JPS5628617A - Moving bed type filtration method - Google Patents

Abstract

PURPOSE: To easily regenerate filter media by charging the filter media drawn continuously from the bottom of a filter barrel into a filter media regenerating and separating barrel and washing the filter media by using part of filter water by the water pressure generated by giving resistance to the discharge pipe for the filter water.

CONSTITUTION: The water 3 to be filtered is admitted into a filter barrel 1 from the lower lead-in port 2 of the filter medium 4 layer packed therein. The water to be filtered having risen in the filter layer is removed of SS and is discharged as filter water 5. On the other hand, the stained filter media having been captured of SS is moved upward in a transfer pipe 8 by the air 7 from the bottom discharge port of the filter barrel 1 and while it is accompanying the peeling of SS, it reaches the filter medium regenerating and separating barrel 9 provided on the upper side of the filter layer. In this separating barrel 9, the filter media quickly settle owing to the difference in the rate of sedimentation between the filter media and the SS, thereby forming the continuous bodies of filter medium particles. The free water contg. SS is forced out to the upper side by part of the filter water 5' in which water pressure is generated by partly closing the valve 13 provided to a water discharge pipe 12, thence it is discharged as stained water 10. It is also possible to generate the water pressure by making the discharge pipe for filter water finer or longer.

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