Preparation method and application of magnetic sludge-based ozone catalyst

Abstract

The invention discloses a preparation method of a magnetic sludge-based ozone catalyst. The preparation method comprises the following steps: (A1), mixing modified sludge with a manganese nitrate solution, standing for 2-48 hours, introducing ozone into the solution and stirring, placing reaction liquid in a reaction kettle in an oven and performing hydrothermal reaction at the temperature of 100-300 DEG C for 6-10 hours, naturally cooling to room temperature after the hydrothermal reaction, cleaning, and drying to obtain the sludge-based catalyst; and (A2) respectively preparing a FeCl3 aqueous solution and a FeSO4 aqueous solution, uniformly mixing the FeCl3 aqueous solution and the FeSO4 aqueous solution and sufficiently stirring so that the mol concentration ratio of the Fe<3+> to Fe<2+> in the mixed solution is 2: 1, adding ammonium hydroxide to the mixed solution and stirring to guarantee that the pH value is 11-12, adding the sludge-based catalyst and stirring, performing water-bath aging, rinsing and drying to obtain the magnetic sludge-based ozone catalyst. The preparation method is simple to operate, environmentally friendly, low in cost and has industrial application prospect.

Description

technical field [0001] The invention relates to a method for preparing a magnetic sludge-based ozone catalyst by utilizing excess sludge of a sewage treatment plant, and belongs to the technical fields of waste resource utilization and environmental engineering. Background technique [0002] With the continuous improvement of urban sewage treatment rate, the amount of sludge produced by sewage treatment plants is also gradually increasing, and the amount of sludge contained in every 10,000 tons of wastewater is as high as 6 to 7 tons. However, the investment and operating costs of sludge treatment are large, accounting for more than 50% of the total operating costs of the entire sewage plant. Therefore, it is of great practical and environmental significance to seek economical, efficient and safe sludge treatment and disposal technologies. Currently, the commonly used sludge disposal methods include landfill and incineration. Landfill not only occupies a large amount of la...

AI Technical Summary

Problems solved by technology

However, if this method is applied to porous carbonized sludge loaded with metal oxides to prepare ozone catalysts, there will be problems because the carbon in the carbonized sludge will be oxidized at high temperature to CO2 under high temperature and aerobic conditions. 2 And the disappearance of defects, at the same time, if anaerobic calcination is used, it is difficult to obtain a highly active metal oxide crystal form, because the calcination method is first impregnated with metal ions on the solid, and then calcined under oxygen conditions to obtain metal oxides , high temperature conditions are mainly used to obtain highly active crystal forms; and potassium permanganate reduction precipitation method has been widely used in the preparation of ozone catalysts due to its advantages of low energy consumption, mild reaction conditions, simple process and process control. Catalysts prepared by precipitation method have low activity

Images