상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제31권4호
  • /
  • Pages.329-338
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  • 2017
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  • 1225-7672(pISSN)
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  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
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MD/RO 담수화 플랜트에서 발생한 농축수의 Ca 및 Mg 전처리를 위한 침전 처리 특성

Characteristics of precipitation treatment for Ca and Mg pretreatment of brine generated from MD/RO desalination plant

  • 심재호 (한양대학교 건설환경공학과) ;
  • 박재철 (한양대학교 건설환경공학과) ;
  • 임대환 (한양대학교 건설환경공학과) ;
  • 박주양 (한양대학교 건설환경공학과)
  • Shim, Jae-Ho (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Park, Jae-Chul (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Lim, Dae-Hwan (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Park, Joo-Yang (Department of Civil and Environmental Engineering, Hanyang University)
  • 투고 : 2017.07.19
  • 심사 : 2017.08.10
  • 발행 : 2017.08.29
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초록

The problem of disposal of brine due to increased MD/RO desalination plant has recently become a big social issue. The chlor-alkali process through electrolysis of brine has been studied as a method to overcome this problem. In order to increase the electrolysis efficiency, a pretreatment process for removal of hard substances must be preceded. In this study, we investigated the mechanism of removal of hardness through chemical precipitation. As a result, Ca was greatly influenced by addition of $Na_2CO_3$, and Mg was strongly influenced by pH. Also, the addition of NaOH and $Na_2CO_3$ enabled simultaneous removal of Ca and Mg, and showed a removal efficiency of 99.9% or more. Finally, the residual concentrations of Ca and Mg in the brine after the reaction were 0.14 and 0.13 mg/L, respectively. Saturation index was calculated using Visual MINTEQ 3.1, and solid phase analysis of the precipitate was performed by FE-SEM and PXRD analysis. It was confirmed that precipitate formed by the formation of calcite and brucite.

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참고문헌

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