Method for treating high-concentration ammonia nitrogen in leather wastewater

Abstract

The invention relates to a method for treating high-concentration ammonia nitrogen in leather wastewater, belonging to the field of wastewater treatment. The method comprises the following steps: mixing an organic composite denitrifier modified magnesium-aluminum-iron hydrotalcite magnetic nano adsorbing material and an adhesive in a mass ratio of 1:5 to obtain a viscous liquid, coating the viscous liquid to the surface layer of an adsorbing bar, drying, putting in an adsorption column, enabling the leather wastewater to flow through the adsorption column until the organic composite denitrifier modified magnesium-aluminum-iron hydrotalcite magnetic nano adsorbing material on the adsorbing bar surface adsorbs ammonia nitrogen to the saturated state, aging the surface layer of the magnesium-aluminum-iron hydrotalcite magnetic nano material by the organic composite denitrifier so that the aged adsorbing material surface layer sheds layer by layer under the actions of leather wastewater flow scour and external magnetic field, and finally, determining the ammonia nitrogen content in the wastewater. The method can not generate harmful gas or cause secondary environment pollution, and does not need to regenerate the adsorbing material. The ammonia nitrogen concentration in the treated wastewater is lower than 0.6 mg / L, and the removal rate is up to 99.99% above.

Description

technical field [0001] The invention discloses a method for treating high-concentration ammonia nitrogen in leather wastewater, belonging to the field of wastewater treatment. Background technique [0002] Leather wastewater contains pollutants such as oil, collagen, animal and plant fibers. Since tanning is a process of collagen fiber-protein processing, a large amount of skin protein is hydrolyzed, and with the ammoniation of protein in the wastewater, the concentration of ammonia nitrogen in the wastewater increases rapidly, and sometimes even the phenomenon that the concentration of ammonia nitrogen increases as the wastewater is treated . A large amount of high-concentration ammonia nitrogen wastewater is discharged into the water body, especially the slow-flowing lakes and bays, which will easily form a large number of algae and other microorganisms in the water, forming eutrophication pollution, causing black and odorous water bodies, quality decline, and nitrate and...

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide an organic composite denitrification agent modified magnesium in view of the fact that there is ammonia gas discharge in the process of treating high-concentration ammonia-nitrogen wastewater in the current organic composite denitrification agent combined with blow-off method, which causes secondary environmental pollution. Aluminum-iron hydrotalcite nano-magnetic adsorption material can absorb 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