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公开(公告)号：US20240025772A1
公开(公告)日：2024-01-25
申请号：US18266259
申请日：2021-12-24
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yuta OHTSUKA , Kunihiro HAYAKAWA , Gou NAKAGAWA
CPC classification number: C02F1/441 , C02F1/76 , B01D65/08 , C02F2303/20 , B01D2321/168
Abstract: The purpose of the present invention is to provide a technique whereby it becomes possible to operate for a longer period of time in an aqueous system equipped with a membrane separation apparatus. The present invention can provide a membrane separation method, the method comprising containing a combined-chlorine-based oxidizing agent to water of interest, and allowing the water of interest which contains the combined-chlorine-based oxidizing agent to pass through a membrane separation apparatus, in which the water of interest which contains the combined-chlorine-based oxidizing agent has a Free 300-second value of 0.036 mg/L-Cl2 or more wherein the Free 300-second value is a result of the measurement of a chlorine concentration after 300 seconds using a free chlorine measurement reagent.
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公开(公告)号：US20180194659A1
公开(公告)日：2018-07-12
申请号：US15741920
申请日：2016-06-29
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kunihiro HAYAKAWA , Kazuhisa FUJITA
IPC: C02F9/00
CPC classification number: C02F9/00 , B01D61/02 , B01D61/14 , B01D61/58 , B01D2311/04 , B01D2311/12 , B01D2311/18 , C02F1/004 , C02F1/441 , C02F1/444 , C02F1/66 , C02F5/10 , C02F5/105 , C02F2103/023 , C02F2103/16 , C02F2103/28 , C02F2303/08 , C02F2303/22 , F28B9/04 , F28F19/00 , F28F25/02 , F28G13/00
Abstract: 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. The dispersant includes a polymer having a carboxyl group and having a weight average molecular weight of 5,000 or less, and permeates through the clarification equipment. The polymer having a carboxyl group and having a weight average molecular weight of 5,000 or less permeates through the clarification equipment, and performs as a scale dispersing agent for the RO membrane, preventing precipitation of scale. Since the polymer intrinsically has an anticorrosion effect, it becomes unnecessary to add a phosphoric acid compound to the cooling water system as an anticorrosion agent, or the required amount of the compound to be added can be reduced.
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3.发明申请公开(公告)号：US20150306545A1
公开(公告)日：2015-10-29
申请号：US14649790
申请日：2013-12-18
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kunihiro HAYAKAWA , Takahiro KAWAKATSU
CPC classification number: B01D67/0088 , B01D61/025 , C02F1/441 , C02F2101/30 , C02F2103/04 , C02F2103/08 , C02F2103/346 , C02F2209/001 , C02F2209/20 , C08K5/1345 , C08K5/20 , C08K5/31 , C09D129/04
Abstract: To provide a method for improving a rejection rate of an RO membrane, which further improves the stability of removal performance (rejection rate) and flux stability (sustainability of contamination resistance). In a method for improving a rejection rate of an RO membrane, including a step of allowing an aqueous solution containing a polyphenol to pass through an RO membrane, the method further includes a step of allowing an aqueous solution containing at least one type selected from the group consisting of a modified poly(vinyl alcohol), a high molecular polysaccharide, and a poly(amino acid) to pass through the RO membrane. The method preferably further includes a step of allowing an aqueous solution containing an organic compound having an amino group and having a molecular weight of 1,000 or less to pass through the RO membrane.
