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公开(公告)号：US20250162908A1
公开(公告)日：2025-05-22
申请号：US18838220
申请日：2023-03-07
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Teruhisa KATO , Koya ABE
Abstract: Provided is a method for operating electric deionizer, in which concentration chambers and desalination chambers are defined between an anode and a cathode by an ion exchange membrane, concentrated water flows through the concentration chambers, raw water flows through the desalination chambers as water to be treated, and the treated water is extracted as product water, the method being characterized in that the water flows through all of the concentration chambers in the opposite direction of the water-passing direction of the water to be treated in the desalination chambers.
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公开(公告)号：US11926968B2
公开(公告)日：2024-03-12
申请号：US17252732
申请日：2019-04-11
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Takashi Saigusa
IPC: D21H21/04 , B01D21/01 , C02F1/50 , C02F1/56 , D21H17/28 , D21H17/53 , D21H23/04 , C02F101/34 , C02F103/28
CPC classification number: D21H21/04 , B01D21/01 , C02F1/50 , C02F1/56 , D21H17/28 , D21H17/53 , D21H23/04 , C02F2101/34 , C02F2103/28 , C02F2303/04
Abstract: Provided is a method for producing paper that enables to fix an increased amount of starch components contained in papermaking process water to a papermaking raw material (suspended solid: SS) contained in the papermaking process water, and enables (1) enhancement of the strength of paper, (2) reduction in the contamination of the papermaking process water by microorganisms, etc., (3) suppression of the foaming of the papermaking process water, (4) decrease in the load of the waste water treatment, etc. The method comprises a step of adding a polymer having a polyalkylene oxide moiety to papermaking process water containing SS containing a papermaking raw material and unfixed starch. At this time, the concentration of SS contained in the papermaking process water is 100 mg/L or more, the concentration of the unfixed starch is 10 mg/L or more, and the salt viscosity of the polymer is 3 mPa·s or more.
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公开(公告)号：US11474036B2
公开(公告)日：2022-10-18
申请号：US17053356
申请日：2019-08-09
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Nobuaki Nagao
Abstract: Provided is a flocculation state monitoring sensor with which blockage of an ejecting part which ejects a gas towards a light emitting part and a light receiving part can be prevented, and which performs stable monitoring. A flocculation state monitoring sensor comprising: a light emitting part which irradiates laser light towards a measuring region which measures a flocculation state; and a light receiving part which receives light scattered along a direction which intersects with a direction along an optical axis of said light emitting part, wherein the light emitting part and the light receiving part are cleaned by air being ejected from nozzles theretowards. A small amount of air is provided to the nozzles between cleaning periods to purge floc, etc.
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公开(公告)号：US20220276215A1
公开(公告)日：2022-09-01
申请号：US17637452
申请日：2020-09-02
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Nobuaki NAGAO
Abstract: A water sampling device for water quality measurement is capable of changing the sampling amount, the number of sampling container(s), the sampling container type and so on according to the item of water quality measurement. Water in a water system can be sampled into a first container Y1 via a sampling source pipe 1, a manifold 2, and a first sampling pipe 3 and a pump P1 connected to the manifold 2. Water in the water system also can be sampled into a second container Y2 from the manifold 2 via a second sampling pipe 4 and a pump P2. In a case where the detection value(s) of one or more of the sensors S1 to S3 set in the water system exceeds a preset standard value or deviates from a standard range, water to be tested is sampled from the water system.
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公开(公告)号：US20220144668A1
公开(公告)日：2022-05-12
申请号：US17601930
申请日：2020-03-13
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Naoya KAWARABAYASHI
IPC: C02F1/24
Abstract: The water treatment device includes: a coagulation reaction tank into which the water to be treated is introduced; a coagulant supply unit that supplies the coagulant; a floatation separation tank that makes the agglomerates float on the upper layer of the treated water to perform solid-liquid separation; and a coagulant addition amount adjustment device which adjusts the addition amount of the coagulant from the coagulant supply unit and adds the coagulant to the coagulation reaction tank. The coagulant addition amount adjustment device includes: a detection part for detecting the turbidity of the treated water inside the floatation separation tank; and an adjustment part for adjusting, on the basis of the detection value of the detection part, the amount of the coagulant added to the water to be treated. A detection unit of the detection part is installed inside the floatation separation tank.
