A kind of preparation method and application of filter material for replacing struvite ore

Abstract

The invention relates to a preparation method and application of a filter chamber filter material replacing struvite mineral, and belongs to the technical field of wastewater treatment. The method comprises the following steps: with porous ceramisite with largish grain size as a carrier, and culturing a layer of magnesium ammonium phosphate crystals on the surface of the carrier by using heterogeneous and secondary nucleation effects under a certain condition so as to prepare the practical struvite filter material capable of being applied to engineering. The porous ceramisite is light in weight, good in chemical stability, enough in mechanical strength, large in porosity, large in specific area, strong in adsorption capability and relatively long in price, the porous ceramisite is cultured to prepare the struvite filter material, and has enormous market potential and economic benefit.

Description

technical field [0001] The invention relates to a preparation method of a filter material for removing and recovering nitrogen and phosphorus pollutants in waste water, which is suitable for the removal and recycling of ammonia nitrogen and phosphate pollutants in various waste water containing nitrogen and phosphorus, and belongs to waste water treatment technology field. Background technique [0002] At present, the treatment technologies for high-concentration ammonia nitrogen wastewater include biosynthetic nitrification method, ion exchange method, air steam stripping method, chemical precipitation method, etc., but all have shortcomings, such as high energy consumption and easy fouling of the gas stripping method. And post-treatment must be carried out, otherwise secondary pollution will occur; the adsorption method is controlled by the equilibrium process, it is impossible to remove a small amount of ammonia nitrogen in the wastewater, the ion exchange method uses a l...

AI Technical Summary

Problems solved by technology

[0002] At present, the treatment technologies for high-concentration ammonia nitrogen wastewater include biosynthetic nitrification method, ion exchange method, air steam stripping method, chemical precipitation method, etc., but all have shortcomings, such as high energy consumption and easy fouling of the gas stripping method. And post-treatment must be carried out, otherwise secondary pollution will occur; the adsorption method is controlled by the equilibrium process, it is impossible to remove a small amount of ammonia nitrogen in the wastewater, the ion exchange method uses a large amount of resin, and the regeneration is frequent, and the wastewater needs to be pretreated to remove suspended solids; biosynthesis Nitrification is a more economical and effective method at this stage. The process is relatively mature and has entered the field of industrial application. Slow, long sludge domestication time, the treatment effect on high-concentration ammonia nitrogen wastewater is not ideal; the conventional chemical precipitation method uses iron salt, aluminum salt, and lime method, which will produce a large amount of sludge, and the concentration and dehydration performance of these sludge is poor , adding difficulty to the whole process

The common disadvantage of the above methods is that the treated ammonia nitrogen cannot be recycled

However, struvite is traditionally produced in America and Africa, and its output in my country is relatively low; and its crystals are often equiaxed or wedge-shaped, short columnar, thick plate-shaped, irregular in shape; low in hardness, poor in mechanical strength, and easily broken; its ore The particle size of the powder is relatively small, it is easy to cause blockage of the filter in actual operation, and it is easy to be washed away during backwashing, so it is not of much value in engineering applications