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A pilot study of high flux membrane process for responding to influent turbidity changes in reservoir water

호소수 탁도변화 대응을 위한 고플럭스 막여과공정의 Pilot 연구

  • Kang, Joonseok (Graduate school of Water Resources, Sungkyunkwan University) ;
  • Seong, Jayeong (Graduate school of Water Resources, Sungkyunkwan University) ;
  • Yoo, Jewan (Graduate school of Water Resources, Sungkyunkwan University) ;
  • Kim, Hyungsoo (Graduate school of Water Resources, Sungkyunkwan University) ;
  • Lee, Jaekyu (Toray Advanced Materials Korea Inc.) ;
  • Jeon, Minhyuk (Toray Advanced Materials Korea Inc.) ;
  • Cheon, Jihoon (Toray Advanced Materials Korea Inc.)
  • 강준석 (성균관대학교 수자원전문대학원) ;
  • 성자영 (성균관대학교 수자원전문대학원) ;
  • 유제완 (성균관대학교 수자원전문대학원) ;
  • 김형수 (성균관대학교 수자원전문대학원) ;
  • 이재규 (도레이 첨단소재(주)) ;
  • 전민혁 (도레이 첨단소재(주)) ;
  • 천지훈 (도레이 첨단소재(주))
  • Received : 2020.07.31
  • Accepted : 2020.10.30
  • Published : 2020.12.15

Abstract

In the membrane process, it is important to improve water treatment efficiency to ensure water quality and minimize membrane fouling. In this study, a pilot study of membrane process using reservoir water was conducted for a long time to secure high flux operation technology capable of responding to influent turbidity changes. The raw water and DAF(Dissolved Air Flotation) treated water were used for influent water of membrane to analyze the effect of water quality on the TMP (Trans Membrane Pressure) and to optimize the membrane operation. When the membrane flux were operated at 70 LMH and 80 LMH under stable water quality conditions with an inlet turbidity of 10 NTU or less, the TMP increase rates were 0.28 and 0.24 kPa/d, respectively, with minor difference. When the membrane with high flux of 80 LMH was operated for a long time under inlet turbidity of 10 NTU or more, the TMP increase rate showed the maximum of 43.5 kPa/d. However, when the CEB(Chemically Enhanced Backwash) cycle was changed from 7 to 1 day, it was confirmed that the TMP increase rate was stable to 0.23 kPa/d. As a result of applying pre-treatment process(DAF) on unstability water quality conditions, it was confirmed that the TMP rise rates differed by 0.17 and 0.64 kPa/d according to the optimization of the coagulant injection. When combined with coagulation pretreatment, it was thought that the balance with the membrane process was more important than the emphasis on efficiency of the pretreatment process. It was considered that stable TMP can be maintained by optimizing the cleaning conditions when the stable or unstable water quality even in the high flux operation on membrane process.

Keywords

Acknowledgement

본 연구는 환경부 "글로벌탑환경기술개발사업(2016002100001)"으로 지원 받은 과제입니다.

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