Title:
UREA TREATMENT METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/107451
Kind Code:
A1
Abstract:
The present invention provides a urea treatment method and device that enable optimization of the added amount of a chlorine-based oxidizer such as NaClO required for breaking down urea. Provided is a urea treatment method in which hypobromite ions are generated by adding a chlorine-based oxidizer and a bromide salt to to-be-treated water containing urea so as to break down the urea in the to-be-treated water and obtain treated water, the method comprising: a) a step for determining the free residual bromine concentration and the free residual chlorine concentration in the treated water; and b) a step for controlling the added amount of the chlorine-based oxidizer and the bromide salt on the basis of the free residual bromine concentration and the free residual chlorine concentration. The device 1 comprises a bromide salt adding means 11, a chlorine-based oxidizer adding means 12, a urea decomposition tank 2, a residual chlorine meter 3, and a control device 4 for controlling the added amount of the chlorine-based oxidizer by the chlorine-based oxidizer adding means on the basis of the method.
Inventors:
MOMOTANI NAONORI (JP)
TAKAHASHI KAZUSHIGE (JP)
HASEBE YOSHIAKI (JP)
TAKAHASHI KAZUSHIGE (JP)
HASEBE YOSHIAKI (JP)
Application Number:
PCT/JP2021/035323
Publication Date:
May 27, 2022
Filing Date:
September 27, 2021
Export Citation:
Assignee:
ORGANO CORP (JP)
International Classes:
C02F1/76
Foreign References:
| JP2019063768A | 2019-04-25 | |||
| JP2019100781A | 2019-06-24 | |||
| JPH0994585A | 1997-04-08 | |||
| US20110318237A1 | 2011-12-29 |
Attorney, Agent or Firm:
MIYAZAKI Teruo et al. (JP)
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