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Patent Searching and Data


Title:
WASTEWATER TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2019/131827
Kind Code:
A1
Abstract:
Provided is a waste liquid treatment method comprising: an aluminum dissolution step of dissolving aluminum in an acidic waste liquid and separating into a first treated water and a heavy metal reduced precipitate; a gypsum recovery step of adding a calcium compound at a pH of 4 or less to the first treated water and separating into a second treated water and gypsum; a heavy metal coprecipitation step of adding a ferric compound to the second treated water and separating into a third treated water and a heavy metal co-precipitate; an aluminum and fluorine removal step of adding an alkali to the third treated water and separating into a fourth treated water and a deposit including aluminum and fluorine; and a neutralization step of adding an alkali to the fourth treated water and separating into alkali-neutralized treated water and a neutralized deposit of heavy metal hydroxides.

Inventors:
HARAGUCHI DAISUKE (JP)
HAYASHI HIROSHI (JP)
Application Number:
JP2018/048026
Publication Date:
July 04, 2019
Filing Date:
December 27, 2018
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP (〒1008117, JP)
International Classes:
C02F1/58; C01F11/46; C02F1/28; 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
JP2000117265A2000-04-25
JP2017159222A2017-09-14
JP2017250886A2017-12-27
JPS626287B21987-02-10
JP2017105651A2017-06-15
JPS5934644B21984-08-23
JPH09192675A1997-07-29
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (〒1006620, JP)
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