MEMBRANE CLEANING DEVICE AND MEMBRANE CLEANING METHOD

Title:

MEMBRANE CLEANING DEVICE AND MEMBRANE CLEANING METHOD

Document Type and Number:

WIPO Patent Application WO/2019/229866

Kind Code:

A1

Abstract:

This membrane cleaning device generates ozone water as a result of carrying out, using treated water that has been filtration-treated by a membrane bioreactor (MBR) separation membrane (2) as dissolution water, the following steps: a first step for dissolving ozone gas in the dissolution water under neutral or alkaline conditions; and a second step for dissolving ozone gas in the dissolution water under acidic conditions. At such time, a transition from the first step to the second step is assessed on the basis of the organic matter concentration of the dissolution water, and the start of ozone water pumping to the separation membrane (2) is assessed on the basis of the dissolved ozone concentration of the dissolution water. This makes it possible to optimize the treatment times of the first step and the second step even if MBR operating conditions cause fluctuations in the organic matter concentration of the dissolution water. Due to this configuration, ozone water can be generated efficiently, and the costs of generating ozone water can be reduced.

Inventors:

HAYASHI YOSHIFUMI (JP)
IMAMURA EIJI (JP)
NODA SEIJI (JP)

Application Number:

PCT/JP2018/020677

Publication Date:

December 05, 2019

Filing Date:

May 30, 2018

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)

International Classes:

B01D65/06; C02F1/44; C02F1/78; C02F3/12

Foreign References:

JP2002166139A	2002-06-11
JP2004105876A	2004-04-08
JP2007083155A	2007-04-05
JP2005324118A	2005-11-24
JP2005230731A	2005-09-02
JPH10277572A	1998-10-20