力下对合成的 MW 和 MSWI 浸出液的水力传导率较低(< 1.0 × 10-10 m/s),而含有 10% 线性或交联聚合物的模拟 B-P GCL 的水力传导率介于 1.5 × 10-9 至 1.4 × 10-7 m/s 之间。随着有效应力的增加,支化聚合物的 B-P GCLs 比 Na-B 和含有线性或交联聚合物的 B-P GCLs 显示出更快的下降趋势。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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