Patents Assigned to Metawater Co., Ltd.
  • Publication number: 20230173778
    Abstract: Capable of increasing both solid-liquid separation efficiency and cleanability. A separation device includes a casing including an object discharging port on a first direction E1 side than an object feeding port, and a separated liquid discharging port on a second direction E2 side than the object feeding port; a screw shaft; a first screw blade having a second surface that faces space Sla into which a pre-object is fed from the object feeding port in the casing; and a second screw blade having a first surface that faces the space Sla into which the pre-object is fed from the object feeding port in the casing. An end part of the first screw blade on the first direction E1 side is placed on the first direction E1 side than an end part of the second screw blade on the first direction E1 side.
    Type: Application
    Filed: March 15, 2021
    Publication date: June 8, 2023
    Applicant: Metawater Co., Ltd.
    Inventor: Masafumi TAN
  • Patent number: 11655175
    Abstract: A screw type separation device includes: a casing that has a separated liquid discharge port on one end part side and has an object discharge port on the other end part side, while the other end part side is positioned lower, in terms of vertical directions, than the one end part side; a screw shaft provided inside the casing; a first screw blade; and a second screw blade that forms a first space between one face and the first screw blade facing the one face and forms a second space between the other face and the first screw blade facing the other face.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: May 23, 2023
    Assignee: Metawater Co., Ltd.
    Inventors: Yoshiyuki Sugawara, Masafumi Tan
  • Publication number: 20230107168
    Abstract: Appropriately perform solid-liquid separation. A separation device (1) includes a casing (10), a screw shaft (12), a first screw blade (14), and a second screw blade (16). At least one of the first screw blade (14) and the second screw blade (16) has an opening that penetrates from one surface to another surface, designed based on the outflow of separated liquid (C) and solids from the screw blade.
    Type: Application
    Filed: March 15, 2021
    Publication date: April 6, 2023
    Applicant: Metawater Co., Ltd.
    Inventors: Yoshinori ANDO, Satoshi INOUE
  • Patent number: 11597667
    Abstract: A wastewater treatment system includes a plurality of reaction tanks, a blowing pipe, a blower unit, and an air supply amount controller. The air supply amount controller includes: a water quality measurement unit configured to measure a state of wastewater; a necessary air amount acquisition unit configured to acquire, a necessary air amount for achieving a predetermined target water quality of wastewater; a target in-pipe pressure calculation unit configured to calculate a blowing pipe loss pressure when the necessary amount of air is supplied into the blowing pipe, calculate a target in-pipe pressure based on the blowing pipe loss pressure, and change the calculated target in-pipe pressure in accordance with change of the necessary air amount; and a blowing control unit configured to control air supply from the blower unit so that the pressure in the blowing pipe becomes equal to the target in-pipe pressure.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: March 7, 2023
    Assignee: Metawater Co., Ltd.
    Inventors: Hiroyuki Takahashi, Daisuke Naka, Nobuki Tsuboi, Masashi Inoue
  • Patent number: 11331626
    Abstract: This membrane filtration method includes: a membrane filtration process for adding a coagulant to water to be treated which contains viruses, and filtering the water to be treated by using a filtration membrane; and a cleaning process for, after the membrane filtration process, cleaning the filtration membrane, the membrane filtration process and the cleaning process being repeatedly performed, wherein, in the membrane filtration process, in the initial period of filtration, at least either an operation of filtering the water to be treated that includes the coagulant added by an amount larger than the amount of a coagulant added in a normal case, or an operation of filtering the water to be treated that has a pH lower than the pH of water to be treated in a normal case, is performed.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: May 17, 2022
    Assignee: Metawater Co., Ltd.
    Inventors: Naruaki Kadokawa, Yasuhiro Kato, Tomomi Sao
  • Patent number: 10773981
    Abstract: A sewage treatment system, includes a solid-liquid separating apparatus having a first filtering medium packed layer packed with a predetermined filtering medium, configured to separate sewage to be treated into solid components and filtered water by passing the sewage through the first filtering medium packed layer upward, and configured to reversely wash the first filtering medium packed layer by passing the filtered water through the first filtering medium packed layer downward at a predetermining timing; and a trickling filter installed on a latter stage of the solid-liquid separating apparatus, having a second filtering medium packed layer packed with a filtering medium attached with microorganisms, and configured to allow the filtered water to fall into the second filtering medium packed layer by trickling the filtered water onto an upper part of the second filtering medium packed layer to flow out treated water acquired by biotreating the filtered water by the microorganisms.
    Type: Grant
    Filed: November 25, 2013
    Date of Patent: September 15, 2020
    Assignee: Metawater Co., Ltd.
    Inventors: Atsushi Miyata, Shigeki Takeda, Tetsutarou Kuruma
  • Patent number: 10358365
    Abstract: A distributor pipe includes: a main pipe including a cylindrical part; and a plurality of branch pipes communicating with the main pipe and arranged, on a cylindrical curved surface of the main pipe, side by side along a longitudinal direction of the main pipe. A pipe diameter ratio D1/D0 of a pipe diameter D1 of the branch pipe to a pipe diameter D0 of the main pipe is greater than 0.2 and less than 0.8, and the plurality of branch pipes are arranged according to: respective effluent flow ratios, at a time a liquid flows into the main pipe in a predetermined flow velocity range, determined in accordance with respective arrangement orders of the plurality of branch pipes along a direction in which the liquid flows and along the longitudinal direction of the main pipe; and respective areas of circular or hollow-circular sections allotted to the plurality of branch pipes.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: July 23, 2019
    Assignee: Metawater Co., Ltd.
    Inventors: Masao Tabata, Tomoki Kurinami
  • Patent number: 10351447
    Abstract: Provided is a water treatment system that prevents overlook and misdetection of abnormal flocculation. The water treatment system includes a mix tank, a flocculation tank, a plurality of floc-particle-diameter measurement devices, a fault detection device that detects abnormal flocculation, and a notification device that notifies occurrence of the abnormal flocculation. The fault detection device includes: a calculator that calculates at least one of a difference and a ratio between particle diameters of floc; a storage that stores therein a tolerable range of at least one of the difference and the ratio between the particle diameters of floc; a determiner that, when the calculated value is within the tolerable range, determines that it is normal, and when the calculated value is outside the tolerable range, determines that it is abnormal; and an outputter that transmits an abnormal flocculation detection signal to the notification device.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: July 16, 2019
    Assignee: Metawater Co., Ltd.
    Inventors: Yuka Yamaguchi, Yusuke Hisamoto, Hiroshi Munehira, Shigeyuki Okada, Dabide Yamaguchi
  • Patent number: 10322958
    Abstract: A sludge dewatering system includes: a concentration apparatus that concentrates sludge while conveying the sludge on a top surface of a filter body; and a dewatering apparatus that subjects the sludge discharged from the concentration apparatus to pressure dewatering. The concentration apparatus includes: a filtering unit that subjects the sludge, which has been added with a first chemical agent, to gravity filtration; a chemical feeder that adds a second chemical agent to the sludge conveyed in the filtering unit; and a moving mechanism that moves the sludge, which has been added with the second chemical agent, in a direction intersecting a conveyance direction of the filter body.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: June 18, 2019
    Assignee: Metawater Co., Ltd.
    Inventors: Yoshiyuki Sugawara, Tadashi Kunitani, Yoshitaka Hashimoto
  • Patent number: 10035720
    Abstract: A sludge condensing machine includes: a gravity filtration section conducting a gravity filtering to a sludge while conveying the sludge on an upper surface of a filtration body, and a movement mechanism, disposed at a downstream side of a sludge insertion position of the gravity filtration section, for reducing a dimension of the sludge in a width direction on the filtration body by moving the sludge in a direction intersecting a conveying direction that the sludge is conveyed by the filtration body.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: July 31, 2018
    Assignee: Metawater Co., Ltd.
    Inventor: Yoshiyuki Sugawara
  • Patent number: 10000403
    Abstract: An organic-waste-processing apparatus reducing a moisture of, and conducting a thermal operation process to, an organic waste, includes: a moisture-reducing unit; a combustion unit; a combustion-energy-supply unit; an energy-supply-operation controller; an organic-waste-energy-estimating unit; a total-energy-consumption measuring unit; a relation-maintaining unit; a quantitative-relationship-grasping unit; and a moisture reduction controller. The moisture reduction controller controls an operation of the moisture-reducing unit so that the estimated value of the organic waste energy to be estimated by the organic-waste-energy-estimating unit is directed in a direction reducing a quantitative difference from the optimum value of the organic waste energy based on the quantitative relationship grasped by the quantitative-relationship-grasping unit between the optimum value of the organic waste energy and the latest estimated value of the organic waste energy.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: June 19, 2018
    Assignee: Metawater Co., Ltd.
    Inventors: Takaaki Kanagawa, Yoshimasa Tomibe, Koki Sato, Kosuke Kamiya, Masuo Inoue
  • Patent number: 9868091
    Abstract: A transverse-mounted membrane filtration apparatus includes an air diffuser device including a shelf-shaped member and a gas-feeding unit, the shelf-shaped member including a plurality of shelf boards being arranged in a flow path segment at an immediate upstream of an end surface of a membrane element with a predetermined distance from the end surface of the membrane element and covering an entire flow path of the membrane element along a vertical direction, the gas-feeding unit feeding a gas to the raw water for washing the membrane element through a gas-feeding port provided at a bottom portion of a flow path of the shelf-shaped member. Herein a shelf board at a lowermost position of the shelf-shaped member is inclined toward a side of the end surface of the membrane element in a vertically upper direction.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: January 16, 2018
    Assignee: Metawater Co., Ltd.
    Inventors: Junpei Tsukamoto, Shinichi Sakata
  • Patent number: 9857304
    Abstract: A measuring method of bromate ion concentration includes a first fluorescence intensity measuring process including a process of passing hydrochloric acid through an anion exchanger to elute bromate ions adsorbed to the anion exchanger into the hydrochloric acid and a process of measuring the fluorescence intensity of the hydrochloric acid passed through the anion exchanger, a second fluorescence intensity measuring process including a process of passing a hydrochloric acid solution containing a fluorescent substance whose fluorescence intensity changes due to coexistence of bromate ions through an anion exchanger to elute bromate ions adsorbed to the anion exchanger into the hydrochloric acid solution and a process of measuring the fluorescence intensity of the hydrochloric acid solution passed through the anion exchanger, and a calculation process determining the bromate ion concentration in the water sample by using the difference between the fluorescence intensities of the hydrochloric acid solution and t
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: January 2, 2018
    Assignee: Metawater Co., Ltd.
    Inventors: Natsumi Konishi, Eri Hasegawa
  • Patent number: 9737896
    Abstract: A casing that squeezes sludge floc at one end portion, a screw shaft, a first screw blade spirally provided on an outer peripheral surface of the screw shaft, and a second screw blade provided side by side along a longitudinal direction of the screw shaft with the first screw blade with a predetermined interval from the first screw blade, are included. In the casing, a concentration zone and a separated liquid zone, which are substantially divided from each other by the first screw blade and the second screw blade, are formed. By rotation of the screw shaft, the sludge floc is squeezed in the concentration zone to be separated into sludge and separated liquid, and the separated liquid is moved rearward in the separated liquid zone to be discharged, while the sludge is discharged outside.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: August 22, 2017
    Assignee: Metawater Co., Ltd.
    Inventor: Yoshiyuki Sugawara
  • Publication number: 20170050400
    Abstract: A casing that squeezes sludge floc at one end portion, a screw shaft, a first screw blade spirally provided on an outer peripheral surface of the screw shaft, and a second screw blade provided side by side along a longitudinal direction of the screw shaft with the first screw blade with a predetermined interval from the first screw blade, are included. In the casing, a concentration zone and a separated liquid zone, which are substantially divided from each other by the first screw blade and the second screw blade, are formed. By rotation of the screw shaft, the sludge floc is squeezed in the concentration zone to be separated into sludge and separated liquid, and the separated liquid is moved rearward in the separated liquid zone to be discharged, while the sludge is discharged outside.
    Type: Application
    Filed: November 8, 2016
    Publication date: February 23, 2017
    Applicant: Metawater Co., Ltd.
    Inventor: Yoshiyuki SUGAWARA
  • Publication number: 20160368799
    Abstract: A distributor pipe includes: a main pipe including a cylindrical part; and a plurality of branch pipes communicating with the main pipe and arranged, on a cylindrical curved surface of the main pipe, side by side along a longitudinal direction of the main pipe. A pipe diameter ratio D1/D0 of a pipe diameter D1 of the branch pipe to a pipe diameter D0 of the main pipe is greater than 0.2 and less than 0.8, and the plurality of branch pipes are arranged according to: respective effluent flow ratios, at a time a liquid flows into the main pipe in a predetermined flow velocity range, determined in accordance with respective arrangement orders of the plurality of branch pipes along a direction in which the liquid flows and along the longitudinal direction of the main pipe; and respective areas of circular or hollow-circular sections allotted to the plurality of branch pipes.
