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In order to properly determine oxygen discharge of a micro-bubble aeration system, dissolved oxygen and relating water qualities were measured in an anoxic reservoir hypolimnion. Consumption and loss amounts of the oxygen were estimated by analyzing oxygen balance. It was found that the oxygen loss rate linearly decreases with increasing dynamic stability of thermal stratification. A seasonal dependency of oxygen consumption due to biochemical activities was also obtained from the field dataset. Aeration discharge necessary for keeping the hypolimnion aerobic was estimated by summarizing the analytical results, which provides necessary information for optimizing the system operation. The proposed method for estimation of aeration discharge was expected to minimize both the energy consumption and the system capacity.

AERATION DISCHARGE ESTIMATION WITH CONSIDERATION OF THERMAL STRATIFICATION STABILITY