公开(公告)号：US11174181B2

公开(公告)日：2021-11-16

申请号：US16090643

申请日：2017-04-05

Applicant: METAWATER Co., Ltd.

Inventor： Yasuhiro Kato ,  Kensuke Okuda ,  Michiko Aoki ,  Naoki Kanekawa

IPC: C02F1/72 ,  C02F1/78 ,  C02F1/00

Abstract: An accelerated oxidation treatment method of performing oxidation treatment upon treatment water by supplying ozone and hydrogen peroxide to the treatment water, including an accelerated oxidation treatment process of bringing hydrogen peroxide and ozone into contact with the treatment water, and a bromate ion concentration measurement process of measuring the bromate ion concentration in the treatment water after the accelerated oxidation treatment process, with the amount of hydrogen peroxide supplied in the accelerated oxidation treatment process being adjusted on the basis of the measured value of bromate ion concentration.

公开(公告)号：US20200001237A1

公开(公告)日：2020-01-02

申请号：US16568765

申请日：2019-09-12

Applicant: METAWATER CO., LTD.

Inventor： Naruaki KADOKAWA ,  Yasuhiro Kato ,  Tomomi Sao

IPC: B01D61/14 ,  C02F1/52 ,  B01D65/02

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.

公开(公告)号：US11331626B2

公开(公告)日：2022-05-17

申请号：US16568765

申请日：2019-09-12

Applicant: METAWATER CO., LTD.

Inventor： Naruaki Kadokawa ,  Yasuhiro Kato ,  Tomomi Sao

IPC: B01D61/14 ,  B01D65/02 ,  C02F1/52 ,  C02F103/00

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.