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Maximize the operating profit of a SWRO-PRO integrated process for optimal water production and energy recovery

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  • Wan, Chun Feng
  • Chung, Tai-Shung

Abstract

Pressure retarded osmosis (PRO) is a promising technology to reduce the specific energy consumption and the operating expenditure of a seawater reverse osmosis (SWRO) plant. In this study, a simple analytical PRO model is developed to predict the PRO performance as the dilution of draw solutions occurs. The model can predict the PRO performance with a high accuracy without carrying out complicated integrations and experiments. The operating profit of SWRO-PRO is also studied by calculating the profit generated for every m3 of seawater entering the process because maximizing the operating profit is the uttermost objective of the SWRO-PRO process. Based on the PRO analytical model, the operating profit and the dynamics of the SWRO-PRO process, a strategy has been proposed to maximize the operating profit of the SWRO-PRO process while maintaining the highest power density of the PRO membranes. This study proves that integration of SWRO with PRO can (1) push the SWRO to a higher recovery and maintain its high profitability, (2) effectively reduce the specific energy consumption of desalination by up to 35% and (3) increase the operating profit up to 100%.

Suggested Citation

  • Wan, Chun Feng & Chung, Tai-Shung, 2016. "Maximize the operating profit of a SWRO-PRO integrated process for optimal water production and energy recovery," Renewable Energy, Elsevier, vol. 94(C), pages 304-313.
    • Handle: RePEc:eee:renene:v:94:y:2016:i:c:p:304-313
    DOI: 10.1016/j.renene.2016.03.057
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    References listed on IDEAS

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    1. Wan, Chun Feng & Chung, Tai-Shung, 2016. "Energy recovery by pressure retarded osmosis (PRO) in SWRO–PRO integrated processes," Applied Energy, Elsevier, vol. 162(C), pages 687-698.
    2. Sharqawy, Mostafa H. & Zubair, Syed M. & Lienhard, John H., 2011. "Second law analysis of reverse osmosis desalination plants: An alternative design using pressure retarded osmosis," Energy, Elsevier, vol. 36(11), pages 6617-6626.
    3. Prante, Jeri L. & Ruskowitz, Jeffrey A. & Childress, Amy E. & Achilli, Andrea, 2014. "RO-PRO desalination: An integrated low-energy approach to seawater desalination," Applied Energy, Elsevier, vol. 120(C), pages 104-114.
    4. Bruce E. Logan & Menachem Elimelech, 2012. "Membrane-based processes for sustainable power generation using water," Nature, Nature, vol. 488(7411), pages 313-319, August.
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    Cited by:

    1. Touati, Khaled & Salamanca, Jacobo & Tadeo, Fernando & Elfil, Hamza, 2017. "Energy recovery from two-stage SWRO plant using PRO without external freshwater feed stream: Theoretical analysis," Renewable Energy, Elsevier, vol. 105(C), pages 84-95.
    2. Bader S. Al-Anzi & Ashly Thomas, 2018. "One-Dimensional Analytical Modeling of Pressure- Retarded Osmosis in a Parallel Flow Configuration for the Desalination Industry in the State of Kuwait," Sustainability, MDPI, vol. 10(4), pages 1-14, April.
    3. Touati, Khaled & Tadeo, Fernando & Elfil, Hamza, 2017. "Osmotic energy recovery from Reverse Osmosis using two-stage Pressure Retarded Osmosis," Energy, Elsevier, vol. 132(C), pages 213-224.

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