Centrifugal reverse osmosis (CRO) − a novel energy-efficient membrane process for desalination near local thermodynamic equilibrium

Seawater reverse osmosis can address the global water crisis that is being exacerbated by climate change, industrialization, pollution, and population growth

William B. Krantz; Tzyy Haur Chong

2021

Scholarcy highlights

  • Seawater reverse osmosis can address the global water crisis that is being exacerbated by climate change, industrialization, pollution, and population growth
  • Conventional single-stage RO incurs a high energy cost owing to pressurizing the feed to that required for the desired recovery
  • This cost could be reduced if SWRO were operated at a progressively increasing pressure dictated by thermodynamic equilibrium for the local transmembrane salt-concentration difference
  • This is approached by the semi-batch closed-circuit RO process that progressively increases the transmembrane pressure; it incurs cumulative energy losses until the pressure is reached for the desired recovery
  • A TMP progressively increasing from 28 to 56 bar can be achieved with a centrifugal reverse osmosis module having a radius of 0.72 m rotating at 1000 rpm

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