At Kawasaki City, the “Kawasaki Aqua-promenade Project” is being set up for amenity use of treated sewage in artificial “Seseragi” streams. From fiscal year 1987, an experimental study has been done in order to determine the advanced treatment process to be introduced in the Todoroki Sewage Works (planned water flow 395, 500 m3/d by pure oxygen activated sludge process) required for the implementation of the above project. In this study, a pilot scale experimental system was used on various advanced treatment processes required to achieve the water quality standards for amenity use (for their performance comparison). The results obtained indicate that the biological aerated filter (BAF) combined with ozonation is the optimum process to be introduced to achieve the water quality standards effectively and economically.

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