Hitachi, Ltd.

Hitachi Plant Technologies, Ltd.

Toray Industries, Inc.

Yusuke Okawa

Kotaro Kitamura

Yasuyuki Okuno

Masayuki Matsuura

Takanori Oshikiri

Kazuhiko Noto

Hiroki Miyakawa

Hidemi Nagakawa

Shinichi Yoshikawa

Hiroo Takabatake

Naoki Okuma

Kei Hayashida

Provided is a reverse osmosis treatment system capable of simultaneously and efficiently recovering energy generated both at brine and permeate sides. The system comprises a branched portion configured to divide second to-be-treated water into third and fourth to-be-treated water; a high-pressure pump configured to pressurize the third to-be-treated water thereby to feed fifth to-be-treated water having a higher pressure than the to-be-treated water before divided; a displacement type of first energy recovery device configured to exchange pressures between the fourth to-be-treated water and brine thus separated by a reverse osmosis treatment device, thereby to produce sixth to-be-treated water having a higher pressure than the fourth one; and a second energy recovery device configured to raise a pressure of the third to-be-treated water located at a downstream side of the branched portion with a pressure of first permeate thus separated by the reverse osmosis treatment device.

Reverse osmosis treatment system for recovering energy generated both at brine and permeate sides during sea water desalination

Provided is a seawater desalination system including reverse osmosis membrane modules each including: a reverse osmosis membrane; and a pressure vessel installing the reverse osmosis membrane, and configured to obtain permeated water and concentrated water using the reverse osmosis membranes housed in the reverse osmosis membrane modules by supplying seawater to the reverse osmosis membrane modules. The seawater desalination system includes a module group including the reverse osmosis membrane modules connected together in parallel. The seawater is supplied to each of the reverse osmosis membrane modules by being supplied to the module group through first and second seawater supply routes. The first and second seawater supply routes are each provided with a liquid transport pump configured to supply the seawater flowing through the seawater supply route to the module group.

Water treatment system

Reverse osmosis treatment system for recovering energy generated both at brine and permeate sides during seawater desalination

Provided is a fresh water generation system which filters biotreated water produced by microbiologically treating waste water via a primary semi-permeable membrane (), and then mixes concentrated water rejected by the filtration with seawater, thereby to filter the mixed water via a secondary semi-permeable membrane (). This system enables frequencies of chemical cleaning and replacement of the secondary semi-permeable membrane to be reduced. The fresh water generation system comprises: a primary semi-permeable membrane apparatus () which separates microorganism treating waste water into permeated water and concentrated water; a secondary semi-permeable membrane apparatus () which filters mixed water prepared by mixing the concentrated water into seawater. In the fresh water generation system, the primary semi-permeable membrane () has an equal to or a higher microorganism adhesive property than the secondary semi-permeable membrane ().

Fresh water generation system

To present a membrane element in an immersion type membrane separation apparatus capable of filtering efficiently by holding a uniform filtering capacity on the whole of the membrane surface if clogging occurs in a part of the membrane surface. The membrane element A is composed of a filtration chamber forming part C arrayed by dividing filtration chambers into a plurality in a vertical direction, water collecting transverse groove forming parts B forming transverse grooves () for collecting filtered water from each filtration chamber in a lateral direction by connecting with the filtration chamber forming part C, and a water collecting route () by connecting with the water collecting transverse groove forming parts B for collecting the water flaker in the lateral direction from each transverse groove () and discharging to outside.

Membrane element in immersion type membrane separation apparatus

A membrane cartridge in an immersion type membrane separation apparatus capable of suppressing vibrations applied to the membrane cartridge by an ascending force of membrane cleaning gas and others by firmly coupling the adjacent membrane cartridges disposed in parallel. In a membrane cartridge in an immersion type membrane separation apparatus, selvages larger in thickness than a membrane cartridge main body are formed at both sides of the membrane cartridge, and a header forming part is formed on one selvage, and a guide hole is formed in other selvage relatively, and the header forming part and the guide hole of the membrane cartridge disposed adjacently by varying the direction mutually are formed to communicate and connect with each other.

Membrane cartridge in immersion type membrane separation apparatus

Frame for immersion flat filter membrane elements

Immersion flat filter membrane element

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Tokyo, Japan

Yusuke Okawa