Apparatus and Method for Dissolution of Ozone in Water and Catalytic Oxidation
AssigneeAir Products and Chemicals, Inc.
InventorVipul P. Dholakia
Life of this patent
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Abstract
A system and method for oxidation treatment of water in which ozone gas is dissolved in water by passing a mixed gas-liquid stream through a monolith at an elevated pressure that is close to the preferred gas output pressure for an ozone generator. The monolith is preferably contained at least partially within a gas-liquid separator vessel. Advanced oxidation is optionally provided by injecting hydrogen peroxide and/or embedding a catalyst on the monolith. At least a portion of the treated water is preferably recycled in order to increase total ozone dosing in the effluent stream.
Claims20
A method for treating water, the method comprising:
- (a) introducing water into a pre-treatment stream;
- (b) generating a gas stream containing at least 3% ozone gas;
- (c) introducing the gas stream into the pre-treatment stream at an injection point, resulting in a mixed-phase stream comprising ozone gas and water;
- (d) passing the mixed-phase stream through a monolith located downstream from the injection point, resulting in a reaction product in which at least a portion of the ozone gas is dissolved into the water;
- (e) separating any undissolved gas in the reaction product from a liquid-phase portion of the reaction product;
- and
- (f) diverting at least a portion of the liquid-phase portion of the reaction product to an effluent stream.
A water treatment system comprising:
- a water supply line;
- an ozone generator for generating an output gas stream containing ozone;
- an ozone supply line that is configured to carry the output gas stream from the ozone generator and to connect to the water supply line at an injection point;
- a monolith having an outlet end and an inlet end that is downstream from the injection point and is in flow communication with the water supply line;
- a vessel that is in flow communication with the outlet end of the monolith;
- a gas purge line located on the vessel;
- a vessel output line located on the vessel for extracting liquid from the vessel, the vessel output line being positioned below the gas purge line;
- and
- an effluent port located on the vessel output line.
Dependencies are inferred from the claim text.