Study Of Performance And Application Of A Novel Ozone Catalyst Containing Manganese Oxide

In recent years, as the water pollution is seriously increasing, more species of pollutant organics that can be detected in water, leading requirements of advanced treatment. Ozone is widely used in many wastewater treatments due to its strong oxidation ability. However, ozone gradually causes more issues after it being deeper studied. For example, organics can’t be oxidized and decomposed well at a low concentration of ozone within a short time and the utilization of ozone is insufficient, as well as, the treatment cost is high. Therefore, the catalytic ozonation technology was developed aiming at the problems above. In this study, a novel preparation method of ceramsite catalyst with metal oxides was put up, which has the following favorable characteristics: simple fabrication technique, good catalytic effect, simplicity for industrial production, uniform distribution of active components, no easy leaking metal and low collateral contamination.In this study, benzonic acid was selected as simulation wastewater to conduct catalytic ozonation experiments. Benzoic acid which is a common organic pollutant can be found in the wastewater of chemical, food, pharmaceutical industry. It can inhibit the growth of microbe. The novel ozone catalyst used in this study was produced by a ceramsite factory in Jiangxi Province. XRD results showed that Mn was oxidized to Mn2O3 and Mn3O4 when manganese sulfate solution was used as the binder. Under the same conditions, removal effects of organic matter and ozone utilization rate in O3/catalyst system were far higher than that in O3/glass bead system. And the influence of adsorption was slight to the result of experiment, which could be neglected. The removal rate of benzonic acid decreased with initial concentration. Meanwhile, the influence of p H on catalytic ozonation experiment was also discussed, it showed that removal rate of benzonic acid increased with p H. Ozone utilization rate and multiplying effect of catalyst to contaminant disposal were significant under neutral condition, implying that the catalyst performed best under the neutral condition. Hydroxyl radical theory and adsorption theory was used to analyze experimental results and analysis results were verified through adding hydroxyl radicals inhibitors-tert-butanol. The results showed that the catalytic process was in agreement with radical mechanism. The novel ozone catalyst intensified the biodegradation of wastewater and shortened the processing time. The metal wastage rate, crushing rate, wear rate were low and the compressive strength was high during the process. Aforesaid features made novel ozone catalyst better suit in practical engineering application, leading to better water current strike resisitance and prolonged service life.The optimization of the active components of novel ozone catalyst and making process was studied. The results showed that Mn O2 which had a higher catalytic effect was created when potassium permanganate replaced manganese sulfate of solution as a binder. It could improve the removal efficiency of COD by 17% only at the expense of increasing the cost of 10.92yuan/t. Besides, the catalytic effects of catalysts made by different processes were significantly different. The catalytic effect of the disk grain making method was double than the cutting grain making method.Many application experiments and a pilot scale experiment in a textile printing and dyeing company were conducted in the study in order to test the catalytic effect of novel ozone catalyst in actual wastewater. The results showed that novel ozone catalyst had excellent catalytic effects on many organics. The catalytic effect on glucose, glycerin and potassium hydrogen phthalate increased 1.88, 1.31 and 1.15 times than before. Meanwhile, the results of the pilot scale experiment showed that novel ozone catalyst had excellent catalytic effects on actual wastewater by the significant increase of COD removal rate and chromaticity removal rate. It also effectively improved the biodegradability of the wastewater.