Abstract: A method for oxidation treatment of waste water material containing organic solid particles includes forming a discrete batch of waste water material, adjusting the pH of the entire batch to close to 7 or acid-alkaline neutral, and then flowing the batch through a reactor along with chlorine gas. The chlorine produces hypochlorous acid, which produces nascent oxygen and hypochlorite ions, for chemically oxidizing the organic solid particles and also forming minute gas bubbles, including nitrogen and carbon dioxide, which adhere to the particles. The treated material is flowed into a separation receptacle, where the gas bubble buoyed particles float to the surface of the water. The clear water is rapidly gravity-drained from beneath the particles, leaving the particles coalesced into a relatively dry, disinfected or stabilized sludge.