Coal-ash-based ozone oxidation catalyst and preparation method and application thereof

Abstract

The invention provides a coal-ash-based ozone oxidation catalyst and a preparation method and application thereof. According to the coal-ash-based ozone oxidation catalyst, coal ash serve as a carrier, and transition metal or transition metal oxide or salt serves as an active component, wherein the mass ratio of the coal ash to the transition metal is (5-20): 1; the transition metal is selected from one or more of cobalt, titanium, copper, iron, manganese, zinc and nickel. According to the ozone oxidation catalyst, the coal ash serves as the carrier, solid waste resources can be recycled, and materials are low in cost and wide in source; the catalyst is high in catalytic activity, great in water quality fluctuation resistance and capable of effectively degrading high concentrated organic wastewater, the COD removal rate reaches 70-90%, biodegradability (BOD / COD) of waste water is raised to 0.50-0.80, the application scope is wide, and the coal-ash-based ozone oxidation catalyst and the preparation method and application thereof are applicable to biochemical pretreatment and deep treatment of multiple types of waste water.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a fly ash-based ozone oxidation catalyst and its preparation method and application. Background technique [0002] Advanced Oxidation Technology (AOT), also known as Deep Oxidation Technology, uses highly oxidizing hydroxyl radicals (OH) to decompose difficult-to-degrade large Molecular organic substances are oxidized into low-toxic or non-toxic small molecular substances. The ozone oxidation method used in wastewater treatment has no permanent residue, strong oxidation, fast reaction speed, and no secondary pollution. Ozone in wastewater is easy to decompose, which increases dissolved oxygen in water, but the solubility of ozone in water is low, and the utilization rate is generally low. More than 30%. Ozone catalytic oxidation technology uses ozone to generate active hydroxyl radicals on the surface of the catalyst. This method has a fast reaction speed and mild conditions...

AI Technical Summary

Problems solved by technology

As a catalyst carrier, alumina is not resistant to acid and alkali, and the catalytic active components are easy to lose; as a catalyst carrier, activated carbon needs to be protected by an inert atmosphere during the preparation process, and the cost of activated carbon is high, which is not conducive to large-scale production and wastewater treatment applications

Most of the existing ozone oxidation catalysts are suitable for the advanced treatment section of wastewater treatment. The scope of application to wastewater types is relatively small, and the adaptability to water quality fluctuations is poor. Especially in the field of high-concentration organic wastewater applications, there are few reports