Technology for efficiently removing ammonia nitrogen from phosphorus-fluorine sewage containing ammonia nitrogen

Abstract

The invention discloses a technology for efficiently removing ammonia nitrogen from phosphorus-fluorine sewage containing ammonia nitrogen. The technology can be combined with a traditional process for removing phosphorus and fluorine by using lime milk to efficiently and cheaply remove ammonia nitrogen in sewage and remove phosphorus and fluorine in water. The technology is obtained by optimizingand innovating a traditional chemical precipitation technology. The technology makes the ammonia nitrogen removal rate reach 97% or above and the content of ammonia nitrogen of effluent water controlled within 10 ppm when the ammonia nitrogen content of raw water is within 350 ppm, the effluent water meets the related requirements of Discharge Standard of Water Pollutants for Phosphate FertilizerIndustry (GB15580-2011), and the treatment cost can be controlled within 2 yuan / ton and is far lower than that of the traditional process. The P2O5 content in slag produced by the new technology is high, and the slag can be recycled as a composite fertilizer. The technology adopting a two-stage ammonia nitrogen removal process has the characteristics of low investment, low operation cost, simplicity in operation, and stability in operation, and is universally suitable for treating phosphorus-containing ammonia nitrogen wastewater in the phosphate fertilizer industry.

Description

technical field [0001] The invention relates to phosphate fertilizers, in particular to a treatment technology for phosphorus-containing, fluorine, ammonium and nitrogen sewage. Background technique [0002] Because the phosphate fertilizer industry generally involves ammonium phosphate and anhydrous hydrogen fluoride products, the phosphorus and fluoride wastewater in the phosphate fertilizer industry contains a relatively high concentration of ammonia nitrogen. Taking Wengfu Chemical Company as an example, the ammonia nitrogen content in the acidic phosphorus and fluorine wastewater reaches about 350ppm. The surrounding phosphorus and fluorine industry The ammonia nitrogen content in the wastewater was high. [0003] At present, the methods for removing ammonia nitrogen in phosphate wastewater include stripping method, membrane separation method, break point chlorination method, ion exchange method and chemical precipitation method. [0004] The stripping method is to adj...

AI Technical Summary

Problems solved by technology

Existing literature shows that in order to maximize the removal rate of ammonia nitrogen, it is necessary to maintain the ratio n(NH 4 + ): n(Mg 2+ ): n(PO 4 3+ )=1:1.4:1, when the initial concentration is 200ppm, the effluent concentration is 18-30ppm, and the removal rate is about 88%. It is impossible to remove the ammonia nitrogen in place at one time, and a deep ammonia nitrogen removal process is required to remove the ammonia nitrogen in the water to the discharge standard within

The existing literatures all use one-time reaction to remove ammonia nitrogen, which makes the effect of removing ammonia nitrogen not meet the emission standards, which limits the wide application of this process

Images