公开(公告)号：US10889514B2

公开(公告)日：2021-01-12

申请号：US15391273

申请日：2016-12-27

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yasuhiro Hashimoto ,  Daisuke Ino ,  Tomoyasu Takaoka

IPC: C02F1/32 ,  C02F1/74 ,  C02F1/72

Abstract: A water treatment method includes: calculating a total amount of ions contained in a total amount of an aqueous solution introduced into a first tank; when the calculated total amount of ions is greater than a first threshold value, introducing part of slurry in the first tank into a second tank; introducing, with an introducing unit, one of a marker molecule and a stain into the second tank; irradiating, from a second light source, the second tank with visible light; detecting, with a detector, first intensity of the visible light having transmitted through the second tank; and outputting, when the activity of photocatalytic particles calculated based on the first intensity is equal to or smaller than a second threshold value, information prompting replacement of the photocatalytic particles, an instruction of recovering the activity of the photocatalytic particles, or information indicative of deterioration of the photocatalytic particles.

公开(公告)号：US10894733B2

公开(公告)日：2021-01-19

申请号：US15694906

申请日：2017-09-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hirofumi Fujita ,  Daisuke Ino ,  Yasuhiro Hashimoto ,  Yuko Maruo ,  Tomoyasu Takaoka ,  Masahiro Iseki

IPC: C02F9/00 ,  C02F1/32 ,  C02F1/44 ,  C02F1/72 ,  C02F101/30 ,  C02F101/20

Abstract: A method for controlling a liquid treatment apparatus of the present disclosure includes: (i) providing the liquid treatment apparatus; (ii) treating a polluted liquid in a photocatalytic reaction tank by a photocatalytic reaction to produce a treated liquid; (iii) introducing a liquid mixture into a separation tank from the photocatalytic reaction tank through a feed passage by a circulation pump; (iv) introducing a filtrate to an outside of the separation tank through an extraction passage while filtering the liquid mixture introduced into the separation tank by a filtration membrane, and feeding the liquid mixture to the photocatalytic reaction tank through an overflow passage; and (v) making a flow rate of the liquid mixture measured by a liquid mixture flow meter higher than a flow rate of the filtrate measured by a filtrate flow meter by controlling the circulation pump by a controller.

公开(公告)号：US10280093B2

公开(公告)日：2019-05-07

申请号：US15258693

申请日：2016-09-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tomoyasu Takaoka ,  Yasuhiro Hashimoto ,  Daisuke Ino

IPC: C02F1/44 ,  C02F1/32 ,  C02F1/72 ,  B01D61/00 ,  B01D63/02 ,  C02F1/00

Abstract: A water treatment method includes: introducing an aqueous solution containing impurities into a first tank; irradiating, from a light source, photocatalytic particles with ultraviolet light, to turn the aqueous solution introduced into the first tank into primary post-treatment water with which the impurities have been treated; reducing pressure in a first chamber by a filtering pump to filter the primary post-treatment water with a filtering membrane, the filtering separating the primary post-treatment water into the photocatalytic particles stopped at the filtering membrane and secondary post-treatment water that passes through the filtering membrane and does not contain the photocatalytic particles; measuring concentration of photocatalytic particles in the first tank; measuring the difference in pressure between the first chamber and the second chamber; and when the concentration of the photocatalytic particles is equal to or smaller than the first threshold value and the difference in pressure between the first chamber and the second chamber is greater than the second threshold value, supplying air to the filtering membrane by operating a compressor.