Abstract: A water treatment system includes a flat plate rotating so as to be partially immersed in a raw water and an imaging device configured to image the flat plate to which microorganisms adhere. The water treatment system further includes a calculator configured to calculate an amount of the microorganisms adhering to the flat plate, a controller configured to control the water treatment system and a lighting device radiating light on the flat plate.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 Q1. The high-pressure pump outputs filtered water from the filtering membrane according to a second control signal. The first pressure gauge measures pressure P1. The reverse osmosis membrane desalinates the filtered water into fresh water. The second flowmeter measures flow rate Q2. The third flowmeter measures flow rate Q3. 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 Q1, Q2 and Q3 and the pressure P1.

Abstract: 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.

Abstract: In a seawater desalination plant system, a seawater quality prediction means predicts quality of seawater for each predetermined time during a certain definite period based on a past actual measurement value of quality of seawater. In addition, an optimum plan calculation means creates a plurality of proposed plans of fresh water production quantity during the definite period in which fresh water production quantity required for the definite period is allotted to the each predetermined time, calculates, with respect to these, an electric power consumption rate for desalination using the seawater quality predicted for the each predetermined time, the fresh water production quantity, and a previously obtained recovery rate, and obtains an optimum fresh water production quantity plan from the plurality of proposed plans of fresh water production quantity based on this. A display means displays the content of this obtained optimum fresh water production quantity plan.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 Q1. The high-pressure pump outputs filtered water from the filtering membrane according to a second control signal. The first pressure gauge measures pressure P1. The reverse osmosis membrane desalinates the filtered water into fresh water. The second flowmeter measures flow rate Q2. The third flowmeter measures flow rate Q3. 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 Q1, Q2 and Q3 and the pressure P1.

Abstract: Certain embodiments provide a desalination system including a desalination plant, a carbon dioxide contacting plant, a carbonate filtering plant, and an electrolysis plant. The desalination plant works to separate raw water into fresh water and high salinity condensed water. The carbon dioxide contacting plant works to bring carbon dioxide into contact with condensed water obtained at the desalination plant, producing carbonates. The carbonate filtering plant works to filter carbonate containing condensed water produced at the carbon dioxide contacting plant, effecting a carbonate removal from condensed water. The electrolysis plant works for an electrolytic treatment of condensed water after the carbonate removal at the carbonate filtering plant to produce a chemical or chemicals for use in the desalination system.

Abstract: According to one embodiment, a membrane filtration system includes a raw water tank, a first tank, a second tank, a nanofiltration membrane module comprises a nanofiltration membrane, and removes the solute from the raw water with a solute removal rate of 1% to 30%, a first pump for supplying the raw water from the raw water tank to the module to cause the raw water to permeate through the membrane and send the water that has permeated through the membrane as a primary water to the first tank, a RO module comprises a RO membrane that further removes the solute from the primary water, and a second pump for supplying the primary water from the first tank to the RO module to cause the primary water to permeate through the membrane and send the water that has permeated through the membrane as a secondary water to the second tank.

Abstract: A water treatment system that performs a water purifying treatment by use of ultraviolet radiation, comprises a front stage ultraviolet radiation device for radiating ultraviolet light in a front stage process in a water purifying treatment process, a rear stage ultraviolet radiation device for radiating ultraviolet light in a rear stage process, and a controller for controlling these ultraviolet radiation devices.

Abstract: A water treatment system that performs a water purifying treatment by use of ultraviolet radiation, comprises a front stage ultraviolet radiation device for radiating ultraviolet light in a front stage process in a water purifying treatment process, a rear stage ultraviolet radiation device for radiating ultraviolet light in a rear stage process, and a controller for controlling these ultraviolet radiation devices.

Abstract: A water-purification pretreatment system removes raw water of suspended solids heavier in specific gravity than water before a water-purification treatment of raw water taken from a water source and the system includes a liquid cyclone configured for raw water to inflow thereto and to be swirled inside thereof to separate from raw water suspended solids heavier in specific gravity tan water, an inflow line connected with the liquid cyclone for raw water to be supplied to the liquid cyclone and configured for raw water being supplied to swirl inside the liquid cyclone, and an outflow line configured for raw water having suspended solids separated therefrom to outflow as pretreated water from the liquid cyclone, allowing for a reduced load on a treatment of solid suspended solids as a water treatment for water purification plants.

Abstract: 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.

Abstract: A water treatment system that performs a water purifying treatment by use of ultraviolet radiation, comprises a front stage ultraviolet radiation device for radiating ultraviolet light in a front stage process in a water purifying treatment process, a rear stage ultraviolet radiation device for radiating ultraviolet light in a rear stage process, and a controller for controlling these ultraviolet radiation devices.