BIOLOGICAL REACTION TANK

摘要

PROBLEM TO BE SOLVED: To equalize the residence time of the water to be treated in a tank according to the changes in the inflow amount of the water. SOLUTION: In the biological tank 10 to treat the objective water by the biological effect of microorganisms held in a tank while the water continuously flowing in from a conduit 22 is controlled to an almost constant water level, the amount of the objective water reserved in an immersion body 18 is adjusted based on the moving average of the inflow amount of the water so as to control the volume of the submerged part of the body 18 in such a manner that the residence time of the objective water in the tank is constant.