Kabushiki Kaisha Toshiba

Futoshi Kurokawa

Takeshi Matsushiro

Koichi Matsui

Katsuya Yokokawa

Ryo Namba

Hideaki Yamagata

Seiichi Murayama

Kie Kubo

Kenji Taguchi

Kotaro Iyasu

Shojiro Tamaki

Nobuyoshi Kaiga

Masao Kaneko

Akira Hiramoto

Takumi Hayashi

Norimitsu Abe

Kyosuke Katayama

Atsushi Yukawa

Takashi Menju

Kazuyoshi Aoki

Yasushi Yamamoto

Tokusuke Hayami

Ryoichi Arimura

Mii Fukuda

Hiroyuki Tokimoto

Takanori Fukagawa

Yuka Hiraga

Kazuhiko Kimijima

According to one embodiment, a membrane filtration system includes a raw water tank, a pretreatment membrane module, a raw water feed line, a high-pressure RO membrane module, a high-pressure line, a preceding power recovery unit which pressurize the pretreated water by transmitting the pressure of the concentrate to the pretreated water, a succeeding power recovery unit which pressurize the raw water by transmitting a remaining pressure of the concentrate to the raw water, a concentrate discharge line, a first pressure transmission line communicating to the power recovery unit by being branched from the high-pressure line, a second pressure transmission line communicating to the power recovery unit by being branched from the raw water feed line, and a valve provided in the drain line to regulate a discharge of the concentrate from the power recovery unit in accordance with a pressure loss in the pretreatment membrane module.

Membrane filtration system

According to one embodiment, a seawater desalination apparatus includes a pressure sensor configured to measure a pressure of seawater which is supplied to a reverse osmosis membrane that is configured to separate seawater into fresh water and condensed seawater and to discharge the fresh water and the condensed seawater, a sensor configured to measure a flow amount of the fresh water which is discharged from the reverse osmosis membrane, a sensor configured to measure a flow amount of the condensed seawater discharged from the reverse osmosis membrane or a flow amount of the seawater discharged from a booster pump, a sensor configured to measure a flow amount of the seawater which is supplied to a power recovery device, and a controller configured to execute control based on values measured by the sensors.

Seawater desalination apparatus

According to one embodiment, a seawater desalination plant system includes a plant unit that produces fresh water from seawater. The seawater desalination plant system predicts quality of seawater for each predetermined time (for example, 1 hour) for a certain definite period (for example, 24 hours) based on a past actual measurement value of quality of seawater; creates a plurality of proposed plans of fresh water production quantity during the definite period in each of which fresh water production quantity required for the definite period is allotted to the each predetermined time; calculates, with respect to the proposed plans, electric power consumption rates for desalination using the predicted quality of seawater, the fresh water production quantity and a previously obtained recovery rate; and obtains an optimum plan of fresh water production quantity with a minimum electric power consumption rate from the proposed plans.

Seawater desalination plant system

According to one embodiment, a seawater desalination system includes a membrane filtering pump, a first to third flowmeter, a filtering membrane, a high-pressure pump, a pressure gauge, a reverse osmosis membrane, a discharge valve and a control module. The membrane filtering pump outputs seawater according to a first control signal. The first flowmeter measures flow rate Q. The high-pressure pump outputs filtered water from the filtering membrane according to a second control signal. The first pressure gauge measures pressure P. The reverse osmosis membrane desalinates the filtered water into fresh water. The second flowmeter measures flow rate Q. The third flowmeter measures flow rate Q. The discharge valve discharges a high-concentration salt water according to a third control signal. The control module performs first, second, and third flow rate control with reference to the flow rate Q, Qand Qand the pressure P

Seawater desalination system

According to one embodiment, a apparatus includes a controller configured to obtain values measured by a first sensor and a second sensor, receive pH target values at the entrance of a first reverse osmosis membrane and at the entrance of a second reverse osmosis membrane, and use a transfer function from the acid injection to pH at the entrance of the first reverse osmosis membrane, a transfer function from the alkaline injection to pH at the entrance of the first reverse osmosis membrane, a transfer function from the acid injection to pH at the entrance of the second reverse osmosis membrane, and a transfer function from the alkaline injection to pH at the entrance of the second reverse osmosis membrane, to control an injection rate of the acid injected from a first injection device and an injection rate of the alkali injected from a second injection device.

Seawater desalination apparatus and chemical injection apparatus

An activated carbon adder adds activated carbon to raw water before flocculating sedimentation, to adsorb suspended matter contained in raw water, a liquid cyclone is adapted to separate activated carbon with suspended matter adsorbed thereon, from raw water containing activated carbon, an inflow line is connected with the liquid cyclone so as to cause raw water containing activated carbon before flocculating sedimentation to flow into the liquid cyclone and swirl therein, an activated carbon discharge line discharges activated carbon spun down out of raw water containing activated carbon in the liquid cyclone, from the liquid cyclone, and a pretreated water discharge line discharges raw water having got rid of activated carbon as pretreated water from the liquid cyclone, allowing for a reduced amount of chemicals to be used, with production of a reduced amount of sludge.

Solid-liquid separator

A water treatment control system for minimizing trihalomethane formation includes chlorine injection equipment having a plurality of chlorine injectors (), a fluorescence analyzerprovided on the upstream of the chlorine injectors, and a water flowmeterAn chlorine injection rate necessary to reduce a trihalomethane formation potential is calculated by a chlorine injection rate calculating apparatusbased on a measured value from the fluorescence analyzerAn chlorine injection amount from the chlorine injectors is controlled by chlorine injection amount control apparatusesbased on the chlorine injection rate and a measured value from the flowing water flowmeter

Water treatment control system for minimizing trihalomethane formation

A water treatment control system using a fluorescence analyzer includes an activated carbon injection equipment having an activated carbon injector , a fluorescence analyzer provided on the upstream of the activated carbon injector , and a flowing water flowmeter An activated carbon injection rate necessary to reduce a trihalomethane formation potential is calculated by an activated carbon injection rate calculating apparatus based on a measured value from the fluorescence analyzer An activated carbon injection amount from the activated carbon injector is controlled by an activated carbon injection amount control apparatus based on the activated carbon injection rate and a measured value from the flowing water flowmeter

Water treatment control system using fluorescence analyzer

Growing community of inventors

Tachikawa, Japan

Futoshi Kurokawa