Method for electrolytically treating high ammonia-nitrogen wastewater

Abstract

The invention discloses a method for electrolytically treating high ammonia-nitrogen wastewater. The method comprises the following steps: 1) injecting the high ammonia-nitrogen wastewater into an electrolytic tank, and performing electrolysis; and 2) pumping out a liquid product at the cathode of the electrolytic tank in the process of electrolysis, and adding the liquid product into the anode ofthe electrolytic tank. According to the method disclosed by the invention, the removal rate of ammonia nitrogen in the high ammonia-nitrogen wastewater can be effectively improved by utilizing the method.

Description

technical field [0001] The invention relates to the field of high ammonia nitrogen wastewater treatment, in particular to a method for electrolytically treating high ammonia nitrogen wastewater. Background technique [0002] With the development of industrialization, the discharge of industrial high-ammonia-nitrogen wastewater is increasing, and the harm it brings is becoming more and more serious. In recent years, with the increase of environmental protection requirements, the requirements for the content of ammonia nitrogen in the discharged wastewater have become more and more stringent. For high ammonia nitrogen wastewater, in order to effectively remove ammonia nitrogen, many experts at home and abroad have conducted various researches on it. The mainstream technologies include: ammonia stripping method, chemical precipitation method, ion exchange method, breakpoint chlorination method, biological Nitrogen removal, etc. [0003] The above methods can achieve good resul...

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Problems solved by technology

[0003] The above methods can achieve good results in the treatment of light industry, agriculture or domestic sewage, but the treatment of desulfurization wastewater with high ammonia nitrogen in power plants is less effective

This is due to the high content of ammonia nitrogen and high salt content in the desulfurization wastewater of power plants, among which Ca 2+ , Mg 2+ , Fe 2+ / Fe 3+ The content of ions with scaling tendency is high. When using the above methods to treat high ammonia nitrogen desulfurization wastewater from power plants, there are various problems: the ammonia stripping method is prone to scaling in the stripping tower, and the energy consumption is high; the struvite method is affected by Ca 2+ The influence of other salts, resulting in the inability to convert NH 4 + Complete precipitation; ion exchange leads to frequent resin replacement, and the oxidant content consumed by the breakpoint chlorine addition is too high; too high salt content also makes microorganisms unable to survive

[0004] With the development of electrolysis technology, the application of electrolysis technology in the treatment of high ammonia nitrogen wastewater has been realized, but it has not been applied to the treatment of power plant desulfurization wastewater. This is due to the characteristics of power plant desulfurization wastewater: wastewater with high scaling tendency It is easy to scale on the surface of the electrode, which affects the continuous operation of electrolysis; the ammonia nitrogen content in power plant desulfurization wastewater is high, and the existing electrolysis process has a low removal rate for ammonia nitrogen, and the treated wastewater cannot meet the discharge standard

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