Arsenic adsorption capabilities of soil-bentonite mixtures as buffer materials for landfills

• MINJA RWAICHI J.A.

  National Institute of Advanced Industrial Science and Technology

• EBINA TAKEO

  National Institute of Advanced Industrial Science and Technology

抄録

Removal and fixation of As (III) and As (V) from aqueous solution by soil/bentonite mixtures were studied to develop reliable clay liners for waste landfill sites. One of two soils such as, Masatsuchi. soil (weathered granite) and Murram soil (pumice) was used as a main body of the liner, and Wyoming bentonites were mixed with the soils because of its superior impermeability. As the result of batch experiments, it was shown that large part of As was removed by Masatsuchi soil without pH buffer, andth e result was better than those of Murram soil. Both soils appeared to have best adsorption of As (V) and As (III) within pH ranges of 3-6.5 and 7-9.5 at where the dominant species in the aqueous solution were H₂AsO₄^- and H₂AsO₃^-, respectively. A long-term leak test showed that Masatsuchi soil-Wyoming bentonite combination had the ability to remove all the As (III) from 4 ppm aqueous solution for more than 100 days.

収録刊行物

• Ｃｌａｙ　Ｓｃｉｅｎｃｅ

  Ｃｌａｙ　Ｓｃｉｅｎｃｅ 12 (1), 41-47, 2002

  一般社団法人 日本粘土学会

キーワード

• As adsorption
• Bentonite
• Hydraulic conductivity
• Clay

詳細情報

• CRID: 1390282679089594496
• NII論文ID: 110003709240
• NII書誌ID: AA00607148
• DOI: 10.11362/jcssjclayscience1960.12.41
• ISSN: 21863555
• ISSN: 00098574
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可