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Title:
LOADING-TYPE MULTI-STAGE FILTRATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/132210
Kind Code:
A1
Abstract:
[Problem] To provide a loading-type multi-stage filtration device capable of improving, with high efficiency, water quality to the level of beverage applications by ensuring sufficient contact time with filtration sand in a space-saving manner. [Solution] A loading-type multi-stage filtration device 100 comprises: a first filtration tank 20 into which rainwater stored in a rainwater tank 10 enters; a second filtration tank 30 that is connected to the lower part of the first filtration tank such that the first filtration tank is stacked thereon; a fresh-water tank 70 that stores purified rainwater filtered by at least the first and second filtration tanks; and a control water tank 80 that receives rainwater from the rainwater tank and that is connected to the fresh-water tank to enable adjustment of the storage capacities of the rainwater tank and the fresh-water tank.

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Inventors:
KOBAYASHI KAZUYOSHI (JP)
GOUDA NORIAKI (JP)
YASUNAKA KENJI (JP)
NISHINAGA TADAYOSHI (JP)
Application Number:
PCT/JP2020/047845
Publication Date:
July 01, 2021
Filing Date:
December 22, 2020
Export Citation:
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Assignee:
FREE WAY LTD COMPANY (JP)
International Classes:
B01D35/147; B01D24/02; C02F1/30; C02F1/32; E03B11/14
Foreign References:
JP2008012408A2008-01-24
JP2003275782A2003-09-30
JP2018001070A2018-01-11
KR20090111055A2009-10-26
JP2005313134A2005-11-10
CN204910909U2015-12-30
Attorney, Agent or Firm:
OHTA PATENT AND TRADEMARK ATTORNEYS (JP)
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