Title:
METHOD AND DEVICE FOR TREATING SALINE WASTEWATER
Document Type and Number:
WIPO Patent Application WO/2014/007032
Kind Code:
A1
Abstract:
A method and device for treating saline wastewater are provided with which saline wastewater, e.g., accompanying water from gas field drilling, can be highly efficiently converted into an effectively utilizable substance in high yield at low cost with reduced environmental burdens.
Saline wastewater which contains sodium chloride is concentrated by separating water from the saline wastewater to thereby produce high-concentration saline wastewater. The high-concentration saline wastewater is introduced into the positive-electrode-side chamber of an electrolytic tank which includes a positive electrode and a negative electrode that have been separated by a semipermeable membrane that is permeable to sodium ions, and electrolysis is then conducted to yield sodium hydroxide in the high-concentration saline. This sodium hydroxide is brought into contact with a gas discharged from a gas-turbine power generator or engine power generator which has been disposed in order to obtain electric energy for operating either the plant from which the saline wastewater is discharged or the device for treating the saline wastewater, thereby obtaining an aqueous solution containing sodium carbonate and/or sodium hydrogen carbonate. The sodium carbonate and/or sodium hydrogen carbonate is separated and recovered from this aqueous solution. As the electrolytic tank, use is made of an electrolytic device having a serial multistage configuration.
Inventors:
MATSUO TOSHIAKI (JP)
SASAKI HIROSHI (JP)
YAMAMOTO HIROKI (JP)
OKISHIRO KENJI (JP)
HATANO AYUMI (JP)
HATAMIYA SHIGEO (JP)
SASAKI HIROSHI (JP)
YAMAMOTO HIROKI (JP)
OKISHIRO KENJI (JP)
HATANO AYUMI (JP)
HATAMIYA SHIGEO (JP)
Application Number:
PCT/JP2013/066137
Publication Date:
January 09, 2014
Filing Date:
June 12, 2013
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
C25B1/46; B01D53/62; C01D7/07; C25B15/08
Domestic Patent References:
| WO2012008014A1 | 2012-01-19 |
Foreign References:
| JP2011056345A | 2011-03-24 | |||
| JP2008223115A | 2008-09-25 | |||
| JPS54120297A | 1979-09-18 | |||
| JPS53119298A | 1978-10-18 |
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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