Method used for treating highly concentrated ammonia-nitrogen in rare earth waste water

Abstract

The invention relates to a method used for treating highly concentrated ammonia-nitrogen in rare earth waste water, and belongs to the field of highly concentrated ammonia-nitrogen treatment. According to the method, a sticky solution is prepared from a prepared organic composite denitrfying agent modified magnesium aluminum iron hydrotalcite magnetic nano adsorption material and an adhesion agent at a mass ratio of 7:1; the surfaces of adsorption rods are coated with the sticky solution, and the adsorption rods are dried under ventilation states and are delivered into an adsorption tower; a rare earth waste water penetrating fluid is delivered through the adsorption tower so as to adsorb 8000 to 12000mg / L highly concentrated ammonia-nitrogen in the rare earth waste water, wherein aging of adsorption material surface layers can be realized via adsorption saturation; under action of applied magnetic field and current scour, layer-by-layer falling of the adsorption material surface layers is realized, and at last the ammonia-nitrogen content of the rare earth waste water is detected. The method is capable of realizing adsorption material renewal; regeneration is not needed; the ammonia-nitrogen concentration of discharged waste water is controlled to be lower than 0.7mg / L; ammonia-nitrogen removing rate is higher than 99.99%; and no secondary pollution is caused to the environment.

Description

technical field [0001] The invention relates to a method for treating high-concentration ammonia nitrogen in rare earth wastewater, belonging to the field of high ammonia nitrogen wastewater treatment. Background technique [0002] The rare earth industry is an emerging industry. As people's awareness of environmental protection increases, the pollution problem of the rare earth industry has gradually attracted attention. Ammonia nitrogen pollutants are one of the three major waste waters produced in rare earth smelting. Ammonia nitrogen has certain harm to human body and water bodies. Ammonia nitrogen in the water quality index is an important pollutant that causes water eutrophication and environmental pollution. It can make water lose its self-purification function, and it enters the human body to synthesize nitroso compounds, which induce cancer. When the ammonia nitrogen content in drinking water is too high Can cause gastrointestinal disorders and endemic diseases. ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to provide an organic compound denitrification agent modified magnesium-aluminum molten iron in view of the discharge of ammonia gas in the process of treating high-concentration ammonia-nitrogen wastewater in the process of blowing off the organic compound denitrification agent, which causes secondary environmental pollution. Talc nano-magnetic adsorption material, adsorbs high concentration ammonia nitrogen in wastewater, and can age the surface layer of the adsorption material after saturation. Under the action of external magnetic field and water flow, the adsorption material can be renewed without regeneration