Ozone Catalytic Oxidation Treatment Of Organic Waste Water And Gas-Liquid Simulation

Using ozone catalytic oxidation process to treat different COD organic waste water,The results showed that the factors affecting the removal effect were ozone concentration,ozone gas volume,waste water velocity and ozone dosage.Ozone dosage played the leading role as the data demonstrated.In the treatment of low COD organic waste water,the best conditions as below:ozone concentration was 20-40 mg/L,ozone gas volume was 16 L/h,water speed was 4 L/h,ozone dosage was 50 mg/L.the COD of waste water could be less than 30 mg/L,chroma 20 close to color-less,corresponded to the national waste water emission level 1A,and the COD removal rate was usually more than 40%.In the treatment of higher COD organic waste water,the research results showed that the ozone catalytic oxidation process can be placed in front of the biochemical system,using its effective reduction of COD and chroma,further more,it could enhance the biochemical capacity greatly,the data showed that after the ozone oxidation process,The BOD5/COD ratio was 7 times higher than the origin waste water.This process could be seen as a bright future for the important supplement of the high COD waste water treatment system.According to the best technological conditions and the actual requirements of daily water treatment,I designed three sizes bubble tower and used FLUENT 15.0 to simulate its gas-liquid two-phases flow situation,respectively,the high diameter ratio H/D was 1,1.5 and 2.The results showed that the gas-liquid distribution in the tower with the height ratio of H/D of 1.5 was the most uniform and stable,the pressure in the tower decreased regularly in the axial direction,and the gas-liquid phase Volume fraction was about 50%,this could provide theoretical guidance for the future industrial applications.