Rejection Characteristics of Various Heavy Metals by Low-pressure Nanofiltration

저압나노여과에 의한 각종 중금속의 제거 특성

  • 오정익 (한국수자원공사 수자원연구원 국제상하수도연구소) ;
  • 김한승 (한국수자원공사 수자원연구원 국제상하수도연구소) ;
  • 김충환 (한국수자원공사 수자원연구원 국제상하수도연구소)
  • Received : 2004.06.12
  • Accepted : 2004.07.30
  • Published : 2004.08.15

Abstract

Rejection characteristics of heavy metals by nanofiltration membranes were investigated. Nanofiltration membranes rejected heavy metals much better than chloride, sulfate and TOC, of which concentration in synthetic wastewater was higher than that of heavy metals. To consider rejection characteristics of various metals by nanofiltration membranes, separation coefficient, which is the ratio of the metal permeation rate to the chloride ion or TOC permeation rate, was introduced. In spite of different materials and different nominal salt rejection of nanofiltration membrane used, the separation coefficients of metals were nearly the same. In particular, the separation coefficient of arsenic against chloride ion and TOC was larger than any other separation coefficient of heavy metals. These phenomena were observed in the relationship between the molar conductivity and the separation coefficient for heavy metals.

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