Abstract translation: 提供一种提高RO膜排斥率的方法，进一步提高了去除性能（排除率）和通量稳定性（耐污染性的可持续性）的稳定性。 在提高RO膜的排斥率的方法中，包括使含有多酚的水溶液通过RO膜的步骤，还包括使含有选自以下的至少一种的水溶液的工序： 由改性聚（乙烯醇），高分子多糖和聚（氨基酸）组成的组通过RO膜。 该方法优选进一步包括允许含有具有氨基并且分子量为1,000以下的有机化合物的水溶液通过RO膜的步骤。
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公开(公告)号：US20220097007A1
公开(公告)日：2022-03-31
申请号：US17421734
申请日：2020-01-27
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yuta OHTSUKA , Kunihiro HAYAKAWA
Abstract: Multiple chemical dosing levels of differing chemical dosages are set. When control is initiated, chemical dosing is started at the level with the highest chemical dosage. Each time a sampling period S passes, the rate of increase in the pressure difference of an RO system is compared with a threshold value A. When the rate of increase is at or below the threshold value A, the chemical dosage is reduced to the level that is one step lower. When the rate of increase is greater than the threshold value A, the chemical dosage is increased to the level that is one step higher.
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公开(公告)号：US20170232389A1
公开(公告)日：2017-08-17
申请号：US15504350
申请日：2014-08-19
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kunihiro HAYAKAWA , Takahiro KAWAKATSU
CPC classification number: B01D61/12 , B01D61/025 , B01D61/04 , B01D61/08 , B01D63/10 , B01D63/103 , B01D2311/04 , B01D2311/16 , B01D2311/2688 , B01D2313/143 , B01D2313/146 , B01D2325/04 , C02F1/001 , C02F1/24 , C02F1/441 , C02F1/52 , C02F3/1268 , C02F3/1273 , C02F9/00 , C02F2101/30 , Y02W10/15
Abstract: 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. The reverse-osmosis-membrane device includes a reverse-osmosis-membrane element including a membrane unit, the membrane unit including a reverse osmosis membrane having a thickness of 0.1 mm or less, a feed spacer disposed on a surface of the reverse osmosis membrane, and a permeate spacer disposed on the other surface of the reverse osmosis membrane. The reverse-osmosis-membrane device is operated at a permeation flux of 0.6 m/d or less.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20150376034A1
公开(公告)日：2015-12-31
申请号：US14766334
申请日：2014-02-14
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kunihiro HAYAKAWA , Takahiro KAWAKATSU
CPC classification number: C02F1/441 , B01D61/022 , B01D63/10 , B01D63/103 , B01D2313/143 , B01D2317/02 , B01D2317/025 , C02F2103/04 , C02F2103/08 , C02F2301/08 , Y02A20/131
Abstract: A quality of treated water is improved without loss of stability in multi-stage reverse osmosis membrane treatment. Raw water in a raw water tank 1 is fed to a first-stage reverse osmosis membrane unit 3 by compression with a first pump 2, and concentrated water is discharged while permeated water is introduced into an intermediate tank 5 through a piping 4. The water in the intermediate tank 5 is fed to a second-stage reverse osmosis membrane unit 7 by compression with a second pump 6, and permeated water is taken out through a piping 8 while concentrated water is returned to the raw water tank 1 through a piping 9. The thickness of the raw water spacer of the reverse osmosis membrane units is more than 0.6 mm for the first stage and is 0.6 mm or less for the second stage.
Abstract translation: 改善处理水的质量，而不会在多级反渗透膜处理中失去稳定性。 原水槽1中的原水通过第一泵2的压缩被供给到第一级反渗透膜单元3，并且当渗透的水通过管道4被引入中间罐5时，浓缩的水被排出。水 在中间罐5中，通过第二泵6的压缩将第二级反渗透膜单元7供给到第二级反渗透膜单元7，通过配管8将浓缩的水通过配管9返回到原水槽1 反渗透膜单元的原水间隔物的厚度对于第一阶段大于0.6mm，第二阶段的厚度为0.6mm以下。
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7.发明申请公开(公告)号：US20250099916A1
公开(公告)日：2025-03-27
申请号：US18715096
申请日：2022-12-08
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yuta OHTSUKA , Junichi TAKAHASHI , Kunihiro HAYAKAWA
Abstract: A silica fouling inhibition method for a reverse osmosis membrane system is provided, in which an acrylic acid-based polymer and/or a maleic acid-based polymer; and a combined chlorine-based oxidizing agent and/or a combined bromine-based oxidizing agent are allowed to be present in water to be treated. A silica fouling inhibitor for a reverse osmosis membrane system is provided, the silica fouling inhibitor includes: a copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid and/or a terpolymer of acrylic acid, acrylamide methylpropanesulfonic acid, and N-substituted acrylamide; and a combined chlorine-based oxidizing agent and/or a combined bromine-based oxidizing agent.
