Advances in environmental research

  • 제5권2호
  • /
  • Pages.141-151
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  • 2016
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  • 2234-1722(pISSN)
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  • 2234-1730(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Application of nanofiltration membrane in the recovery of aluminum from alkaline sludge solutions

  • Cheng, Wen Po (Department of Safety, Health and Environmental Engineering, National United University) ;
  • Chi, Fung Hwa (Department of Environmental Engineering Kun Shan University) ;
  • Yu, Ruey Fang (Department of Safety, Health and Environmental Engineering, National United University) ;
  • Tian, Dun Ren (Department of Safety, Health and Environmental Engineering, National United University)
  • 투고 : 2016.09.10
  • 심사 : 2016.10.07
  • 발행 : 2016.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

Large amounts of aluminum hydroxide ($Al(OH)_3$) exist in water purification sludge (WPS) because of the added aluminum coagulant in water treatment process. Notably, $Al(OH)_3$ is an amphoteric compound, can be dissolved in its basic condition using sodium hydroxide to form aluminate ions ($Al(OH)_4{^-}$). However, in a process in which pH is increasing, the humid acid can be dissolved easily from WPS and will inhibit the recovery and reuse of the dissolved aluminate ions. This study attempts to fix this problem by a novel approach to separate $Al(OH)_4{^-}$ ions using nanofiltration (NF) technology. Sludge impurity in a alkaline solution is retained by the NF membrane, such that the process recovers $Al(OH)_4{^-}$ ions, and significantly decreases the organic matter or heavy metal impurities in the permeate solution. The $Al(OH)_4{^-}$ ion is an alkaline substance. Experimental results confirm that a recovered coagulant of $Al(OH)_4{^-}$ ion can effectively remove kaolin particles from slightly acidic synthetic raw water.

키워드

과제정보

연구 과제 주관 기관 : National Science Council, Taiwan

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피인용 문헌

  1. The Application of Nanofiltration for Separating Aluminium and Lithium from Lepidolite Leaching Solution vol.5, pp.16, 2020, https://doi.org/10.1002/slct.202000274