Login| Sign Up| Help| Contact|

Patent Searching and Data


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)
Application Number:
JP2018/048041
Publication Date:
July 04, 2019
Filing Date:
December 27, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
C02F1/58; C01F11/46; C02F1/62; C02F1/70; C22B3/44; C22B3/46
Foreign References:
JP2018079439A2018-05-24
JPS62197192A1987-08-31
JP2005270860A2005-10-06
JP2016191119A2016-11-10
JP2007196177A2007-08-09
JP2017250885A2017-12-27
JPS626287B21987-02-10
JP2017105651A2017-06-15
JPS5934644B21984-08-23
JPH09192675A1997-07-29
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
Download PDF: