상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제31권4호
  • /
  • Pages.311-319
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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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진공 막증류 공정의 스케일 막오염 형성에 관한 연구

Scale formation on vacuum membrane distillation for SWRO brine treatment

  • Hwang, Tae-Mun (Korea Institute of Civil Engineering and Building Technology) ;
  • Jang, Eun-Kyung (Korea Institute of Civil Engineering and Building Technology) ;
  • Nam, Sook-Hyun (Korea Institute of Civil Engineering and Building Technology) ;
  • Koo, Jae-Wuk (Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Eun-Ju (Korea Institute of Civil Engineering and Building Technology)
  • 투고 : 2017.07.12
  • 심사 : 2017.08.04
  • 발행 : 2017.08.29
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초록

Scale formation is inevitable problem when seawater is treated by vacuum membrane distillation. The reason is the high concentration of calcium ion($Ca^{2+}$), sulfate ion(${SO_4}^{2-}$) and bicarbonate ion(${HCO_3}^-$). These ions form calcium sulfate($CaSO_4$) and calcium carbonate($CaCO_3$) on the membrane. The scale formed on membrane has to be removed, because the flux can be severely reduced and membrane wetting can be incurred. This study was carried out to investigate scale formation and effectiveness of acid cleaning in vacuum membrane distillation for SWRO brine treatment. It was found that permeate flux gradually declined until volume concentration factor(VCF) reached around 1.55 and membrane wetting started over VCF over 1.6 in the formation of precipitates containing $CaSO_4$ during VMD operation. In contrast, when calcium carbonate formed on membrane, permeate flux was gradually reduced until VCF 3.0. The precipitates containing both $CaSO_4$ and $CaCO_3$ were formed on the membrane surface and in the membrane pore.

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참고문헌

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