Ammonia-nitrogen wastewater treatment method and system

Abstract

The invention provides an ammonia nitrogen wastewater treatment method and system. The ammonia-nitrogen wastewater treatment method comprises the following steps: circulating an etching solution in anetching solution tank and an electrolytic tank; carrying out electrolysis operation on the etching solution in the electrolytic tank; carrying out gas extraction operation in the electrolytic tank toobtain chlorine gas; detecting the copper content of the etching solution in the etching solution tank, stopping the electrolysis operation if the concentration of copper ions is 120-130g / l, and adjusting preset components of the etching solution to obtain a PCB etching solution; if the concentration of copper ions is greater than 130g / l, continuing the electrolysis operation; circulating ammonia-nitrogen wastewater in an ammonia-nitrogen wastewater collection tank and an absorption tank; and introducing chlorine into the ammonia-nitrogen wastewater in the absorption tank, and performing ammonia-nitrogen removal operation. According to the ammonia-nitrogen wastewater treatment method, the ammonia-nitrogen wastewater treatment cost is reduced, the ammonia-nitrogen wastewater treatment effect is improved, and ammonia-nitrogen wastewater treatment can be completed only by using equipment with a relatively small volume.

Description

technical field [0001] The invention relates to the technical field of ammonia nitrogen wastewater treatment, in particular to a method and system for treating ammonia nitrogen wastewater. Background technique [0002] The ammonia nitrogen wastewater generated by the alkaline etching of the PCB in the existing PCB manufacturing plant and the ammonia nitrogen wastewater generated by other processes that require the use of ammonia water to adjust the pH are cumbersome and costly to treat. With the increasingly stringent standards for ammonia nitrogen discharge in wastewater, the cost and difficulty of ammonia nitrogen wastewater treatment have gradually increased. Commonly used ammonia nitrogen wastewater treatment methods, such as stripping method, breakpoint chlorine addition and nitrification and denitrification, etc., among them, stripping method The equipment for treating high-concentration ammonia-nitrogen wastewater is simple, and ammonia can be recovered, but it has hi...

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Problems solved by technology

[0002] The ammonia nitrogen wastewater generated by the alkaline etching of the PCB in the existing PCB manufacturing plant and the ammonia nitrogen wastewater generated by other processes that require the use of ammonia water to adjust the pH are cumbersome and costly to treat

With the increasingly stringent standards for ammonia nitrogen discharge in wastewater, the cost and difficulty of ammonia nitrogen wastewater treatment are gradually increasing. Commonly used ammonia nitrogen wastewater treatment methods, such as stripping method, breakpoint chlorine addition and nitrification and denitrification, etc., among them, stripping method The equipment for treating high-concentration ammonia-nitrogen wastewater is simple, and ammonia can be recovered, but it has high environmental requirements, limited stripping efficiency, large material consumption, and high cost; the breakpoint chlorination method can completely remove ammonia nitrogen under certain control in theory , but due to the large amount of chlorine added, high cost, and by-products, this method can only be used for subsequent treatment of wastewater; nitrification and denitrification is the most widely used denitrification method, with mature technology and good denitrification effect. However, the process is long, takes up a lot of land, often requires additional carbon sources, consumes a lot of energy, and costs high

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