Development of very high efficiency ozonizer using thin film dielectric

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Ozone is one of the strongest oxidizing and bleaching agents without residues that could be harmful to the environment. For this reason, ozone has been used for a variety of applications such as bleaching, deodorization, and disinfection of water and atmospheric air. Due to those properties a great number of papers were devoted to ozone generation in order to improve efficient. It is well known that there are four important parameters to improve ozone generation rate; discharge gap length, gas temperature, discharge uniformity and surface of the dielectric barrier. We investigate the ozone generation rate as the parameters of quality of dielectric barrier include the surface morphology of the dielectric barrier. Experimental results suggest that ozone density is increased with increasing discharge voltage and decreasing dielectric thickness. The maximum ozone generation efficiency of our system is 340 g/kWh. Ozone generation rate using several thin film dielectric on the Pyrex glass or … More Al_2O_3 as dielectric barrier were higher than that using normal Pyrex glass or Al_2O_3. The ozone generation rate was depend on the dielectric ratio of the thin film, and that was 3.5 times higher using BaTiO_3 thin film dielectric.Ozone and ceramic filter treatment for the waste water purification was applied at all places of the sedimentation tank. We installed the ozone treatment system at the entrance of the primary sedimentation tank, the exits of the primary sedimentation tank and the final sedimentation tank in this experiment. Ozone density for the waste water treatment was 8.3 g/m3. Ozone was dissolved in the waste water of 500 ml. Experimental results show that turbidity and color unit decrease with ozone treatment time at any place of the sedimentation tank. They decrease drastically to 20 min, and after that they are saturated. Chemical oxygen demand (COD) also decreases from 66.9 g/l to 51.3 g/l after 20 min ozone treatment at the entrance of the primary sedimentation tank. Number of colon bacillus decreases to zero after 3 min ozone treatment. These experimental results suggest that ozone treatment is effective for waste water purification at any sedimentation tank. In addition, ozone treatment with ceramic filter is effective to decrease turbidity and color unit drastically. Less