Title:
WASTEWATER TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2019/131832
Kind Code:
A1
Abstract:
This waste liquid treatment method has: an aluminum dissolution step for dissolving aluminum into an acidic waste liquid and performing separation into a first treatment water and a heavy metal reduction deposit; a gypsum recovery step for adding a calcium compound to the first treatment water under liquid properties of pH 4 or below and performing separation into a second treatment water and gypsum; an aluminum and fluorine removal step for adding an alkali to the second treatment water and performing separation into a third treatment water and a sediment containing aluminum and fluorine; and a neutralization step for adding an alkali to the third treatment water and performing separation into an alkali neutralized treatment water and a neutralized deposit of a heavy metal hydroxide.
Inventors:
HARAGUCHI DAISUKE (JP)
HAYASHI HIROSHI (JP)
HAYASHI HIROSHI (JP)
Application Number:
PCT/JP2018/048041
Publication Date:
July 04, 2019
Filing Date:
December 27, 2018
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
C02F1/58; C01F11/46; C02F1/62; C02F1/70; C22B3/44; C22B3/46
Foreign References:
| JP2018079439A | 2018-05-24 | |||
| JPS62197192A | 1987-08-31 | |||
| JP2005270860A | 2005-10-06 | |||
| JP2016191119A | 2016-11-10 | |||
| JP2007196177A | 2007-08-09 | |||
| JP2017250885A | 2017-12-27 | |||
| JPS626287B2 | 1987-02-10 | |||
| JP2017105651A | 2017-06-15 | |||
| JPS5934644B2 | 1984-08-23 | |||
| JPH09192675A | 1997-07-29 |
Other References:
See also references of EP 3733613A4
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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