Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1999-03-30
2000-11-14
Simmons, David A.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210744, 210 86, 210205, 203 39, C02F 104
Patent
active
06146533&
ABSTRACT:
There is disclosed a method and an apparatus, of treating wastewater containing chemical substances, which comprises passing, into a continuous phase of water to be treated that has been formed by supplying raw water from an upper part of a tower, a supercritical fluid, from a lower part of the tower, to the upper part thereof, to bring the water to be treated and the supercritical fluid in countercurrent contact with each other, thereby separating the chemical substances from the water to be treated. These method and apparatus make it possible to treat wastewater containing chemical substances at a medium concentration, for which conventionally an effective physical or chemical treatment method is not found, efficiently without involvement of any secondary pollution.
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Rice, Paul N., Near Critical CO.sub.2 Extraction of Hazardous Organics From Acrylonitrile, Pesticide and Steel Mill Wastes, U.S. Department of Commerce National Technical Information Services, EPA/600/2-87/005, Jan. 1987, pp. iv.-vi. and 1-21 with Abstract.
Kato Yoshishige
Nakai Toshihiro
Sato Yoshio
Takahashi Nobuyuki
Director--General of Agency of Industrial Science and Technology
Morrison Betsey J.
Simmons David A.
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