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US 5,997,751 AGranted
Method and apparatus for treating aqueous medium containing organic matter
AssigneeEbara Corporation
InventorsTsutomu Higo, Roberto Masahiro Serikawa, Kazuhiro Kondo
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Abstract
A hydrothermal reaction is performed on an aqueous medium without adding an oxidizing agent, and then another hydrothermal reaction is performed in the presence of an oxidizing agent, thereby reducing a chemical oxygen demand of the aqueous medium. An apparatus for performing a hydrothermal reaction has a fluid inlet being capable of introducing an oxidizing agent in a fluid form during a hydrothermal reaction.
Claims12
A method for hydrothermally treating an aqueous medium containing organic matter, comprising the steps of:
- a. subjecting the aqueous medium without adding an oxidizing agent at a first temperature ranging from 200.degree. C. to 374.degree. C. to a pressure of not less than a vapor pressure of the aqueous medium at the first temperature;
- and then
- b. subjecting the aqueous medium with an oxidizing agent in an amount sufficient for decreasing a chemical oxygen demand of the aqueous medium at a second temperature ranging from 200.degree. C. to 374.degree. C. to a pressure of not less than a vapor pressure of the aqueous medium at the second temperature,
- steps a. and b. being performed in the same reaction vessel.
1 more element
Dependencies are inferred from the claim text.