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This paper reviews briefly a specific application oriented product research and development program for making tubular cellulose acetate reverse osmosis membranes suitable for ultrafiltration treatment of oily wastewaters arising in automotive and similar industries. Details of production, specification, and typical performance of such membranes are given. A commercial version of the membranes developed is currently available as Electrohome ultrafiltration modules. These modules show an average permeate productivity of 1.22 m3/m2 day (30 gat/ft2 day) at a mean operating pressure of about 345 kPag (~50 psig) with an oil concentration in the range 5 to 35% on the feed side of membrane in the entire module; the permeate water contains less than 1 % of solute (emulsifiers and washing chemicals), with practically no oil. Based on savings arising from oil recovery and water reuse, the payback time for ultrafiltration units involving the above modules could be as low as six months.

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