Patent ID: 7662293

Claim:
A method for treating liquids, comprising: irradiating a flow of air and a flow of liquid to be treated at a same time in order to create ozone in both the air and the liquid; mixing the ozone-containing air with the liquid to be treated upstream of a liquid irradiating point; irradiating the flow of liquid containing the in-mixed ozone in order to break down the ozone in the liquid for producing free radicals; and exposing the liquid to at least one catalyst at the same time as the ozone is broken down for increasing an amount of free radicals, wherein the method is performed in an apparatus comprising: a container having an inlet and an outlet for the liquid to be treated; a UV generating light source capable of irradiating an inside of the container; air guidance means arranged inside the container, connected to an air source and capable of guiding air past said UV generating light source for creating ozone; and a mixing means arranged to said inlet conduit capable of mixing the created ozone with the liquid to be treated and at least one catalyst arranged in said container and positioned to be irradiated by said UV generating light source, which catalyst is capable of breaking down the ozone for increasing the amount of free radicals, and wherein substantially a whole of an inner surface is arranged with the catalyst.