Design and operation of membrane distillation with feed recirculation for high recovery brine concentration

Conventional brackish and seawater reverse osmosis systems are not readily applied for further concentration, towards zero-liquid-discharge, of desalination brines, produced water from hydraulic fracturing, and industrial effluents

Jaichander Swaminathan; John H. Lienhard

2018

Scholarcy highlights

  • Conventional brackish and seawater reverse osmosis systems are not readily applied for further concentration, towards zero-liquid-discharge, of desalination brines, produced water from hydraulic fracturing, and industrial effluents
  • Thermal-energy-driven technologies such as membrane distillation and humidification dehumidification are considered to be promising for such brine concentration applications as they can operate at ambient pressure and relatively low temperatures
  • These brine concentration applications are characterized by a high recovery ratio requirement
  • (b) Flux as a function of number of stages. Both GOR and flux of multistage recirculation approach that of a batch system as the number of stages increases. This is because multistage recirculation performs in space what a batch system does in time, i.e., it treats water at a range of feed salinity levels between 70 and 260 g/kg, unlike single-stage continuous recirculation
  • Batch operation achieves higher GOR at a given flux than semibatch and continuous recirculation because the batch system operates at lower feed salinity levels for a larger fraction of its total cycle time
  • The relative advantage of batch over the other designs is most signficant for high inlet feed salinity and high recovery ratio
  • The change-over time between operating cycles of the batch process must be minimized for efficient use of the available membrane area

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