Mitsubishi Heavy Industries Engineering, Ltd.

Aqua Systems Limited

Naikai Salt Industries Co., Ltd.

Mitsubishi Heavy Industries Limited

Masayuki Tabata

Katsunori Matsui

Yoshiaki Ito

Kiichi Tokunaga

Hideo Iwahashi

Hideo Suzuki

Masaki Ishiguro

Seiji Furukawa

Kazuhisa Takeuchi

Shigeru Yoshioka

Gaku Kondo

Takeshi Yasunaga

Hidemasa Kakigami

Yuta Hashimoto

Masahiro Kishi

Yasuhide Gouda

This water treatment system is provided with: a reverse osmosis membrane device; a biofilm treatment device that has a carrier, on a surface of which is formed a biofilm, and that treats water to be treated before the water to be treated is transmitted through the reverse osmosis membrane device; and at least one of a water to be treated stoppage period circulation means and a water to be treated stoppage period supply means that are driven when the intake of new water to be treated is stopped. The water to be treated stoppage circulation means supplies and circulates water to be treated from a water to be treated discharge outlet side of the biofilm treatment device to a water to be treated supply port side. The water to be treated stoppage period supply means supplies new water to be treated to the biofilm treatment device.

Water treatment system

A suspended-matter removing method and a suspended-matter removing apparatus are disclosed that require no sludge treatment facility, and inexpensively provide filtrate satisfying a water quality standard. The suspended-matter removing method includes: feeding a protrusion element to a filter layer formed by filling a solid filter material, adding a protrusion to a surface of the solid filter material; after feeding protrusion element, determining whether a protrusion has been added to the surface of the solid filter material, and when it is determined that the protrusion has been added, reducing a feeding amount of the protrusion element as compared with when adding the protrusion; forming a biofilm on the surface of the solid filter material; and passing water to be treated containing suspended matters through the filter layer having the solid filter material added with the protrusion in a state in which the feeding amount of the protrusion element is reduced.

Suspended-matter removing method utilizing biofilm and suspended-matter removing apparatus utilizing biofilm

An object is to provide a pretreatment device of seawater capable of growing and maintaining a biofilm in a good state on each of a plurality of filters connected in series, by supplying nutrients appropriately to the filters. A pretreatment device of seawater is used in removing salt from the seawater to obtain freshwater, and includes: a supply duct () through which the seawater is to be supplied; a plurality of filters () including a particulate filtering material and a biofilm; connecting tubes () which connect the plurality of filters in series; a plurality of bypass tubes () each of which connects corresponding one of the plurality of filters to the supply duct; and a plurality of regulating valves () each of which is disposed in corresponding one of the plurality of bypass tubes to regulate a flow rate.

Seawater pretreatment device

A reverse osmosis membrane filtering device includes: a water-collecting member including at least one water collecting pipe, and having a plurality of sections each of which has a plurality of water collecting apertures; at least one filter assembly disposed around the plurality of sections, the at least one filter assembly including a filter member including a reverse osmosis membrane; at least one insertion tube disposed inside the water-collecting member and defining a plurality of permeate-water channels corresponding to the plurality of sections inside the water-collecting member in cooperation with at least one seal member; and a pressure adjusting device configured to increase a pressure of at least one of the plurality of permeate-water channels to a pressure higher than that of another one of the plurality of permeate-water channels.

Reverse osmosis membrane filtering device

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Tokyo, Japan

Masayuki Tabata