Title:
SAND SEDIMENTATION SEPARATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2008/065858
Kind Code:
A1
Abstract:
Coarse sand grains and fine sand grains in a raw water are separately removed from the
beginning and are efficiently separated from the raw water. Two sand sedimentation separation
tanks (10) and (20) are disposed upstream and downstream, respectively, in the
flow of a raw water. Each sand sedimentation separation tank has, in an upper
part thereof, a separator (11) or (21) where a raw water is caused to flow through
a spiral channel (13) or spiral channels (23A) and (23B) to thereby separate sand
grains from the raw water by the action of centrifugal force and gravity. Each
separation tank further has, in a lower part thereof, an accumulator (12) or (22)
where the sand grains separated with the separator are settled and accumulated. The
separator of the upstream-side sand sedimentation separation tank has a constitution
in which coarse sand grains are separated by causing a raw water to flow through
the spiral channel at a high velocity. The separator of the downstream-side sand
sedimentation separation tank has a constitution in which fine sand grains are
separated by causing the raw water to flow through the spiral channels at a lower
velocity than in the separator of the upstream-side sand sedimentation separation
tank.
Inventors:
KODAKA SHIROU (JP)
ARIMATSU NARUTO (JP)
HANDA YOSHIKAZU (JP)
ARIMATSU NARUTO (JP)
HANDA YOSHIKAZU (JP)
Application Number:
PCT/JP2007/071475
Publication Date:
June 05, 2008
Filing Date:
November 05, 2007
Export Citation:
Assignee:
MAEZAWA KOGYO (JP)
KODAKA SHIROU (JP)
ARIMATSU NARUTO (JP)
HANDA YOSHIKAZU (JP)
KODAKA SHIROU (JP)
ARIMATSU NARUTO (JP)
HANDA YOSHIKAZU (JP)
International Classes:
B03B5/28; B01D21/01; B01D21/26; C02F1/52
Foreign References:
| JP2001073402A | 2001-03-21 | |||
| JPH04501891A | 1992-04-02 | |||
| JP2005305304A | 2005-11-04 | |||
| JP2001073402A | 2001-03-21 | |||
| JP2005279516A | 2005-10-13 | |||
| DE9116560U1 | 1993-04-22 | |||
| JP2004160415A | 2004-06-10 | |||
| JP2005305304A | 2005-11-04 |
Other References:
See also references of EP 2105204A4
Attorney, Agent or Firm:
ANIYA, Setuo et al. (6-1 Iidabashi 4-chom, Chiyoda-ku Tokyo 72, JP)
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