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Kurita Water Industries Ltd patents


Recent patent applications related to Kurita Water Industries Ltd. Kurita Water Industries Ltd is listed as an Agent/Assignee. Note: Kurita Water Industries Ltd may have other listings under different names/spellings. We're not affiliated with Kurita Water Industries Ltd, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "K" | Kurita Water Industries Ltd-related inventors


Scale remover in steam generating facility

A scale remover that efficiently removes scale deposited inside a boiler without corroding a boiler includes polyacrylic acid and polymethacrylic acid and/or salts thereof.. . ... Kurita Water Industries Ltd

Flocculation monitoring apparatus, flocculation monitoring method, and flocculation system

A flocculation monitoring apparatus and a flocculation monitoring method are provided, and the flocculation monitoring apparatus and the flocculation monitoring method are capable of stably measuring a flocculation state of water to be treated even when the number (density) of flocs has increased. A measurement-light applying part (laser-light applying part 10) applies a measurement light to a measurement region (18) in the water to be treated (8) and a scattered-light receiving part (12) receives a scattered light due to particles of the water to be treated. ... Kurita Water Industries Ltd

Agent, liquid, and method for cleaning reverse osmosis membrane

An agent for cleaning an ro membrane, which includes an aldonic acid and/or a salt of an aldonic acid, removes effectively foulants that cannot be sufficiently removed with conventional cleaning agents when an ro membrane used for water treatment. In a method for cleaning an ro membrane with the cleaning agent or the cleaning liquid, while the detachment and hydrolysis effects are achieved by performing cleaning under alkaline conditions, chelation of heavy metals is caused by the aldonic acid and/or the salt of an aldonic acid. ... Kurita Water Industries Ltd

Recovery method and recovery device for discharged cooling water

Water discharged from a circulating cooling water system is treated by a water recovery system including a clarification equipment and an ro membrane, and treated water is returned to the circulating cooling water system. A dispersant is added to the circulating cooling water system for dispersing scale components. ... Kurita Water Industries Ltd

Agent, liquid, and method for cleaning reverse osmosis membrane

Provided is a cleaning agent capable of preventing a reduction in the rejection rate of an ro membrane which may occur when the membrane is cleaned, the cleaning agent including a membrane protectant that is a basic or hydrophobic amino acid, a peptide containing the amino acid as a constituent amino acid, or a derivative of the amino acid or the peptide. The cleaning agent may further include at least one agent selected from the group consisting of an alkaline agent, a combined chlorine agent, and an oxidizing agent. ... Kurita Water Industries Ltd

Electrolysis apparatus and water treatment method

Provided is an electrolysis apparatus with which the liquid that is to be treated can be continuously electrolyzed with high efficiency under high-temperature and high-pressure conditions. The electrolysis apparatus includes a cylindrical container main body including an inner peripheral surface serving as a cathode surface, an anode plate disposed in the container main body along an axis thereof, and end members attached to the respective ends of the container main body with nuts interposed therebetween, respectively. ... Kurita Water Industries Ltd

Method and apparatus for measuring concentration of oxidant and system for cleaning electronic material

To measure the concentration of an oxidant in an oxidative cleaning liquid used in a process of cleaning an electronic material in a simple, easy, consistent, and accurate manner without being affected by impurities included in the cleaning liquid, such as metals. A method for measuring the concentration of an oxidant in a sample liquid used as a cleaning liquid in a process of cleaning an electronic material includes decomposing at least part of an oxidant included in the sample liquid by heating or the like; measuring the amount of oxygen gas generated by decomposition of the oxidant; and determining the concentration of the oxidant in the sample liquid on the basis of the amount of the oxygen gas.. ... Kurita Water Industries Ltd

Electrodeionization device and pure-water production system

An electrodeionization device having an improved boron rejection capability compared with high-performance electrodeionization devices proposed in the related art is provided. An electrodeionization device comprising a cathode; an anode; and a plurality of cation-exchange membranes and a plurality of anion-exchange membranes, the plurality of cation-exchange membranes and the plurality of anion-exchange membranes being arranged between the cathode and the anode so as to form concentrating compartments and desalting compartments, the concentrating compartments and desalting compartments being arranged alternately, the desalting compartments being filled with an ion-exchange resin, wherein the ion-exchange resin has an average particle size of 100 to 300 μm. ... Kurita Water Industries Ltd

