METHOD FOR TREATING WASTE WATER CONTAINING HIGH-CONCENTRATION ORGANIC MATTER AND DEFOAMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a defoaming apparatus in which the securement of a large quantity of dissolved oxygen necessary for activity of a microbe and the prevention of a large quantity of bubbles form being generated by an aerating operation are satisfied at the same time when waste water containing high-concentration organic matter is treated in a short time by an activated sludge method.

SOLUTION: A large quantity of dissolved oxygen in water is secured by using a medium-depth aeration tank and/or a high-concentration oxygen aeration tank. A draft tube 2 having an aeration wheel 3 at the bottom is arranged in the centers of one or both of the above-mentioned aeration tanks and the liquid to be treated is circulated by rotating the aeration wheel so that a downward flow is formed on the inside of the draft tube and an upward flow is formed on the outside of the draft tube. A large quantity of bubbles to be generated by the aerating operation are collected in the draft tube and annihilated by the aeration wheel at the bottom of the draft tube.

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