Method for treating ammonia nitrogen wastewater

Abstract

The invention provides a method for treating ammonia nitrogen wastewater, which relates to a method for treating the ammonia nitrogen wastewater by using an adsorption method. The method is characterized in that in the treating process, a natural manganese mineral is used as an adsorbent to perform adsorption reaction with the ammonia nitrogen wastewater so as to remove the ammonia nitrogen in thewastewater. The natural manganese mineral is crushed into a manganese mineral adsorbent of 0-2 millimeters, the pH value of the wastewater containing the ammonia nitrogen is adjusted to be between 2and 12 by using acid or alkali, then the manganese mineral adsorbent contacts and is mixed with the ammonia nitrogen wastewater to perform adsorption, and the adsorption can be performed by adopting afixed bed adsorption column or in a stirring and mixing mode. When the fixed bed adsorption column is adopted for adsorption, the manganese mineral after being crushed is classified to remove fine particles for the best so as to improve the permeability of the adsorption column; and in the same way, when the stirring and mixing mode is adopted, the manganese mineral after being crushed is classified to remove coarse particles for the best so as to reduce the abrasion to equipment. The natural manganese mineral applicable to the method comprises a terrestrial manganese oxide mineral, an oceanpolymetallic nodule, an ocean cobalt-rich incrustation and a terrestrial manganese nodule, the natural manganese minerals usually contain manganese minerals of cryptomelane, todorokite, birnessite, vernadite, rancieite, pyrolusite and the like, have good pore structure and large specific surface area so as to have good adsorption property, and can be used as the adsorbent for treating the ammonianitrogen wastewater after being crushed into certain particle size, and the manganese minerals have the advantages of simple process, easy reproduction and stable performance.

Description

technical field [0001] A method for treating ammonia nitrogen wastewater relates to a method for treating ammonia nitrogen wastewater by using an adsorption method. Background technique [0002] Ammonia nitrogen is an important pollutant in water bodies, mainly from various industrial wastewater and urban domestic sewage. Excessive ammonia nitrogen content in water not only deteriorates the quality of the water environment, causes eutrophication, and causes black and odorous water bodies, but also increases the difficulty and cost of water treatment, and even produces toxic effects on people and organisms. There are roughly two sources of ammonia nitrogen in industrial wastewater: one is that during resource processing, nitrogen in raw materials enters wastewater in the form of ammonia, such as light industry, petrochemical, coking and other industries; the other is that ammonia is widely used as a neutralizer or precipitant It is used in non-ferrous metallurgy, chemical in...

AI Technical Summary

Problems solved by technology

[0007] The adsorption method uses a porous adsorption material with strong selectivity to ammonia ions to absorb ammonia in the wastewater, so as to achieve the purpose of removing ammonia nitrogen. The adsorption method has the advantages of low investment, simple process, small footprint, and convenient operation. It is especially suitable for For the treatment of medium and low concentration ammonia nitrogen wastewater, commonly used adsorption materials include activated carbon, zeolite, montmorillonite, etc., but the exchange capacity of existing adsorbents is small, if the treatment of medium and high concentration ammonia nitrogen wastewater will inevitably result in frequent desorption and increase costs