US 12,391,593 B2
Water treatment method and water treatment apparatus
Keijirou Tada, Tokyo (JP); and Muneaki Matsuda, Tokyo (JP)
Assigned to KURITA WATER INDUSTRIES LTD., Tokyo (JP)
Appl. No. 17/928,929
Filed by KURITA WATER INDUSTRIES LTD., Tokyo (JP)
PCT Filed May 18, 2021, PCT No. PCT/JP2021/018796
§ 371(c)(1), (2) Date Dec. 1, 2022,
PCT Pub. No. WO2021/246161, PCT Pub. Date Dec. 9, 2021.
Claims priority of application No. 2020-095303 (JP), filed on Jun. 1, 2020.
Prior Publication US 2023/0227342 A1, Jul. 20, 2023
Int. Cl. B01D 61/02 (2006.01); B01D 61/14 (2006.01); B01D 61/58 (2006.01); B01D 65/02 (2006.01); C02F 1/00 (2023.01); C02F 1/44 (2023.01); C02F 1/52 (2023.01); C02F 1/56 (2023.01); C02F 1/66 (2023.01); C02F 1/76 (2023.01); C02F 9/00 (2023.01)
CPC C02F 9/00 (2013.01) [B01D 61/58 (2013.01); B01D 65/02 (2013.01); C02F 1/008 (2013.01); C02F 1/5209 (2013.01); B01D 61/025 (2013.01); B01D 61/145 (2013.01); B01D 2313/70 (2022.08); B01D 2321/16 (2013.01); C02F 1/441 (2013.01); C02F 1/444 (2013.01); C02F 1/56 (2013.01); C02F 1/66 (2013.01); C02F 1/76 (2013.01); C02F 2209/06 (2013.01); C02F 2303/16 (2013.01); C02F 2303/20 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A water treatment method using a water treatment apparatus which includes a flocculation part into which water to be treated is introduced and three flocculant adding devices configured to add different flocculants to the flocculation part, wherein one of the three flocculant adding devices is a non-auxiliary device that is controlled to be in continuous operation for adding the flocculants, and remaining two of the three flocculant adding devices are auxiliary flocculant adding devices that are controlled to be in operation in response to detection of a water quality fluctuation,
wherein when a quality of the water to be treated has fluctuated, adding a new flocculant corresponding to the quality of the water to be treated to the flocculation part from the auxiliary flocculant adding devices, stopping addition of a flocculant, changing an added amount of a flocculant, or changing a kind of a flocculant is started.