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Cost Optimization of Osmotically Assisted Reverse Osmosis.

Timothy V Bartholomew1, Nicholas S Siefert1, Meagan S Mauter1

  • 1National Energy Technology Laboratory , U.S. Department of Energy , 626 Cochrans Mill Road , P.O. Box 10940, Pittsburgh , Pennsylvania 15236 , United States.

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Summary
This summary is machine-generated.

We developed a cost optimization model for osmotically assisted reverse osmosis (OARO) to desalinate high-salinity brines. Cost-optimal designs minimize stages and saline makeup, achieving under $6/m³ for water recovery between 30-70%.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Water Treatment Technologies

Background:

  • High-salinity brine desalination presents significant challenges for conventional methods.
  • Osmotically Assisted Reverse Osmosis (OARO) is a promising multistaged membrane process for such applications.
  • Optimizing OARO configurations is complex due to nonlinear performance and interconnected operational parameters.

Purpose of the Study:

  • To develop a nonlinear optimization model for identifying minimum cost designs of OARO processes.
  • To comprehensively evaluate the decision space for OARO configurations and operations.
  • To minimize overall cost, considering both capital and operational expenditures.

Main Methods:

  • Development of a nonlinear optimization model with a cost-minimizing objective function.
  • Inclusion of nonlinear process performance and implicit relationships among process streams and stages.
  • Evaluation of multistaged membrane processes, saline sweep cycles, and water recovery.

Main Results:

  • Cost-optimal OARO designs typically minimize the number of stages and eliminate saline makeup streams.
  • Purging from the first sweep cycle and decreasing stage membrane area/sweep flow rates are favored.
  • Optimal configurations for 50-125 g/L TDS feed and 30-70% recovery yield costs <= $6/m³.

Conclusions:

  • The developed model effectively identifies cost-effective OARO designs for high-salinity brine desalination.
  • Future research should focus on membrane properties (structural parameter, burst pressure) and unit cost reduction.
  • OARO offers a viable solution for treating challenging saline water sources at competitive costs.