Preparation method of supported ozone catalyst for treating steel wastewater

Abstract

The invention relates to a preparation method of a supported ozone catalyst for treating steel wastewater. An ozone catalyst is prepared through the steps that a double transition element-doped or double rare earth-doped ternary composite metal oxide precursor is prepared through a chemical precipitation method, washed, filtered, dried and then calcined for 4 h at the temperature of 350 DEG C, and the ternary ozone catalyst can be obtained; the supported ozone catalyst is prepared through the steps that after sodium alginate and the ternary ozone catalyst are mixed, a CaCl2 solution is dropwise added into the mixture, and immobilized ozone catalyst gel beads are formed. The immobilized ternary composite ozone catalyst gel beads prepared through the method are simple in preparation technology and low in cost, can effectively solve the problems that a suspended-state catalyst is difficult to recycle, causes secondary pollution to water and is poor in degradation effect, greatly shortens the reaction time and improves the COD removal efficiency.

Description

technical field [0001] The invention relates to a preparation method of a loaded ozone catalyst for treating steel wastewater, which can solve water pollution problems such as high organic content and high COD concentration, and is used in the field of water pollution treatment. Background technique [0002] The iron and steel industry is my country's basic industry, but the iron and steel industry is also an industry with high energy consumption, high resources and high pollution. It consumes a lot of water resources, accounting for about 14% of the national industrial water consumption. The rapid development of the steel industry has also exacerbated the real problems of water pollution and water shortage. The "Water Pollutant Discharge Standard for Iron and Steel Industry (GB13456-2012)" promulgated and implemented in 2012 also requires higher discharge standards for pollutants in wastewater from the iron and steel industry. The national emission standards require COD to...

AI Technical Summary

Problems solved by technology

It is aimed at iron and steel wastewater with high organic content and high COD concentration, which is difficult to meet the discharge standards stipulated by the state with existing treatment technologies. It proposes a method for preparing and using an ozone catalyst for treating iron and steel wastewater. Combined with ozone catalysis, it can effectively solve the problems of difficult recovery of suspended catalysts, secondary pollution of water quality and poor degradation effect, shorten the reaction time, improve the removal efficiency of COD, minimize energy consumption and save Material cost and operating cost, has great development potential and application prospect