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Patent Agency Ranking
公开(公告)号：US11186951B2
公开(公告)日：2021-11-30
申请号：US16641005
申请日：2018-11-21
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Shintaro Mori , Hideki Nishida , Shogo Ujiie , Qian Lin
IPC: D21F5/18
Abstract: When the efficiency of heating with steam is enhanced by adding a condensed water film formation-suppressing amine in a heating step of heating a material to be heated with the steam via a metallic material, the amount of the condensed water film formation-suppressing amine to be added is controlled based on any of the concentration of the condensed water film formation-suppressing amine in a drain, the pH of the drain, the electroconductivity of the drain, the amount of the drain, the amount of the steam, the temperature of the drain, the temperature of the metallic material, and the amount of the metallic material eluted in the drain.
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公开(公告)号：US11130694B2
公开(公告)日：2021-09-28
申请号：US15741920
申请日：2016-06-29
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Kunihiro Hayakawa , Kazuhisa Fujita
IPC: C02F5/10 , C02F1/00 , C02F9/00 , C02F1/44 , B01D61/58 , F28F19/00 , F28B9/04 , F28F25/02 , F28G13/00 , B01D61/14 , B01D61/02 , C02F103/16 , C02F103/18 , C02F1/66 , C02F103/02 , C02F103/28
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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公开(公告)号：US11104594B2
公开(公告)日：2021-08-31
申请号：US16484475
申请日：2017-03-09
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yuuichi Ogawa
Abstract: An ammonia solution production device produces a dilute ammonia solution by supplying ammonia from an ammonia supply device to ultrapure water supplied from an ultrapure water production device and dissolving the ammonia, and supplies the ammonia solution to a use point. Here, the ultrapure water production device has the ability to supply ultrapure water having a resistance value of 18 MΩ·cm or more, and a metal ion concentration of 1 ng/L or less, particularly 0.1 ng/L or less. Ammonia is added to the ultrapure water from the ammonia supply device to produce the dilute ammonia water. The ammonia solution production device is suitable for the production of dilute ammonia water having an ammonia concentration of 100 mg/L or less. Such an ammonia solution production device is capable of producing an ammonia solution with a stable concentration, and achieves excellent follow-up performance with respect to a change in the concentration.
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公开(公告)号：US20210262933A1
公开(公告)日：2021-08-26
申请号：US17053356
申请日：2019-08-09
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Nobuaki NAGAO
Abstract: Provided is a flocculation state monitoring sensor with which blockage of an ejecting part which ejects a gas towards a light emitting part and a light receiving part can be prevented, and which performs stable monitoring. A flocculation state monitoring sensor comprising: a light emitting part which irradiates laser light towards a measuring region which measures a flocculation state; and a light receiving part which receives light scattered along a direction which intersects with a direction along an optical axis of said light emitting part, wherein the light emitting part and the light receiving part are cleaned by air being ejected from nozzles theretowards. A small amount of air is provided to the nozzles between cleaning periods to purge floc, etc.
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公开(公告)号：US11034602B2
公开(公告)日：2021-06-15
申请号：US16464541
申请日：2017-09-13
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Hideki Kobayashi , Tetsurou Fukase
Abstract: Oxygen permeable membrane modules are provided in a reactor in multiple stages. An oxygen-containing gas from a blower B is sequentially circulated through the oxygen permeable membrane modules via pipes and is discharged from a pipe. Raw water flows out into a bottom part of the reactor through a plurality of nozzles, and a fluidized bed F of a biological carrier such as activated carbon is formed inside the reactor. Treated water flows out of a trough via an outflow port.
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