Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Application of chemically enhanced backwash coping with algal inflow in desalination pretreatment using ceramic membrane

세라믹 분리막을 이용한 해수담수화 전처리 공정에서 조류 유입에 대한 유지세정 적용

  • Kang, Joon-Seok (Department of Environmental Engineering and Energy, Myongji University) ;
  • Park, Seo-Gyeong (Department of Environmental Engineering and Energy, Myongji University) ;
  • Lee, Jeong-Jun (Department of Environmental Engineering and Energy, Myongji University) ;
  • Kim, Han-Seung (Department of Environmental Engineering and Energy, Myongji University)
  • 강준석 (명지대학교 환경에너지공학과) ;
  • 박서경 (명지대학교 환경에너지공학과) ;
  • 이정준 (명지대학교 환경에너지공학과) ;
  • 김한승 (명지대학교 환경에너지공학과)
  • Received : 2018.01.30
  • Accepted : 2018.03.06
  • Published : 2018.04.16
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Abstract

In this study, the effect of chemically enhanced backwash(CEB) coping with algal(Heterosigma Akashiwo) inflow was evaluated in the seawater desalination pretreatment process using ceramic membrane. In order to confirm the possibility of long-term filtration operation, the recovery rate of transmembrane pressure(TMP) due to the CEB using NaOCl was examined. When the membrane flow rate was 83.3 LMH, the TMP was maintained within 200 kPa for 84 hours in seawater influent. As the algal counts of 30,000 cell/mL were injected into the influent of seawater, however, the TMP rapidly increased and exceed maximum value. Membrane fouling caused by the algae was very poorly recovered by usual physical backwash. The CEB was performed for 30 min(3 min circulation / 27 min immersion) with 300 mg/L of NaOCl. As a result of the CEB application, it was possible to maintain a stable operating of filtration during 10 days and the average recovery rate of TMP by the CEB was 98.1%. It has been confirmed that the CEB using NaOCl is very effective in removal of membrane fouling by algae, resulted in stable membrane filtration for the long-term operation.

Keywords

References

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