| A major task of environmental protection is how to deal with the environmental pollution cost-effectively. One of effective ways to reduce cost and increase efficiency is making use of catalyst of stable performance in advanced oxidation technology. And studies and selections of catalyst have a significant impact on environmental pollution control. Therefore a research on application of Fenton catalyst that easy for magnetic separation was conducted in this paper. Electrolytic manganese slag is a kind of heavily polluting solid waste. However, some active ingredients of it have a catalytic effect on ozone oxidation. Based on principles of “waste control by waste” and “resource utilization of waste”, this paper made a research on the ozone catalyst, which was made from electrolytic manganese residue, and its application to industrial wastewater treatment.In Chapter I, an introduction of the present situation of industrial waste water, status of advanced oxidation technologies and electrolytic manganese slag was being made. And the purpose, significance and content of this study were also expounded.Chapter II covered the preparation of three magnetic carbon compounds, OMC@Fe, C@Fe3O4 and MGO, as well as characterization of them by means of XRD, TEM and TG. An experiment of adsorption of 4-CP, a simulating pollutant, is being conducted and results show a) the course of sorption kinetics of three composites are much in accordance with Lagergren model; b) the adsorption isotherm meet the Freundlich isotherm model better; and c) adsorption ability of three magnetic carbon composites as follow: C@Fe3O4>OMC@Fe>MGO. Then acid orange was taken as pollutant in the research of catalytic performance in Fenton reaction. By adding Orthogonal experimental design in the course of Fenton like degradation of OMC@Fe, we found impact factors of reaction within study range as(strong to weak) pH, the concentration of H2O2 and the concentration of catalyst. Light can improve the Fenton reaction in some degree; rising of temperatures also benefit to the reaction by lower pH limits. OMC@Fe has a good stability when using as catalyst in Fenton degradation of acid Orange, and can be recycled. Fenton like degradation of acid Orange by C@Fe3O4 further confirmed the conclusion that pH limits can be lowered by increasing temperature. While C@Fe3O4 is magnetic and can be easily recycled and reused by means of magnetic separation.And in Chapter III, we studied on degradation of X3 B by using manganese catalyst that made from electrolytic manganese slag and catalytic ozonation technology. Experiment shows manganese catalyst has the highest performance that was made from electrolytic manganese slag under conditions that a) concentration of potassium permanganate is 0.05 mol·L-1; b) adsorbing time period set to 24h; and c) burning temperature set to 400?. Catalytic ozonation of X3 B with manganese catalyst has advantages when compared with simple ozonation of pollutant and it's very stable. And mechanism discovered that catalyzed hydroxyl radicals and ozone-system are active species in the removal of pollutants. And by comparison of experiments we found the column reactor have higher reaction speed than others.Chapter IV is on the engineering practice of catalytic ozonation technology. In this part, through analysis of data collected from a sewage plant of chemical industrial park, a conclusion that ozonation technology contributes to the improvement of biodegradability of wastewater was draw. With a combination of this research, manganese dioxide was found as the catalyst that enhances the treatment efficiency. |
PDF Full Text Request