Title:
FILTER SAND WASHING METHOD AND ITS SYSTEM
Document Type and Number:
WIPO Patent Application WO/2002/036239
Kind Code:
A1
Abstract:
When backwashing a rapid filter (1) where water is washed with filter sand, a preset amount of filter sand (5) is sucked from the rapid filter (1) by a pump (2). The sucked filter sand (5) is fed to a sand washing device (3) where the contaminants on the filter sand are removed. Contaminants-removed filter sand (6) is kept in a washed-sand stock tank (4), and stored filter sand (7) is returned to the rapid filter (1) when the rapid filter is backwashed. An automatic washing of filter sand in the rapid filter is possible by repeating the steps of sucking, washing and returning filter sand, whereby a sand washing function is regenerated by a washing method other than surface washing and backwashing to thereby drastically prolong a regenerating cycle of a filter pond.
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| JP2004344875 | FILTERING METHOD AND FILTERING DEVICE |
Inventors:
SAITO YASUHIRO (JP)
Application Number:
PCT/JP2000/007764
Publication Date:
May 10, 2002
Filing Date:
November 06, 2000
Export Citation:
Assignee:
NIHON GENRYO CO LTD (JP)
SAITO YASUHIRO (JP)
SAITO YASUHIRO (JP)
International Classes:
B01D24/02; B01D24/00; B01D24/46; B01D29/62; B01D41/02; (IPC1-7): B01D41/02; B01D24/00
Foreign References:
| JP2000229205A | 2000-08-22 | |||
| JPS62186911A | 1987-08-15 | |||
| JPS5678684A | 1981-06-27 | |||
| US5401397A | 1995-03-28 |
Attorney, Agent or Firm:
Yanagida, Masashi (Shin-Yokohama KS Bldg. 3-18-3 Shin-Yokohama Kohoku-ku, Yokohama-shi Kanagawa, JP)
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