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公开(公告)号：US20240067539A1
公开(公告)日：2024-02-29
申请号：US18013901
申请日：2021-09-02
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII , Kunihiro HAYAKAWA , Junichi TAKAHASHI
IPC: C02F1/44
CPC classification number: C02F1/441 , C02F2303/22
Abstract: The present invention is a method for operating a demineralization apparatus provided with a plurality of demineralizing lines arranged in parallel and having demineralizers, the method comprising passing through some of the demineralizing lines water to be treated to produce demineralized water while passing through another demineralizing line(s) dilute water from a dilute water tank to perform washing of the line(s), and returning water used for said washing back to the dilute water tank, and being characterized by, when the water quality of the dilute water is on the high salts concentration side past a predefined value, discharging part of the dilute water so as to let said part join the water to be treated and providing a new supply of dilute water for replenishment.
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公开(公告)号：US20180257038A1
公开(公告)日：2018-09-13
申请号：US15743922
申请日：2016-03-23
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII , Takahiro KAWAKATSU
Abstract: Provided is an agent and a liquid for cleaning an RO membrane to remove effectively foulants that can not be sufficiently removed with conventional cleaning agents when an RO membrane particularly an aromatic polyamide RO membrane has been used for water treatment and has become fouled resulting in degradation of performance such as permeation flux, pressure difference, and salt rejection rate. The agent for cleaning an RO membrane includes an aliphatic amide and/or an aromatic amide. Also provided is a method for cleaning an RO membrane with the cleaning agent or the cleaning liquid. The aliphatic amide and/or the aromatic amide particularly an aliphatic amide and/or an aromatic amide being soluble in water and having a relatively low molecular weight remove effectively foulants adhered on an aromatic polyamide RO membrane.
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公开(公告)号：US20180200678A1
公开(公告)日：2018-07-19
申请号：US15743949
申请日：2016-03-23
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII , Takahiro KAWAKATSU
CPC classification number: B01D65/02 , B01D61/025 , B01D71/56 , B01D2321/164 , B01D2321/168 , C02F1/441 , C02F5/10 , C02F5/12 , C02F2103/08 , C11D1/02 , C11D3/044 , C11D3/2086 , C11D3/37 , C11D7/06 , C11D7/265 , C11D11/0041 , Y02A20/131
Abstract: 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. When an anionic surfactant is used in combination with the aldonic acid and/or the salt of an aldonic acid, the anionic surfactant causes the detachment of foulants. When a polyol having a molecular weight of 1000 or less is used in combination with the aldonic acid and/or the salt of an aldonic acid, the polyol causes wetting and swelling of foulants.
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公开(公告)号：US20250136473A1
公开(公告)日：2025-05-01
申请号：US18836749
申请日：2023-02-02
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII
Abstract: A method for operating a desalting device having a first desalting device and a second desalting device, includes: a normal operation step, in which a water to be treated is supplied to a first desalting device and separated into a first concentrated water and a first desalted water, and the first concentrated water is supplied to a second desalting device and separated into a second concentrated water and a second desalted water; and a dilute water passing operation step, in which a dilute water having a lower concentration than the first concentrated water is passed through the second desalting device before a corrected permeated water amount of the second desalting device decreases.
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公开(公告)号：US20230285903A1
公开(公告)日：2023-09-14
申请号：US18013902
申请日：2021-09-02
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII , Mamoru IWASAKI , Itaru ITO
CPC classification number: B01D65/02 , B01D61/026 , B01D65/08 , C02F1/441 , B01D2317/022 , B01D2319/04 , B01D2321/02 , B01D2321/10 , B01D2321/12 , C02F2303/16 , C02F2303/22 , C02F2301/08
Abstract: A method for operating a desalting device that has a first desalting device and a second desalting device, said method comprising: a normal operation step for supplying to-be-treated water to the first desalting device so as to separate the to-be-treated water into first concentrated water and first desalted water, and supplying the first concentrated water to the second desalting device so as to separate the first concentrated water into second concentrated water and second desalted water; and a recovery operation step for supplying the to-be-treated water to the first desalting device so as to separate the to-be-treated water into the first concentrated water and first permeate water, and passing dilute water having a lower concentration than the first concentrated water through the second desalting device so as to recover desalting performance of the second desalting device.
