A kind of preparation method and application of surfactant-modified metal oxide catalyst

Abstract

The invention discloses an application method of a surfactant-modified metal oxide catalyst. The specific steps of the application method are: adjusting the pH of low-ammonia-nitrogen wastewater with an initial concentration of 25-80 mg / liter to 5-10, and adjusting the pH according to the low Add 0.6-1.6 mg / L of surfactant-modified metal oxide catalyst to the volume of ammonia-nitrogen wastewater, and then magnetically stir the solution at a stirring speed of 450 rpm, while feeding a flow rate of 4-24 mg per liter of solution Ozone per minute, react at room temperature for 30 to 180 minutes. This application method can make full use of the soft template effect and stable dispersion effect of the surfactant, thereby effectively regulating the size, surface energy and dispersibility of the catalyst particles in different media, thereby improving the catalytic performance of the catalyst in ozone oxidation of low ammonia nitrogen wastewater. activity and its selective conversion to N 2 The efficiency makes it possible to catalyze ozone oxidation of low-ammonia nitrogen wastewater at normal temperature and pressure, and at the same time selectively convert ammonia nitrogen into N 2 .

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a preparation method and application of a surfactant-modified metal oxide catalyst. Background technique [0002] At present, the commonly used treatment methods for low ammonia nitrogen wastewater in industrial wastewater mainly include ion exchange method, break point chlorination method, biological method, etc. These methods have their own characteristics, but they also have certain defects. Among them, the ion exchange method has the disadvantages of small adsorption capacity and frequent regeneration; the breakpoint chlorination method has high treatment costs, and the by-products of chloramine and chlorinated organic matter will cause secondary pollution; the nitrification product of the biological method NO 3 — to be converted to N by anaerobic organisms 2 , and in the presence of components such as salt and heavy metals, the activity of microor...

AI Technical Summary

Problems solved by technology

Among them, the ion exchange method has the disadvantages of small adsorption capacity and frequent regeneration; the breakpoint chlorination method has high treatment costs, and the by-products of chloramine and chlorinated organic matter will cause secondary pollution; the nitrification product of the biological method NO 3 — to be converted to N by anaerobic organisms 2 , and in the presence of components such as salt and heavy metals, the activity of microorganisms will be inhibited. In addition, the biological method also has shortcomings such as the need to strictly control pH, nutrient sources, and wastewater temperature.

[0003] In addition, there is a wet catalytic oxidation method for the treatment of low ammonia nitrogen wastewater, but this method requires relatively harsh reaction conditions, such as high temperature and high pressure, and even requires the use of noble metals as catalysts for catalytic reactions

However, if it is oxidized by heterogeneous catalytic ozone, it can realize the advantages of simple operation, easy separation of the catalyst, repeatable regeneration, and no secondary pollution. , ammonia nitrogen is converted to N 2 The efficiency is not high, and there are no related reports, documents and patents on ozonation of low-ammonia-nitrogen wastewater by using a non-noble metal as a catalyst under normal temperature and pressure.

Images