Hitachi, Ltd.

Tokyo Gas Company Limited

Masayuki Matsuura

Kotaro Kitamura

Yusuke Okawa

Takanori Oshikiri

Hiroki Miyakawa

Hiroaki Tanaka

Shinichi Yoshikawa

Kiyoji Uehara

Hideo Tai

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

A gas detection device employs a tunable wavelength laser, modulated about an absorption line of a gas to be detected. By measuring the ratio of the fundamental to the second harmonic of the modulation frequency, the detection is independent of the optical path length. This permits an aimable device in which a laser beam is directed toward a remote surface, reflected thereby, and the reflected beam focused upon a detector. The presence of the gas to be detected in the space between the device and the reflective surface is thereby determined.

Gas detection device

Growing community of inventors

Tokyo, Japan

Masayuki Matsuura