MnO2-Co2O3-CeO2-SnO2 deamination catalyst, and preparation method and application thereof

Abstract

The invention provides a MnO2-Co2O3-CeO2-SnO2 ammonium removal catalyst as well as a preparation method and application thereof. The MnO2-Co2O3-CeO2-SnO2 ammonium removal catalyst is composed of a carrier, an active component and a cocatalyst, wherein the active component and the cocatalyst are loaded on the carrier; the active component is MnO2; the cocatalyst is a Co2O3-CeO2-SnO2 compound; Co2O3, CeO2 and SnO2 are doped in MnO2. According to the composite ammonium removal catalyst, through the synergistic catalysis effect of the active components and the cocatalyst in the catalyst and the strong adsorption effect of the carrier on ammonium ions, other chemical reagents do not need to be added, auxiliary means such as photoelectricity do not need to be used, and ammonia nitrogen in wastewater can be efficiently converted into nitrogen only by utilizing dissolved oxygen in a water body.

Description

technical field [0001] The invention belongs to the technical field of ammonia nitrogen wastewater treatment, in particular to a MnO 2 -Co 2 o 3 -CeO 2 -SnO 2 Deammonization catalyst, preparation method and application. Background technique [0002] Urban domestic sewage is the product of urban development. With the acceleration of urbanization and industrialization, the output of municipal sewage is increasing, and the pollution is becoming more and more serious, which restricts the sustainable development of urban social economy. Therefore, the reasonable treatment of municipal sewage has been become the focus of research. Municipal sewage often contains a large amount of ammonia nitrogen compounds, the concentration of ammonia nitrogen is about 20-80mg / L, which belongs to low and medium concentration ammonia nitrogen wastewater. At present, for the oxidation and removal of low-concentration ammonia nitrogen in municipal sewage, there are mainly biological methods, b...

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Problems solved by technology

However, the oxidation product of the commonly used biological method is nitrate nitrogen, and the biological method is very sensitive to indicators such as temperature, pH, influent ammonia nitrogen concentration, and influent COD, resulting in unstable water production, total nitrogen or ammonia nitrogen in the produced water exceeds the standard; breaking point The chlorine addition method is a chemical method, which can completely oxidize low-concentration ammonia nitrogen into nitrogen gas, but the breakpoint chlorine addition method is prone to produce chlorine-containing organic by-products, and there is a risk of secondary pollution; the ozone catalytic oxidation method requires a large amount of energy to prepare ozone Moreover, most of the oxidation products are nitrate nitrogen, which is difficult to turn into nitrogen gas. At the same time, the efficiency of ozone catalytic oxidation is very low, and it is difficult to oxidize ammonium ions efficiently. The ammonia nitrogen in the produced water is unstable, and it is difficult to meet the requirements of municipal sewage ammonia nitrogen treatment.

The existence of these problems makes it difficult for the current municipal sewage treatment to meet the surface category III standard, which means that municipal sewage cannot be reused as a high-quality regenerated water source. For China, which is severely short of water, this is is a waste of water

[0003] In order to solve the above problems, the Chinese patent document CN105000722B provides a kind of active filter material preparation system for catalytic oxidation removal of ammonia nitrogen in water. The manganese dioxide catalytic membrane loaded on the quartz sand substrate is used to oxidize the ammonia nitrogen in groundwater, which solves the problem of biological method. It also solves the problem of instability of the produced water of ammonia nitrogen, and also solves the problem of additional oxidizing agents required for the treatment of ammonia nitrogen by the breakpoint chlorine method, which leads to increased costs and secondary pollution. It also solves the problem of large power consumption in the ozone catalytic oxidation method. problem, but the product after the oxidation treatment of this method is nitrate, not nitrogen, which cannot meet the requirement that the total nitrogen of the produced water is less than 1ppm; and the film formation process of this method is very slow, and it takes more than ten days or even a month; and this method The obtained manganese dioxide catalytic membrane loaded on the quartz sand base only has the catalytic effect of manganese dioxide, and the efficiency of catalytic oxidation of ammonia nitrogen is very low. It can only deal with the treatment of groundwater with ammonia nitrogen concentration of only 1-2ppm, and it is difficult to deal with higher concentrations (20- 80ppm) the treatment of ammonia nitrogen in municipal sewage

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