Ammonia nitrogen wastewater treatment is an important environmental issue in the PCB factory. Due to the alkaline etching process, the ammonia nitrogen wastewater generated in PCB factories accounts for 3%~8% of the total wastewater, and the ammonia nitrogen content is high, generally between (800~1500)mg/L. The traditional treatment process is to discharge the ammonia-nitrogen wastewater directly into a comprehensive wastewater pond, where it is removed by microbial nitrification and denitrification reactions after dilution. However, with the rise of water reuse, a large amount of micro-polluted wastewater is reused in the production line, resulting in a decrease in the dilution capacity of the integrated wastewater pond for ammonia-nitrogen wastewater, and a sharp increase in the ammonia-nitrogen load of the biochemical section, which makes the microbial nitrification and denitrification capacity much lower than the design value. Therefore, the treatment of ammonia-nitrogen wastewater has become difficult in printed circuit board wastewater treatment.
Ammonia Nitrogen Electrolytic Water Treatment System
Release time：24 September 2024Ammonia Nitrogen Electrolytic Water Treatment System
Ammonia Nitrogen Electrolysis Water Treatment System is an efficient and environmentally friendly water treatment method mainly used to remove ammonia and nitrogen compounds, including free ammonia and ammonium ions, from water.
The core principle of the ammonia nitrogen electrolysis water treatment system is to utilize electrochemical catalytic oxidation, which is an advanced oxidation technology to degrade ammonia nitrogen wastewater through the strong oxidizing substances (e.g. -OH, H2O2, ClO-, etc.) produced by the electrolysis process. In the electrolysis process, sewage is used as the electrolyte, and the pollutants in the sewage are used as the electrolytes, which undergo oxidation and reduction reactions at the anode and cathode, respectively, to convert the pollutants into harmless substances, thus realizing sewage purification. The advantages of this method include rapid reaction, simple operation, good controllability, no secondary pollution, etc., so it is getting more and more attention.
Ammonia Nitrogen Electrolytic Water Treatment Process
The ammonia nitrogen electrolysis water treatment process mainly includes the following steps:
- Pre-treatment: First, the high ammonia nitrogen wastewater is pre-treated, including adjusting the pH of the wastewater to alkaline and removing the filtrate slag by filtration to obtain the filtrate for backup. The purpose of this step is to prepare for the subsequent electrolysis treatment.
- Electrolysis to generate sodium hypochlorite: The pre-treated filtrate of industrial high ammonia nitrogen wastewater is put into the electrolysis tank, and the industrial salt is electrolyzed into chlorine gas through electrolysis, which is easily soluble in water to produce hypochlorous acid, which combines with the chlorine ions in the water to generate sodium hypochlorite.
- Electrolysis to remove ammonia nitrogen: The sodium hypochlorite generated in the previous step is used to oxidize the input high ammonia nitrogen wastewater filtrate, thus removing ammonia nitrogen from the high ammonia nitrogen wastewater. This step effectively reduces the ammonia nitrogen content in the wastewater through oxidation.
- Post-treatment: Finally, the wastewater after electrolysis to remove ammonia nitrogen treatment is post-treated to further purify the water quality and meet the discharge standard.
Throughout the treatment process, the ammonia nitrogen in the wastewater is effectively removed by adjusting pH, generating sodium hypochlorite by electrolysis, and removing ammonia nitrogen by electrolysis, to achieve the purpose of purifying water quality. In addition, the method also involves the control of electrolysis reaction conditions, such as current density, electrolysis reaction temperature, etc., to ensure the treatment effect and safety.
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Working Principle and Process
Through chemical reactions under the condition of electric energy, electrochemical oxidation and reduction reactions take place at the anode and cathode respectively. Depending on these chemical reactions, some pollutants that are easily soluble or soluble in sewage can be changed into materials that are difficult to accommodate in solution, so as to achieve the purpose of removing various pollutants.
Advantages of the electrochemical method over the traditional method
- Free radicals generated during the process react with organic pollutants in wastewater directly and selectively to degrade them into carbon dioxide, water, and simple organic matter, with no or little secondary pollution.
- The experiment can be controlled by the two external factors of changing the applied voltage and current at any time, which makes the experiment more controllable. The electron transfer is only carried out between the electrode and the wastewater components, and no additional oxidizing reducing agent is needed to avoid the secondary pollution caused by the addition of additional drugs.
- If the scale of the discharge is not large, it can be realized in situ treatment;
- The reaction conditions are mild, and the electrochemical reaction can be carried out at room temperature under normal conditions.
- It has the function of air floating, disinfection, and flocculation.
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