Abstract
Pretreatment of seawater with UF membranes was tested by a continuous 600 h operation. The module was a plate and frame type with polyacrylonitrile membranes of 20,000 molecular weight cut-off. Permeate fluxes decreased rapidly in the first 60 h and did very slowly after 200 h. The decrease was due to accumulation of fouling colloid substance on membrane surface which contains Si, Fe, Al, etc. The SDI of the treated seawater was always kept less than 3, in spite of sudden increase in MF value of the feed. No definite conclusion has not drawn yet, but low permeability of membrane and a small ratio of permeate to the recycling feed, suggest that reduction of power consumption will be a big problem to a UF membrane pretreatment process.
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