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Cation interception and permeability characteristics of bentonite barriers exposed to NaCl and NH4Cl solutions.
Sun, Wen-Jing; Tang, Qian-Tong; Fan, Ri-Dong; Yang, Ai-Wu; Tan, Yun-Zi; Leung, A K.
Afiliación
  • Sun WJ; College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China E-mail: wjsun@dhu.edu.cn.
  • Tang QT; College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
  • Fan RD; College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
  • Yang AW; College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
  • Tan YZ; College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China.
  • Leung AK; Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Water Sci Technol ; 90(4): 1198-1209, 2024 Aug.
Article en En | MEDLINE | ID: mdl-39215732
ABSTRACT
High concentrations of Na+ and NH4+ in landfill leachate lead to deterioration of bentonite barrier and pose a threat to the environment. This study focused on the pollution interception and permeability characteristics of the bentonite barrier exposed to NaCl and NH4Cl solutions. Based on previous findings, salt solution concentrations were established at 74.80, 37.40, 18.70, and 9.4 mmol/L. The bentonite contents in the mixture were set at 0, 5, 10, and 15%. The results indicate that the samples exhibit better interception of NH4+ compared to Na+. This difference arises from the cation exchange sequence, the size of the hydration radius, and the hydrogen bonding of the two cations. Additionally, the difference in hydration enthalpy between the two cations leads to variations in the swelling of bentonite, resulting in a higher hydraulic conductivity coefficient in NH4Cl solution. This study shows that although bentonite barriers have better interception for NH4+, they exhibit greater hydraulic conductivity in NH4Cl solution, increasing the risk of leachate carrying other contaminants.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Permeabilidad / Bentonita / Cloruro de Sodio Idioma: En Revista: Water Sci Technol Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Permeabilidad / Bentonita / Cloruro de Sodio Idioma: En Revista: Water Sci Technol Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido