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公开(公告)号：US20220111336A1
公开(公告)日：2022-04-14
申请号：US17417623
申请日：2019-12-12
Applicant: KUBOTA CORPORATION
Inventor： Shintaro NISHIMOTO , Keishi WATANABE , Tetsuya UENAKA , Fang ZHAO , Akira MATSUNAGA
Abstract: A membrane filtration device includes a plurality of membrane separation units vertically disposed in multiple stages. The membrane separation unit has a primary side communicating with a backwash drainage system and a flushing-air supply system to receive supplied raw water and a secondary side communicating with a backwash-water supply system to collect permeate. The backwash-water supply system includes a backwash-water main pipe and a plurality of backwash-water branch pipes to feed the backwash water into the membrane separation units. The backwash drainage system includes a plurality of backwash-drainage branch pipes and a backwash-drainage main pipe connected in parallel to the backwash-drainage branch pipes. The flushing-air supply system includes an air main pipe for passing flushing air upward and a plurality of air branch pipes for feeding flushing air into the membrane separation units, the air branch pipes being connected in parallel to the air main pipe.
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公开(公告)号：US20220023802A1
公开(公告)日：2022-01-27
申请号：US17296367
申请日：2019-12-03
Applicant: KUBOTA CORPORATION
Inventor： Keishi WATANABE , Shintaro NISHIMOTO , Tetsuya UENAKA , Fang ZHAO , Akira MATSUNAGA
Abstract: A membrane defect inspection method that can detect damage in a filtrate membrane and can detect presence or absence of damage or a seal defect in a membrane module; and the method is for a membrane module set including multiple membrane modules connected under gas detection piping communicating with primary spaces of the multiple membrane modules where raw water is supplied or secondary spaces in multiple membrane modules where treated water is extracted after the raw water is filtrated by membranes. The method includes a gas injection process where gas is injected into spaces opposite the primary or secondary spaces communicating with gas detection piping in the multiple membrane modules while the gas detection piping is filled with water, and a vibration detection process where a vibration sensor is brought into contact with a protrusion protruding outward from the gas detection piping to detect vibration of the gas detection piping.
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公开(公告)号：US20210394123A1
公开(公告)日：2021-12-23
申请号：US17296069
申请日：2019-12-03
Applicant: KUBOTA CORPORATION
Inventor： Keishi WATANABE , Shintaro NISHIMOTO , Tetsuya UENAKA , Fang ZHAO , Akira MATSUNAGA
Abstract: A membrane defect inspection method is for a membrane module set including a plurality of membrane modules connected in parallel under a straight pipe portion of gas detection piping extending in a horizontal direction and communicating with primary spaces in the plurality of membrane modules to which raw water is supplied or secondary spaces. The method includes a gas injection process where gas is injected into spaces opposite to the primary spaces or the secondary spaces communicating with the gas detection piping while the gas detection piping is filled with water, and an echo detection process where an ultrasonic sensor is brought into contact with an end portion of the straight pipe portion of the gas detection piping, and a reflected wave of an ultrasonic wave transmitted from the ultrasonic sensor is detected.
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