Ultrapure water production apparatus and ultrapure water production method

The present invention provides an apparatus and method for producing ultrapure water of extremely high purity that sufficiently meets the requirement for its quality at low production cost with reduced footprint. The apparatus for producing ultrapure water includes a pretreatment system, a primary water purification system, and a subsystem, wherein the primary water purification system includes a high-pressure reverse osmotic membrane separation unit, a degassing unit, an ultraviolet oxidation unit, and an ion-exchange unit in this order.. ... Kurita Water Industries Ltd

Cleaning agent, cleaning liquid, and cleaning method for reverse osmosis membrane

Provided are a cleaning agent and a cleaning liquid that prevent a reduction in the rejection rate of an ro membrane which may occur when the ro membrane is cleaned and a method for cleaning an ro membrane with the cleaning liquid. The agent for cleaning an ro membrane includes a urea derivative. ... Kurita Water Industries Ltd

Ultrapure water producing method

A method for producing ultrapure water includes supplying raw water (industrial water, tap water, well water, or used ultrapure water discharged from semiconductor plants) to a pretreatment system for treating the raw water to produce water, supplying the water to a primary water purification system having a reverse osmosis membrane separation unit to produce a primarily purified water, and supplying the primarily purified water to a secondary purification system to produce ultrapure water.. . ... Kurita Water Industries Ltd

Method and apparatus for producing pure water

Provided are a method and an apparatus for producing pure water in which water that has been subjected to an ultraviolet oxidation treatment performed with an ultraviolet oxidation device is brought into contact with a platinum-group metal catalyst, the method and apparatus eliminating the likelihood of the catalyst being degraded and enabling decomposition of hydrogen peroxide to be performed for a prolonged period of time in a consistent manner. Water-to-be-treated is subjected to an ultraviolet oxidation treatment performed with an ultraviolet oxidation device and subsequently subjected to a hydrogen peroxide removal treatment performed with a hydrogen peroxide removal device including a platinum-group metal catalyst. ... Kurita Water Industries Ltd

Method for treating ballast water

This method entails: collecting in advance untreated ballast water to which a chlorine-based active substance has not been added; measuring in advance the turbidity of the untreated ballast water; and adding a chlorine-based active substance with an adding amount determined on the basis of the turbidity. The amount of the chlorine-based active substance to be added is set according to the turbidity such that the concentration of total residual oxidants (tro) is 0.5-3 mg/l (ascl2) when the ballast water is discharged.. ... Kurita Water Industries Ltd

Reverse-osmosis-membrane device and method for operating the same

Provided are reverse-osmosis-membrane device capable of treating raw water including a large amount of membrane foulants, such as mbr-treated water, with stability while preventing a reduction in the amount of permeate, and a method for operating the reverse-osmosis-membrane device. The raw water includes a high-molecular organic substance having a molecular weight of 10,000 or more at a concentration of 0.01 ppm or more. ... Kurita Water Industries Ltd

08/03/17 / #20170217808

Biological treatment method and biological treatment apparatus

Provided is a biological treatment method and an apparatus that allow organic wastewater from a manufacturing process of electronic devices to be neutralized efficiently during its biological treatment with a less neutralizer in contrast to excessive use thereof in the conventional biological treatment and thereby make it possible to reduce an amount of an inorganic coagulant used in the downstream coagulation step and to reduce salt loads in ro membrane separation and ion exchange treatment. Wastewater from a process of manufacturing electronic devices is passed sequentially through two or more biological treatment tanks that include at least two aerobic biological treatment tanks including the final-stage aerobic biological treatment tank while adding a neutralizer to the biological treatment tank or tanks except the final-stage biological treatment tank so that an m-alkalinity of the liquid in the final-stage biological treatment tank is maintained at not more than 50 mg/l as caco3.. ... Kurita Water Industries Ltd

07/27/17 / #20170210645

Agent for treating water circulating through wet paint booth and method for treating water circulating through wet paint booth

