Ammonium removal ultrafiltration membrane for non-photoelectric response oxidation degradation of ammonia nitrogen, preparation method and application in sewage deammonization

Abstract

The invention provides an ammonium removal ultrafiltration membrane for non-photoelectric response oxidation degradation of ammonia nitrogen, a preparation method and its application in sewage deammonization, belonging to the technical field of ammonium removal ultrafiltration membrane, including basement membrane support layer and separation layer; the separation layer contains MnO 2 / SnO 2 Composite material MS, the base film support layer is a non-woven fabric soaked with saturated potassium permanganate and saturated stannous chloride solution. The present invention provides MnO 2 SnO 2 , improves the catalytic ability, and can oxidize ammonia nitrogen without any external means such as photoelectricity and without adding chemicals, with low energy consumption and cost savings; the deammonization ultrafiltration membrane has double oxidation of ammonium ions in water, which can effectively degrade the ammonium in wastewater Ammonia nitrogen ensures that the ammonia nitrogen in the produced water is less than 1mg / L, which meets the requirements of Class III water on the surface; effectively avoids secondary pollution, and can oxidize and remove ammonium ions during the process of water passing through the membrane, with high efficiency and no performance attenuation; The components are loaded on the membrane, and the active sites are exposed on the surface of the membrane, which reduces the amount of catalyst used.

Description

technical field [0001] The invention relates to the technical field of ammonium removal ultrafiltration membranes, in particular to an ammonium removal ultrafiltration membrane for non-photoelectric response oxidation degradation of ammonia nitrogen, a preparation method and its application in sewage deammonization. Background technique [0002] For the treatment of low-concentration ammonia nitrogen in municipal sewage, besides the commonly used biological method, ion exchange method, and breakpoint chlorination method, photocatalytic oxidation and electrochemical oxidation are currently used. [0003] The break point chlorination method is to add chlorine gas or sodium hypochlorite to the wastewater to oxidize the ammonia nitrogen in the wastewater into N 2 A chemical denitrification method, the free chlorine content in the water reaches the minimum when the chlorine gas is passed into the wastewater to reach the breaking point, and the concentration of ammonia can be redu...

AI Technical Summary

Problems solved by technology

This method can selectively convert ammonia nitrogen into N by controlling the amount of chlorine added. 2 Discharge, stable treatment, easy to use, but the breaking point in this method is difficult to grasp and in practical applications, in order to completely oxidize and decompose ammonia nitrogen in sewage, the dosing ratio of chlorine gas and ammonia nitrogen is often increased, which will make the wastewater after ammonia nitrogen treatment The residual chlorine in the middle will seriously exceed the standard, and at the same time it will increase the salinity of the wastewater, causing secondary pollution

[0004] The ion exchange method uses the exchangeable ions on the solid ion exchanger and the ammonium ions in the solution to exchange, and the ammonium ions are adsorbed on the ion exchanger, thereby achieving the purpose of removing ammonia nitrogen in the solution. This method can selectively It removes ammonia nitrogen without producing toxic by-products such as nitrate nitrogen and nitrite nitrogen. In the process of ammonium removal, the exchange material needs to be regenerated frequently, the regeneration cost is high, the difficulty is great, and the exchange capacity will decrease after regeneration, resulting in a decrease in the removal rate of ammonia nitrogen, which limits its engineering application

[0005] Biological treatment of ammonia nitrogen wastewater is generally achieved by microbial nitrification and denitrification, and the process is mature. However, under the influence of microorganisms, ammonia nitrogen is converted into nitrogen and often accompanied by the generation of NO 3 - , affecting the quality of effluent water and additional organic carbon sources and alkalinity need to be added during the operation process. The investment and operating costs are high. This method will also generate a large amount of sludge in the treatment of ammonia nitrogen. Improper treatment can easily cause secondary pollution. In addition, it is affected by waste water. Affected by factors such as temperature, pH, and nutrients, the ammonia nitrogen in the produced water will fluctuate and have poor stability, which limits its development in water treatment.

[0006] The photocatalytic oxidation method and the electrochemical oxidation method need auxiliary means such as photoelectricity, and the energy loss is large, and the oxidation ability of the two methods is limited, and additional sodium chloride, H 2 o 2 Such as chemical agents to improve their oxidation ability to achieve the purpose of degrading ammonia nitrogen, which not only increases the cost but also easily causes secondary pollution. In addition, the photocatalytic oxidation method, due to the limited utilization of light by the material, can be used in the case of a large amount of water treatment , it is difficult to ensure that the ammonia nitrogen in the produced water is stable below 1ppm, and in the oxidation process, not only intermediate products such as OH participate in the degradation of ammonia nitrogen, but also the photogenerated electrons and holes themselves will participate in the redox reaction. The degree of reaction is different, and there will be Nitrate or nitrite is a by-product that is more harmful to the environment. In addition, in order to improve the ability to treat ammonia nitrogen in water, it is often necessary to increase the amount of materials used, resulting in increased costs and seriously affecting its application.

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