METHOD AND APPARATUS FOR TREATING WASTE WATER AFTER WASHING

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for treating waste water after washing, by which a contaminant contained in the waste after washing discharged from nuclear facilities is not only lowered to be below the discharge regulation value satisfactorily but also the waste water after washing is made harmless for reusing as treated water. SOLUTION: The waste water 1 after washing is made harmless by acclimating the water 1 with activated sludge in a biological treating tank 2, mixing the water 1 with the activated sludge in an innutritious state by aeration and subjecting the mixture to solid-liquid separation by using a micro-filtration membrane 3. The aeration is carried out by jetting air 5 from an air diffusing pipe 6 arranged just under the membrane 3. Another air diffusing pipe can be arranged at a position where the jetted air does not hit the membrane 3 directly.