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IMPROVING THE QUALITY, AVAILABILITY AND SUSTAINABILITY OF DRINKING WATER SUPPLIES THROUGH ANTIFOULING AND ANTISCALING DESALINATION MEMBRANES
Impact/Purpose:
The objective of this research is to advance membrane desalination technology by reducing the fouling and scaling propensity of thin-film composite desalination membranes through surface modification. Modifying the membrane surface layer to increase the hydrophilicity and decrease the roughness will impart biofouling and scaling resistance by reducing both the attachment of bacteria and the surface crystallization of inorganic precipitates.
Description:
Surface modification with the selected polymers is expected to reduce the fouling and scaling propensity of desalination membranes by strongly binding water at the membrane surface. Foulants will interact with this bound water layer and not with the membrane surface itself. Reductions in the irreversible attachment of bacteria, an important step in biofilm formation, and the surface crystallization of inorganic precipitates are expected. Some tradeoffs between improved fouling and scaling resistance of the modified membranes and reduced membrane water permeability and salt rejection are anticipated. This work will contribute to an understanding of how the surface modification techniques and conditions affect membrane transport properties.
Potential to Further Environmental/Human
Health Protection
Fouling and scaling resistant membranes will improve the sustainability
and reduce the costs of desalination by improving membrane
performance, reducing cleaning frequency and intensity, and extending
membrane life. Lowering these barriers to implementing membrane
desalination technology can help alleviate water quality and water supply
problems for communities in diverse geographic areas. Implementing
desalination also reduces stress on existing freshwater supplies so that
they may be preserved for ecosystem benefits.