PURIFICATION OF OIL POLLUTED WATER

摘要

PROBLEM TO BE SOLVED: To provide an oil polluted water purifying method employing a menabrane filtering method hard to generate the fouling of a membrane by oil and suppressed in the lowering of flux based on fouling. SOLUTION: Oil polluted water is filtered by using a porous membrane having a fractionation mol.wt. of 70,000 or more and a pore size less than 0.1μm and characterized by that the contact angle of the surface on the contact side with oil polluted water of the membrane with water is pref. 0-60 deg..