    Type: Application
    Filed: September 6, 2016
    Publication date: December 22, 2016
    Applicant: Metawater Co., Ltd.
    Inventors: Masao TABATA, Tomoki KURINAMI
  • Publication number: 20150315039
    Abstract: Disclosed herein is a method capable of economically treating water containing water-insoluble substance. The method for treating water containing water-insoluble substance, typified by produced water, using a porous material having functional groups on its surface and preferably made of an inorganic oxide includes: a first step of bringing an aqueous solution containing ions ion-exchangeable for the functional groups into contact with the surface to attach the ions to the surface; and a second step of allowing the water containing water-insoluble substance to pass through the porous material from the surface having the ions attached thereto to remove the water-insoluble substance from the water containing water-insoluble substance. The method may further include, after the first step but before the second step, the step of firing the porous material under a temperature condition of 300° C. to 500° C. for 1 to 5 hours.
    Type: Application
    Filed: December 4, 2013
    Publication date: November 5, 2015
    Applicant: Metawater Co., Ltd.
    Inventors: Kanako Tsuda, Masayo Shinohara, Mitsunori Shimura, Teruyasu Hirayama, Norimasa Nonaka, Fuyuhiko Ishikawa, Satoru Mima
  • Patent number: 9028695
    Abstract: The process includes operation as follows: putting ozone generated by an ozone generator into raw water, in a normal mode, to subject the raw water to ozone treatment; injecting a flocculant into the raw water before or after the ozone treatment; filtering the raw water by a separation membrane after the ozone treatment and the injection of the flocculant; and intermittently setting cleaning mode to put a larger quantity of cleaning ozone than that in the normal mode into the raw water so as to intermittently increase the concentration of dissolved ozone, thereby cleaning the filtration membrane.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: May 12, 2015
    Assignee: Metawater Co., Ltd.
    Inventors: Motoharu Noguchi, Hideki Kozono, Michiko Aoki
  • Patent number: 9023654
    Abstract: A method for measuring bromate ions includes: an adding step of adding a fluorescent substance whose fluorescence intensity changes by the coexistence of bromate ions to sample water; a measuring step of measuring the fluorescence intensity of the fluorescent substance; a difference calculating step of calculating a difference between the fluorescence intensity measured and a reference fluorescence intensity of reference sample water that contains no bromate ion; and a concentration calculating step of calculating bromate ion concentration from the calculated fluorescence intensity difference. The measuring step includes a step of measuring the fluorescence intensity at any one of a case where an excitation wavelength is 264 nm and an emission wavelength is 400 nm, a case where the excitation wavelength is 264 nm and the emission wavelength is 480 nm, and a case where the excitation wavelength is 300 nm and the emission wavelength is 400 nm.
    Type: Grant
    Filed: January 2, 2014
    Date of Patent: May 5, 2015
    Assignee: Metawater Co., Ltd.
    Inventors: Natsumi Konishi, Eri Hasegawa, Yoshiharu Tanaka, Shukuro Igarashi, Takao Ohtomo
  • Patent number: 8968569
    Abstract: A method of wastewater reutilization by which reusable water can be stably obtained from a wastewater. Ozone is added to a wastewater, such as water resulting from sewage treatment, in such a small amount as to result in a residual ozone concentration as measured before membrane filtration of 0.01-1.0 mg/L. Ozone is thus brought into contact with fine solids contained in the wastewater to alter the surface properties of the fine solids so that the solids are easily to coagulate. Thereafter, a coagulant, e.g., PACl, is added from a coagulant addition device (3). The fine solids are coagulated in a coagulation tank (5) or a line mixer and the resultant water is subjected to membrane filtration with an ozone-resistant separation membrane (6) such as ceramic membrane. Thus, reusable water is obtained which has a residual ozone concentration, as measured after filtration through the membrane, less than 0.5 mg/L.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: March 3, 2015
    Assignee: Metawater Co., Ltd.
    Inventors: Shigehiro Suzuki, Motoharu Noguchi, Hideki Kozono