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This paper used the synthetic drainage which can make a BOD/N ratio high and can proliferate a filamentous organisms intentionally. The electrolysis activated sludge method was adapted to the bulking state by generating of a filamentous organisms, examination was advanced, and the effect by the kind (DC and AC) of turning on electricity was also examined. As a result, the following knowledge was acquired. 1) It was admitted that prevention of bulking was a solution with an effective electrolytic method which uses an iron electrode. 2) T-Fe/MLSS When the rate of a ratio of concentration became 4% or more, it was accepted that a T-P removal rate becomes 70% or more. 3)It was suggested to CODcr removal that either of the condensation effects by whether the current has influenced the activity of a organisms and the iron ion which carries out elution exists. 4) Compared with the AC, the amount of iron ion elution carried out elution of DC twice. 5) It was admitted that the influence which gives this method to the filamentous organisms in turning on electricity because it is adapted was great.

Recently, the accidents caused by Legionella species have became a serious problem at public baths. To solve the problem, it is necessary to keep the residual chlorine in water at predetermined level by disinfectant. In this study, we aimed to understand the situation of chlorine disinfectant decrease in air bubble bath and ultrasonic bathtub. As the experiment conditions, we controlled to change water depth, amount of air, water temperature, volume of circulating water, gauge of air nozzle, and so on. In order to evaluate the behavior of disinfectant in water, the divergent coefficient was used to observe the decrease in the level of disinfectant over time. Regarding of the behavior of disinfectant in water in the bubble air bathtub and Whirlpool bathtub, the results were obtained respectively.