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公开(公告)号：US20250051203A1
公开(公告)日：2025-02-13
申请号：US18721662
申请日：2022-12-15
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yuta OHTSUKA , Chikako SHIMPO , Gou NAKAGAWA , Junichi TAKAHASHI , Kunihiro HAYAKAWA
Abstract: A method for preventing microorganism fouling in a water system containing a reducing agent, said microorganism fouling prevention method for a water system being characterized by adding a stabilized chlorine-based oxidizing agent composed of a chlorine-based oxidizing agent and a sulfamic acid compound, with the ratio of the sulfamic acid compound relative to 1 mol effective chlorine of the chlorine-based oxidizing agent being 1-1.5 mol, and/or a stabilized bromine-based oxidizing agent composed of a bromine-based oxidizing agent and a sulfamic acid compound, with the ratio of the sulfamic acid compound relative to 1 mol effective chlorine conversion amount of the bromine-based oxidizing agent being 1-1.5 mol, to the water system, such that the addition concentration of the stabilized chlorine-based oxidizing agent and/or the stabilized bromine-based oxidizing agent relative to the reducing agent concentration in the water system is 2.5 times or more by molar ratio.
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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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10.发明申请METHOD FOR OPERATING REVERSE OSMOSIS MEMBRANE DEVICE, AND REVERSE OSMOSIS MEMBRANE DEVICE 审中-公开操作反渗透膜装置的方法以及反转的OSMOSIS膜装置公开(公告)号：US20160016122A1
公开(公告)日：2016-01-21
申请号：US14766355
申请日：2014-02-14
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kunihiro HAYAKAWA , Takahiro KAWAKATSU
CPC classification number: B01D63/10 , B01D61/025 , C02F1/441 , C02F3/1268 , C02F3/1273 , C02F2103/04 , C02F2103/08 , C02F2303/20 , C02F2303/22 , Y02A20/131 , Y02W10/15
Abstract: Provide is a reverse osmosis membrane device that is capable of treating raw water containing membrane-fouling substance in large quantities, such as MBR-treated water, in a stable manner while preventing decreases in permeate flow rate, and a method for operating thereof. A method for operating a reverse osmosis membrane device that treats raw water containing high-molecular-weight organic matter, wherein the raw water contains high-molecular-weight organic matter having a molecular weight of 10,000 or more at a concentration of 0.01 ppm or more, wherein the reverse osmosis membrane device is equipped with a spiral-type reverse osmosis membrane element that has a membrane surface area satisfying the below formula (1), and wherein the reverse osmosis membrane device is operated at a permeate flux of 0.6 m/d or less: membrane surface area (m2)≧n2×(11/16) (1) wherein n represents a diameter (inches) of the reverse osmosis membrane element.
Abstract translation: 提供一种反渗透膜装置及其操作方法，其能够以稳定的方式稳定地处理大量含有膜污染物质的含水膜污染物质，如防止渗透物流速降低的反渗透膜装置。 一种处理含有高分子量有机物的原水的反渗透膜装置的方法，其中，所述原水含有浓度为0.01ppm以上的分子量为10,000以上的高分子量有机物质 其特征在于，所述反渗透膜装置配备有具有满足下述式（1）的膜表面积的螺旋型反渗透膜元件，其中所述反渗透膜装置以0.6m / d的渗透流动作用 以下：膜表面积（m2）≥n2×（11/16）（1）其中n表示反渗透膜元件的直径（英寸）。
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