Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Inorgainc fouling and it fouling reduction in direct contact membrane distillation process

직접 접촉식 막 증발공정에서 무기 막오염 특성 분석 및 저감방법

  • Lee, Tae-Min (Department of Civil Engineering, Kyungnam University) ;
  • Kim, Seung-Hyun (Department of Civil Engineering, Kyungnam University)
  • Received : 2020.01.31
  • Accepted : 2020.03.05
  • Published : 2020.04.15
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Abstract

This study was aimed to examine inorganic fouling and fouling reduction method in direct contact membrane distillation(DCMD) process. Synthetic seawater of NaCl solution with CaCO3 and CaSO4 was used for this purpose. It was found in this study that both CaCO3 and CaSO4 precipitates formed at the membrane surface. More fouling was observed with CaSO4(anhydrite) and CaSO4·0.5H2O(bassanite) than CaSO4·2H2O(gypsum). CaCO3 and gypsum were detected at the membrane surface when concentrates of SWRO(seawater reverse osmosis) were treated by the DCMD process, while gypsum was found with MED(multi effect distillation) concentrates. Air backwash(inside to out) was found more effective in fouling reduction than air scouring.

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References

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