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Patent Agency Ranking
公开(公告)号：US20210339205A1
公开(公告)日：2021-11-04
申请号：US17281975
申请日：2019-09-30
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII
Abstract: A water treatment chemical for membranes, which contains a polymer compound having a carboxyl group and a sulfo group, preferably a polymer compound represented by formula (1). A membrane treatment method wherein this water treatment chemical for membranes is added to membrane feed water when water to be treated, which contains an organic compound having a phenolic hydroxy group, is subjected to a membrane separation treatment. In the formula, m and n represent molar percentages of respective structural units; (m+n) is 90-100%; and R represents an anionic group containing a sulfo group.
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7.发明申请公开(公告)号：US20200047130A1
公开(公告)日：2020-02-13
申请号：US16485632
申请日：2018-02-28
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII
Abstract: A solution-type water treatment chemical, includes, as one, gluconic acid (salt) and a surfactant having an HLB determined by the following equation (1) satisfying the following equation (2), wherein in a relationship between concentrations of the gluconic acid (salt) and the surfactant and a molecular weight and HLB of the surfactant, the gluconic acid (salt) and the surfactant are contained such that the water treatment chemical does not form a gel or precipitate. HLB=(Σ inorganic value/Σ organic value)×10 (1) Molecular weight>−34.4×HLB+1005 (2)
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公开(公告)号：US20190388840A1
公开(公告)日：2019-12-26
申请号：US16490161
申请日：2017-09-15
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Hidekuni KAMEDA , Kazuki ISHII , Yaozhen CHEN
Abstract: A method for treating water, the method including adding, as coagulants, a polymer compound having a phenolic hydroxyl group and an iron-based coagulant to water to be treated, filtering the coagulated water with a clarification filter, and subjecting the filtered water to a reverse osmosis membrane treatment, wherein the addition of the coagulants is controlled such that a ratio between an addition concentration of the polymer compound having a phenolic hydroxyl group and an addition concentration of the iron-based coagulant is constant.
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9.发明申请公开(公告)号：US20190030489A1
公开(公告)日：2019-01-31
申请号：US16071791
申请日：2016-09-12
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kazuki ISHII
CPC classification number: B01D65/08 , B01D61/025 , B01D61/10 , B01D71/40 , B01D2311/04 , B01D2311/12 , B01D2321/168 , B01D2323/46 , C02F1/441 , C02F5/10 , C02F2303/22
Abstract: Provided is a scale inhibitor for RO membranes which effectively inhibits the precipitation of calcium carbonate in an RO membrane treatment without increasing the phosphorus concentration in effluent and which can be used even in the RO membrane treatment of feed in which high-M-alkalinity concentrate having a calcium hardness level of 100 to 600 mg/L-CaCO3 and an M alkalinity of 1000 to 16000 mg-CaCO3/L is produced. A scale inhibitor for reverse osmosis membranes which inhibits the formation of calcium carbonate scale in an RO membrane treatment, the scale inhibitor including components (A) and (B) below. An RO membrane treatment method including adding the scale inhibitor for RO membranes to RO feed. Component (A): Terpolymer of maleic acid, an acrylic acid alkyl ester, and vinyl acetate, Component (B): Homopolymer of carboxylic acid
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公开(公告)号：US20170275571A1
公开(公告)日：2017-09-28
申请号：US15509683
申请日：2015-10-01
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Takahiro KAWAKATSU , Kazuki ISHII
Abstract: 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. The urea derivative preferably includes urea (H2N—CO—NH2) and/or biuret (H2N—CO—NH—CO—NH2). The cleaning liquid is an aqueous solution produced by diluting the cleaning agent. The method for cleaning an RO membrane uses the cleaning liquid. Urea and biuret have a structure analogous to amide bonds included in aromatic polyamide RO membranes, and have a strong affinity for amide bond portions. Urea and biuret adsorb onto the amide bond portions, and prevent the amide bonds from being broken by the cleaning liquid.
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