公开(公告)号：US10597308B2

公开(公告)日：2020-03-24

申请号：US15039205

申请日：2013-11-25

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Takayuki Ohtsuki ,  Yuuya Sasaki ,  Hiroshi Iizuka ,  Yoshimasa Nakano

IPC: C02F1/44 ,  B01D61/12 ,  B01D61/02 ,  B01D61/04 ,  G05B13/02 ,  C02F1/00

Abstract: A water treatment plant controlling method including: determining whether or not there is a correlation, in water to be treated, between a water quality index and a concentration of a pollution component having no causal relationship with the water quality index, from a result of sample analysis of the water to be treated performed periodically; and (a) under a condition that there is a correlation, statistically analyzing a distribution of measurement values of the water quality index in a previous certain period of the water to be treated, and based on a result of the statistical analysis and the correlation, estimating the concentration of the pollution component of the water to be treated; and determining an operating condition of a water treatment plant for treating the water to be treated, based on the estimated concentration of the pollution component of the water to be treated; or (b) on a condition that a correlation is absent, statistically analyzing a distribution of concentration of the pollution component in all past sample analyses of the water to be treated, and based on a result of the statistical analysis, estimating the concentration of the pollution component of the water to be treated.

公开(公告)号：US11667515B2

公开(公告)日：2023-06-06

申请号：US16618813

申请日：2017-08-17

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Yuuya Sasaki

IPC: B67D7/74 ,  B01J4/00 ,  B67D7/36 ,  B67D7/70 ,  C11D7/04 ,  C11D7/50 ,  B67D7/02 ,  B01J4/02 ,  H01L21/02

CPC classification number: B67D7/743 ,  B01J4/00 ,  B01J4/001 ,  B67D7/0227 ,  B67D7/36 ,  B67D7/70 ,  C11D7/04 ,  C11D7/50 ,  B01J4/008 ,  B01J4/02 ,  H01L21/02041

Abstract: A chemical solution supply part for supplementing the chemical solution to the chemical solution storage tank and a purge gas supply part for supplying N2 gas as a purge gas to the chemical solution storage tank are in communication with the chemical solution storage tank, and a first manometer serving as a pressure measurement part is arranged on the chemical solution storage tank. In addition, a drain piping is connected to a head portion of the plunger pump, and an automatically controlled air-bleed valve, which is an air-bleed mechanism, is arranged on the drain piping. On the other hand, a second manometer is arranged in the middle of the chemical solution supply pipe, and a front end of the solution supply pipe on the downstream side serves as an injection point for the chemical solution S.