Provided is an agent for treating water circulating through a wet paint booth, the agent being capable of reducing the adhesion of a solvent-based paint and coagulating a solvent-based paint to a sufficient degree regardless of the type of the paint, the type of the curing agent used, or the facility conditions, the agent also being capable of markedly reducing the foaming of a water-based paint, even when being used in a small amount. An agent for treating water circulating through a wet paint booth includes a phenolic resin having a weight-average molecular weight of more than 3,000 and 100,000 or less, the phenolic resin serving as an active component. ... Kurita Water Industries Ltd

07/13/17 / #20170197852

Method and system for treating circulating water circulating through wet paint booth

An adequate control of a ph of circulating water circulating through a wet paint booth enables an efficient coagulation treatment of a paint included in the circulating water. A method for treating circulating water circulating through a wet paint booth and including a paint includes treating the paint included in the circulating water by adding an alkaline solution of a phenolic resin to the circulating water, and adjusting a ph of the circulating water to 6.5 to 8.0. ... Kurita Water Industries Ltd

06/01/17 / #20170153216

Facility management system

A facility management system quickly creates information required for maintenance or the like of a water treatment facility, after water is sampled at the water treatment facility. The facility management system includes a management center including an operation database in which information indicating an operating status of a water treatment facility is stored, a portable water quality analyzer configured to perform water quality analysis on water taken from the water treatment facility, and a communication apparatus configured to acquire an analysis result from the portable water quality analyzer and wirelessly transmit the analysis result. ... Kurita Water Industries Ltd

05/04/17 / #20170121190

Method for treating water containing low-molecular-weight organic substance

Provided is a method for treating water containing a low-molecular-weight organic substance which enables the low-molecular-weight organic substance to be removed with certainty at a sufficient level without subjecting the water to a biological treatment. A method for treating water containing a low-molecular-weight organic substance, the method comprising passing raw water to a high-pressure reverse-osmosis-membrane separation device, the raw water containing a low-molecular-weight organic substance having a molecular weight of 200 or less at a concentration of 0.5 mgc/l or more, wherein an amount of brine discharged from a reverse-osmosis-membrane module (5a) disposed at an end of a final stage of the high-pressure reverse-osmosis-membrane separation device is 2.1 m3/(m2·d) or more.. ... Kurita Water Industries Ltd

04/27/17 / #20170114501

Use of zirconium-containing additive compositions

The invention relates to the use of an additive composition in the form of an aqueous solution or dispersion having a solids content in the region of 5 to 75% in wt. With respect to the total weight of the additive composition, obtained according to a method consisting of mixing the components a) and b) in an aqueous medium, wherein a) is selected from sodium zirconium carbonate, potassium zirconium carbonate, ammonium zirconium carbonate and mixtures thereof, b) is selected from at least one ortho-phosphate, at least one condensed phosphate, salts thereof and mixtures as additives in starch glue.. ... Kurita Water Industries Ltd

04/20/17 / #20170107126

Dispersant for water treatment and water treatment method

An object of the present invention is to provide a dispersant for treatment of water. The dispersant is used in a membrane separation process of water containing an organic compound having a phenolic hydroxy group and prevents a reduction in amount of the water permeating a separation membrane, which is caused by deposition of the organic compound onto the surface of the separation membrane. ... Kurita Water Industries Ltd

03/30/17 / #20170089860

Residual chlorine measuring apparatus and method of measuring residual chlorine

A residual chlorine measuring apparatus includes: a detection electrode that is immersed in a sample solution, the detection electrode being made of gold or platinum; a counter electrode that is immersed in the sample solution, the counter electrode being made of silver/silver chloride; a voltage applying device that applies an applied voltage between the detection electrode and the counter electrode; an ammeter that measures an oxidation-reduction current flowing between the detection electrode and the counter electrode; and an arithmetic controller that controls the voltage applying device and acquires the oxidation-reduction current measured by the ammeter.. . ... Kurita Water Industries Ltd

