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Conducting thermal energy to the membrane/water interface for the enhanced desalination of hypersaline brines using membrane distillation

Journal Article · · Journal of Membrane Science
 [1];  [2];  [2];  [3];  [2];  [3];  [4];  [2];  [3];  [3];  [5];  [3];  [2];  [2]
  1. University of California, Los Angeles, CA (United States); UCLA
  2. University of California, Los Angeles, CA (United States)
  3. Colorado School of Mines, Golden, CO (United States)
  4. Hebei University of Technology, Tianjin (China)
  5. National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Membrane distillation (MD) is a membrane-based thermal desalination process capable of treating hypersaline brines. Standard MD systems rely on preheating the feed to drive the desalination process. However, relying on the feed to carry thermal energy is limited by a decline of the thermal driving force as the water moves across the membrane, and temperature polarization. In contrast, supplying heat directly into the feed channel, either through the membrane or other channel surfaces, has the potential of minimizing temperature polarization, increasing single-pass water recoveries, and decreasing the number of heat exchangers in the system. When solar thermal energy can be utilized, particularly if the solar heat is optimally delivered to enhance water evaporation and process performance, MD processes can potentially be improved in terms of energy efficiency, environmental sustainability, or operating costs. Here we describe an MD process using layered composite membranes that include a high-thermal-conductivity layer for supplying heat directly to the membrane-water interface and the flow channel. Here, the MD system showed stable performance with water flux up to 9 L/m2/hr, and salt rejection >99.9% over hours of desalinating hypersaline feed (100 g/L NaCl). In addition to bench-scale system, we developed a computational fluid dynamics model that successfully described the transport phenomena in the system.

Research Organization:
University of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE; Department of Energy
Grant/Contract Number:
EE0008391
OSTI ID:
2397277
Alternate ID(s):
OSTI ID: 1774861
OSTI ID: 1781865
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 626; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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