DOI QR코드

DOI QR Code

Optimum Operating Condition for Micro-Filtration Process as a Seawater Desalination Pretreatment

해수담수화 전처리로서 가압식 MF 공정의 최적 운전조건 도출

  • Kim, Youngmin (Environmental Engineering Research division, Korea Institute of Construction Technology) ;
  • Jang, Jung-Woo (Econity Co., Ltd.) ;
  • Kim, Jin-Ho (Econity Co., Ltd.) ;
  • Choi, June-Seok (Environmental Engineering Research division, Korea Institute of Construction Technology) ;
  • Lee, Sangho (School of Civil and Environmental Engineering, Kookmin University) ;
  • Kim, Sukwi (Environmental Engineering Research division, Korea Institute of Construction Technology)
  • Received : 2013.07.19
  • Accepted : 2013.09.16
  • Published : 2013.09.30

Abstract

The relation between performance maintenance conditions and those cost efficiency was studied to choose an optimum operating condition in the seawater desalination pretreatment system. A hollow fiber microfiltration module, which was developed with domestic technology, was tested with the various operating conditions such as chemically enhanced backwash cycles and design dosages of a cleaning chemical. Transmembrane pressure was measured to investigate membrane fouling status and cleaning degree. In addition, economic analysis was performed to compare water production costs by the operation condition. As a result, The operation mode III, chemically enhanced backwash at once a day with 100 mg/L of sodium hypochlorite (NaOCl) was selected. The concurrent evaluation between membrane filtration performance and its economic analysis will be suitable to choose an efficient optimum condition.

본 연구는 해수담수화 전처리 기술로서 개발된 가압식 정밀여과(microfiltration: MF) 중공사막 모듈(막 면적 $35m^2$)의 성능평가를 목적으로 $1,000m^3/day$ 규모 해수담수화 파일럿플랜트를 대상으로 하였다. 약 3개월 동안 용존공기부상법으로 처리한 원수를 공급하여 $1.5m^3/m^2{\cdot}day$ 정유량 조건에서 여과주기, 유지 세정(chemically enhanced backwash: CEB) 농도와 세정 주기 변화 등에 따른 여과성능과 비용을 분석하였다. MF 막 성능 유지를 위한 유지 세정 시 약품 농도에 의한 영향보다는 반복 세정(4회/일)이 효과적이었으나, 경제적 측면에서는 회수율 제고를 위한 단일 세정 방식이 적절한 것으로 나타났다. 막간차압 및 비용분석을 통해 4가지 운전방식 중 1일 1회 NaOCl 100 mg/L 세정 방식을 최적 운전조건으로 도출하였다. MF 전처리 공정의 유지관리 조건 도출 시에는 성능 평가와 함께, 운전방식에 따른 경제성을 함께 고려하는 것이 적절할 것으로 판단된다.

Keywords

References

  1. Henthorne, L., Evaluation of Membrane Pretreatment for Seawater Reverse Osmosis Desalination, United States Bureau of Reclamation, Denver(2007).
  2. Huehmer, R. P., "MF/UF pretreatment in seawater desalination: applications and trends," in Proceedings of World Congress in Desalination and Reuse, International Desalination Association, IDAWC/DB09-253, Dubai(2009).
  3. Bush, M., Chu, R. and Rosenberg, S., "Novel trends in dual membrane systems for seawater desalination: minimum primary pretreatment and low environmental impact treatment schemes," IDA J., 2(1), 56-71(2010).
  4. Yun, J. S., Kim, S. H., Yoon, C. H. and Kim, G. T., "Microfiltration as Pretreatment of Reverse Osmosis for Seawater Desalination: Operation Efficiency and Factors Affecting its Efficiency," J. Kor. Soc. Environ. Eng., 26(4), 475-480(2004).
  5. Kim, S. H., Kim, C. H., Kang, S. H. and Lim, J. L., "Long Term Operation of Microfiltration as a Pretreatment for Seawater Reverse Osmosis Processes," J. Kor. Soc. Water Wastewater, 24(6), 735-741(2010).
  6. Voutchkov, N., "Considerations for selection of seawater filtration pretreatment system," Desalination, 261, 3854-364 (2010).

Cited by

  1. Application of chemically enhanced backwash coping with algal inflow in desalination pretreatment using ceramic membrane vol.32, pp.2, 2018, https://doi.org/10.11001/jksww.2018.32.2.097