| abstract |
A water treatment system that a pair of series connected reactor vessels, each of which provides for flow of water to be treated through an annular treatment region that surrounds a longitudinally-extending source of ultraviolet radiation, has porous wall surrounding the annular treatment region, and an annular air/oxygen chamber between the porous wall and the exterior of the vessel. In one reactor, the ultraviolet source produces radiation having a wavelength in the range of about 185 nanometers, oxygen permeates through the porous wall as a fine bubble mist, the tangential aqueous stream shears the mist from the wall, the oxygen bubbles encounter UV light, and the oxygen is converted to ozone which in turn reacts with water in the water to produce hydrogen peroxide. In the other reactor, a layer of particulate anatase titanium dioxide is deposited on the interior surface of the porous wall, oxygen from the air/oxygen chamber is bubbled through the titanium dioxide layer into the circumstantially outer portion of the annular treatment region, and UV light activates the titanium dioxide to provide ionized dissolved oxygen in the outer portion of the annular treatment region. |