| 摘要 |
PURPOSE:The titled apparatus, constituted so as to be cleaned by such a mechanism that a raw water inflow and sewage outflow part in combination is provided to the upper part in a reticulated rotary drum having a filter material mounted therein arranged in a water tank while an outflow part having a filtering surface to the lower part thereof and the filtering surface is washed by reversely flowing the filtrate to discharge the fine dust in raw water as sewage. CONSTITUTION:Raw water sent in by a pump 7 is flowed into the upper space of a rotary drum 5 rotated by a motor 42 from a first water flowing part 7 through a first water flowing pipe 8. The flowed-out water is passed through a filter material 3 moving while forming a surface of angle of repose by rotation and purified by a filtering surface 15 to be flowed out to a third water distributing pipe 23 from a second water flowing part 9 through a second flow pipe 10. In this case, the supernatant water of the raw water is also flowed out to the water distributing pipe 23 from a water flooding port 18 by the opening degree of a valve 33 or the passing degree of the filtering surface. In washing, the purified water of a fourth water distributing pipe 4 is reversely flowed to rinse the filtering surface 15 and to wash a filter material 3 while sewage having fine dust mixed therein is flowed to a second water distributing pipe 22 from the first flow part 7 and a sewage discharge port 19. By this method, the filtering surface is rinsed by extremely simple change-over and water purification can be continued.
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