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Applied energy v.212, 2018년, pp.1038 - 1050   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Techno-economic evaluation of various RO+PRO and RO+FO integrated processes

Wan, Chun Feng (Corresponding author. ) ; Chung, Tai-Shung ;
  • 초록  

    Abstract Pressure retarded osmosis (PRO) and forward osmosis (FO) have been proposed to integrate with seawater reverse osmosis (RO) in order to reduce the overall energy consumption of desalination. However, their economic advantages in comparison to conventional RO have not been validated. This study aims to use well-developed mass transfer and economic models to investigate the technical and economic feasibilities of four potential RO and PRO/FO hybrid processes. They are (1) RO and open-loop PRO (referred to as RO+oPRO) to harvest the osmotic energy using energy recovery devices (ERDs), (2) RO and closed-loop PRO (RO+cPRO) to harvest the osmotic energy and recycle the pressurized and diluted brine as seawater feed to RO, (3) RO and FO post-dilution (RO+FO) to dilute and recycle the RO brine, and (4) seawater feed pre-dilution by FO before entering RO (FO+RO) to reduce the RO operating pressure. RO+oPRO takes advantage of the osmotic energy and reduces the RO operating expenditure (OpEx), but requires huge additional capital expenditure (CapEx) that renders it uneconomical. RO+cPRO reduces both OpEx and CapEx because it eliminates the need of additional ERDs and downsizes the seawater intake, pretreatment and brine discharge units. RO+FO achieves the same CapEx saving as RO+cPRO but at an increased OpEx. FO+RO dilutes the seawater, reduces the RO operating pressure and significantly lowers OpEx, especially at a high RO recovery. Based on the analysis, we believe that RO+cPRO and FO+RO are the two most economical and promising processes to reduce both OpEx and CapEx of seawater desalination. Highlights Techno-economic analysis is conducted with mass-transfer and cost models. Closed-loop PRO can significantly reduce the CapEx and OpEx of seawater desalination. FO pre-dilution can dilute the seawater feed to RO and reduce the RO pressure and OpEx. Important to make PRO/FO membranes cost-friendly and endurable.


  • 주제어

    Reverse osmosis .   Pressure retarded osmosis .   Forward osmosis .   Techno-economic evaluation .   Cost modelling.  

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