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It was found in a eutrophic reservoir that the metalimnion became anoxic during the hot season while the hypolimnion became successfully aerated. As countermeasures against deoxygenation of the reservoir metalimnion, performance of three types of aeration systems, i. e. (i) air diffuser system, (ii) air bubbler destratification system and (iii) air bubble jet system, was evaluated by making a numerical analysis of water quality. In the analysis, physical processes such as dissolved oxygen dilution and vertical mixing caused by aeration were taken into consideration in addition to hydrodynamics and biochemical processes regarding to water quality. The system's performance was examined from view points not only of water purification but also of cost-benefit performance. It was found through the analysis that the air bubbler destratification system shows the best performance. System's capacity necessary for the aeration was also discussed.

PLANNING OF AERATION SYSTEM FOR MINIMIZING DEOXYGENATION IN RESERVOIR METALIMNION