High ammonia-nitrogen wastewater treatment method based on forced throttling and ultrasonic treatment

Abstract

The invention discloses a high ammonia-nitrogen wastewater treatment method based on forced throttling and ultrasonic treatment. The method comprises the steps as follows: 1) pressurized high ammonia-nitrogen wastewater is mixed with gas, and then, the mixture is introduced into a throttling device; 2) ultrasonic waves act on the mixture of high ammonia-nitrogen wastewater and gas in the throttling device; 3) the mixture subjected to throttling and ultrasonic treatment in the throttling device is exhausted out of the throttling device by an exhaust device. By means of the method, the removal rate of ammonia-nitrogen in the high ammonia-nitrogen wastewater can be significantly increased, and meanwhile, scaling of the high ammonia-nitrogen wastewater treatment device can be avoided effectively.

Description

Technical field [0001] The invention relates to the field of high ammonia nitrogen wastewater treatment, in particular to a high ammonia nitrogen wastewater treatment method based on forced throttling and ultrasonic treatment. 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 in environmental protection requirements, the requirements for the ammonia nitrogen content in the discharged wastewater have become more and more stringent. For high ammonia nitrogen wastewater, in order to achieve effective removal of ammonia nitrogen, many experts at home and abroad have conducted various studies on it. The mainstream technologies include: ammonia stripping method, chemical precipitation method, ion exchange method, breakpoint chlorination method, biological Denitrification method, etc. [0003] The a...

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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

Because the stripping method uses the NH in the water at a higher pH value 4 + into free NH 3 , which is good for stripping, but it is easy to cause the waste water with high fouling tendency to foul in the stripping tower, causing blockage of the tray

However, the effect of the ordinary tower blowing is not good. The removal rate of ammonia nitrogen is only 60%, and the ammonia nitrogen wastewater cannot meet the discharge standard at all.

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