Energy efficiency of staged reverse osmosis (RO) and closed-circuit reverse osmosis (CCRO) desalination: a model-based comparison

Because this study focuses on comparing the energy efficiency during the reverse osmosis process in which desalination occurs, the effects of energy recovery devices are not considered in these models

Simeng Li; Karla Duran; Saied Delagah; Joe Mouawad; Xudong Jia; Mohamadali Sharbatmaleki

2020

Scholarcy highlights

  • Challenged by rapidly growing human population, increasing living standards, and deteriorating climate change around the world, freshwater scarcity is becoming an increasingly severe issue
  • Because this study focuses on comparing the energy efficiency during the reverse osmosis process in which desalination occurs, the effects of energy recovery devices are not considered in these models
  • When 90% recovery was set for the RO systems), the one-stage continuous configuration had the highest energy consumption for the same feed salinity, which was significantly lowered with the use of multistage continuous RO and circuit RO configurations
  • To achieve this high recovery of 90%), the one-stage CCRO configuration was better at decreasing the energy consumption than two-stage continuous RO, but not as energyefficient as three-stage continuous RO
  • The results derived from model simulations indicate that multi-stage CCRO would be an optimal configuration in terms of its theoretical benefits in energy efficiency, which could reduce energy consumption by up to 67.5% compared with one-stage continuous RO
  • The long-term stability of desalination performance in a full-scale CCRO system despite the temporally changing hydraulic pressure must be clearly investigated in order to realize the full potential of this emerging technology
  • Our future research will focus on calibrating and improving the numerical models using field testing data

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