03/23/17 / #20170082591

System and method for calculating concentration of water treatment chemical

A system for calculating a concentration of a water treatment chemical includes a water analyzer, databases storing information regarding a chemical component of the water treatment chemical, a server sending the information stored in the database, and a communication device sending the information acquired from the server to the water analyzer. The water analyzer includes a storage unit storing a calibration curve defining the relationship between the concentration of a chemical component and absorbance, a communication unit receiving the information regarding the chemical component of the water treatment chemical, an irradiation unit irradiating water to be analyzed with light, a detection unit detecting transmitted light, and an arithmetic and control unit calculating absorbance from the result of the detection by the detection unit, acquiring a calibration curve from the storage unit, and calculating the concentration of the chemical component with reference to the acquired calibration curve and the measured absorbance.. ... Kurita Water Industries Ltd

02/23/17 / #20170050873

Method for removing scale and scale remover in steam generating facility

Provided are a method for removing scale and a scale remover that can efficiently remove scale deposited inside a boiler can or the like in an addition amount of chemicals permissible in terms of cost without corroding a boiler, particularly can efficiently remove scale deposited inside a boiler can even in a facility operated with feed water containing high-concentration iron. A method for removing scale deposited in a system of a steam generating facility, wherein polyacrylic acid having a weight-average molecular weight of more than 20,000 and 170,000 or less and/or a salt thereof is added to feed water of the steam generating facility. ... Kurita Water Industries Ltd

02/23/17 / #20170050869

Antimicrobial and algicidal agent for cooling water system

An antimicrobial and algicidal agent for cooling water system contains an antimicrobial agent and an isothiazolone-based compound that effectively kill and remove the algae grown in the cooling water system.. . ... Kurita Water Industries Ltd

02/09/17 / #20170038358

Concentration-factor measurement device, concentration-factor measurement method, and water-quality-index-value measurement method

Provided are a concentration-factor measurement device and method for accurately calculating a concentration factor of circulating water, and a method for measuring a water-quality index value of the circulating water. The concentration-factor measurement device includes a light-absorbance measurement unit (1) for measuring absorbance by irradiating each of cells (12a-12c) with light, and an electrode measurement unit (2) equipped with electrodes (16, 17) that are inserted into a water sample in a container (20). ... Kurita Water Industries Ltd

01/19/17 / #20170018822

Lithium ion battery and electronic device using same

A nonaqueous electrolytic solution lithium ion battery comprises a positive electrode terminal, a negative electrode terminal and a battery case, and an electrode body is contained within the battery case. The electrode body comprises a positive electrode collector, an electrode plate for positive electrodes, a negative electrode collector and an electrode plate for negative electrodes. ... Kurita Water Industries Ltd

01/12/17 / #20170008786

Method and apparatus for treating ammonia-containing water

A method for treating ammonia-containing water containing ammonia, metal ions that form a complex with ammonia, and a reducing substance includes a first step of oxidizing the reducing substance by adding hydrogen peroxide to the ammonia-containing water; a second step of aerating the resultant water treated in the first step to remove the ammonia; a third step of forming an insoluble solid at a ph of 7 to 12 by adding at least one compound selected from the group consisting of iron salts, aluminum salts, calcium salts, and calcium hydroxide to the water treated in the second step; and a fourth step of separating the insoluble solid formed in the third step by solid-liquid separation.. . ... Kurita Water Industries Ltd

01/12/17 / #20170008784

Device and method for controlling chemical injection into boiler

A device for controlling injection of chemical into a boiler and a chemical injection method can control an injection amount such that a chemical concentration is obtained as per a target even in a boiler feed-water facility where a flow rate of feed-water varies to a large extent in a short period. The device controls an amount discharged by a chemical injection pump in proportion to a flow rate measured by a flowmeter. ... Kurita Water Industries Ltd

01/05/17 / #20170001888

Wet paint booth circulating water treatment agent

A method for treating a circulating water in a wet paint booth, the method including adding a treatment agent including an aqueous solution including a tannin and an alkali metal hydroxide and/or an alkali metal carbonate to the circulating water in any of passages for the circulating water in the wet paint booth, wherein the passages include for supplying the circulating water from a water tank to a paint booth, for collecting an uncoated paint in the circulating water, and for returning the circulating water to the water tank; to detackify the uncoated paint collected in the circulating water.. . ... Kurita Water Industries Ltd








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