System and method for removing organic compounds from waste water by oxidation

Abstract

The present invention relates to a process and a system for processing waste water containing organic compounds. The system includes a UV/ozone oxidation removal module, or one or more removal modules connected in series whereas such a serial connection can be continuous or discontinuous. A UV/ozone oxidation removal module mainly includes an ozone generator, an ozone injector, an ozone dissolution tank, an ozone decomposition device, a UV reaction tank, a recycling pipeline. The efficiency of the UV/ozone oxidation removal module is controlled by the recycling ratio, the ozone concentration, and the intensity of UV light.

1 - 6 . (canceled)  
     
     
         7 . An oxidation removal method for removing organic compounds from waste water comprising the following steps: 
 a) mixing a to-be-treated water with an ozone source gas to form a mixture with an ozone concentration of 3-100 ppm;    b) introducing the ozone/waste water mixture from Step (a) into an ozone dissolution tank to perform an ozone dissolution and oxidation reaction for a residence time of 10-150 seconds;    c) allowing the resulting ozone-treated water directly from said ozone dissolution tank to flow through a UV reaction tank wherein the ozone-treated water receives a UV radiation such that organic compounds in the ozone-treated water undergoes a photochemical oxidation; and    d) discharging a portion of the resulting UV-radiated water from said UV reaction tank to the next treatment stage, and recycling the remaining portion of the UV-radiated water to be a portion of said to-be-treated water in Step (a), wherein the flow rate ratio of the recycled water to the discharged water is 0.5:1-20:1.