Low-cost tubular and capillary polyethersulphone ultrafiltration modules have been developed and their use in the pretreatment of seawater for reverse osmosis desalination investigated. Mechanical and chemical cleaning regimes were evaluated for the restoration of the productivity of fouled membranes. The cost-effectiveness of using these UF membranes for pretreatment to RO, was found to depend on a combination of membrane configuration, type and frequency of cleaning regime and average productivity.

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