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AssigneeDirector-General of Agency of Industrial Science and Technology
InventorsToshihiro Nakai, Yoshio Sato, Nobuyuki Takahashi, Yoshishige Kato
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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.
A method of treating wastewater containing chemical substances, comprising 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, wherein the tower comprises a plurality of slender columns and has longitudinally therein at least one slender column with a cross-sectional area of 30 cm.sup.2 or less.
An apparatus for treating wastewater containing chemical substances, which comprises a tower, in which tower raw water can be supplied from an upper part thereof, a supercritical fluid can be supplied from a lower part thereof, treated water can be discharged from the lower part, and the supercritical fluid containing chemical substances can be discharged from the upper art, and which comprises a means capable of controlling the water level in the tower to a certain level, wherein the tower can form therein a continuous phase of water to be treated, and the water to be treated in the form of the continuous phase and the supplied supercritical fluid are brought in countercurrent contact with each other, thereby separating the chemical substances from the water to be treated, wherein the tower comprises a plurality of slender columns and has longitudinally therein at least one slender column with a cross-sectional area of 30 cm.sup.2 or less.
Dependencies are inferred from the claim text.