Technology for treating waste water containing ammonia nitrogen

Abstract

The invention relates to the technology for treating waste water containing ammonia nitrogen and recovering ammonia in the industries, in particular to a technology for treating waste water containing ammonia nitrogen. In the conventional ion exchange method, the effulent liquid can not be recycled due to the over standard of ammonia and nitrogen of the effulent liquid caused by the untimely and inaccurate judgment of effulent liquid perforation points, the recycling value is low due to the low concentration of NH4 in stripping liquid, the ammonia nitrogen is required to be treated and the treatment cost is higher. The technology for treating waste water containing ammonia nitrogen comprises the following steps: waste water containing ammonia nitrogen is injected into a first exchange column filled with cation exchange resin, the material liquid effuses from the outlet of the first exchange column after being absorbed by the cation exchange resin and then flows into a second exchange column filled with cation exchange resin for further absorption, and the ammonia nitrogen concentration of the effluent liquid from the outlet of the second exchange column is less than 15 mg / L. The technology has low cost, and can comprehensively recover ammonia and continuously discharge by meeting the standards or recycle the waste water.

Description

technical field [0001] The invention relates to the treatment of various types of ammonia-nitrogen-containing wastewater in industry and the comprehensive recovery technology of ammonia, in particular to a treatment process of ammonia-nitrogen-containing wastewater in the wet smelting of tungsten and rare earth. Background technique [0002] At present, there is a large amount of ammonia emissions in the fields of industry and agriculture, especially the wet smelting of tungsten and rare earths uses a large amount of reagents containing ammonia and nitrogen, which makes the amount and concentration of ammonia nitrogen-containing wastewater in the process large, and most of the wastewater cannot be returned. Recycling, and only after high-cost treatment can the emission meet the standard. [0003] Nitrogen is a nutrient in water bodies. When the amount of ammonia nitrogen in the water body is excessive, it will cause eutrophication of the water body, causing aquatic plants s...

AI Technical Summary

Problems solved by technology

[0004] The traditional ion exchange method cannot timely and accurately determine the leakage point of the effluent (when the concentration of ammonia nitrogen in the effluent reaches 15mg / L, the feeding must be stopped, otherwise the discharge cannot meet the standard), resulting in the concentration of ammonia nitrogen in the effluent exceeding the standard and cannot be recycled. , and due to the NH adsorbed by the exchange resin 4 + Too little, resulting in NH in the desorption solution during desorption (regeneration) 4 + If the concentration is too low, the reuse value is not high, and further treatment is required, so the treatment cost is high