JPS6434417A - Drainage purifying equipment - Google Patents

Abstract

PURPOSE:To accurately purify drainage, to eliminate deposition of settled materials and to simplify washing operation of individual panels by arranging a plurality of filter panels on the bottom face herein the height of one part is gradually lowered toward the outflow port side in a filtration tank. CONSTITUTION:The bottom face constructed in the manner that the height is gradually lowered toward the outflow port 5 side, e.g. a stepped bottom face 15, is formed in one part of the bottom face 2e of a filtration tank 2, and a plurality of filter panels 16 detachably fitted to the inside of the filter tank 2 are arranged on the bottom face 15 and also on the horizontal bottom face 18 connected with the bottom face 15. As a result, while water to be treated which is introduced into the filtration tank 2 from the inside of a feed tank 1 is successively purified with respective panels 16, it is successively flowed down on the bottom faces 15, 18 and discharged through the outflow port 5 and also oil and fine particles such as organic solid materials contained in the water to be treated are fluidized together therewith and collected on the filter faces of respective panels 16 and therefore such trouble that uncollected fine particles are settled and deposited on each part on the bottom face 2e can be eliminated.