Nitrification wastewater treatment - electrodialysis technology

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The composition of nitrification wastewater is complex, the content of organic matter is high and difficult to degrade, mainly containing ammonium sulfate, a small amount of ammonium nitrate and unknown substances. At present, the enterprise adopts two-effect evaporation and desalting treatment, and the mother liquor is processed by a rake dryer after steaming. However, there are many problems in this process: large amount of foam reduces evaporation and affects biochemical treatment; The heating tube is easily blocked and needs to be cleaned regularly. Coking carbonization produces tar-like substances; The evaporation of mother liquor leads to the deterioration of salt quality and the difficulty of crystallization, so the system needs to be emptied regularly. The increase of boiling point decreases the evaporation efficiency. The amount of mother liquor is large, the treatment is difficult and the risk is high.

In view of the complex composition and high organic content of nitrification wastewater, electrodialysis is an effective solution. Electrodialysis technology can effectively remove inorganic salt and some organic matter in wastewater by using the principle of ion directional migration under the action of electric field through the selective permeability of ion exchange membrane, so as to achieve the purification and desalination of wastewater.

Compared with traditional wastewater treatment methods, electrodialysis technology has significant advantages in nitrification wastewater treatment. First of all, the electrodialysis process does not need to add chemical agents, avoiding the generation of secondary pollution. Secondly, electrodialysis is easy to operate, stable operation, and can continuously treat a large amount of wastewater. In addition, electrodialysis technology can efficiently remove salt and organic matter in wastewater, and improve the efficiency and quality of wastewater treatment.

However, some problems need to be paid attention to when using electrodialysis technology to treat nitrifying wastewater. First of all, it is necessary to select the appropriate ion exchange membrane and operating conditions according to the specific composition and concentration of the wastewater to ensure the optimal treatment effect. Secondly, due to the polarization scaling and neutral disturbance that may occur in the electrodialysis process, regular maintenance and cleaning of the equipment are needed to ensure the normal operation of the equipment and extend the service life.

To sum up, electrodialysis technology has potential application value in nitrification wastewater treatment. By optimizing operating conditions and equipment maintenance, the treatment effect and economy of electrodialysis technology can be further improved, and an effective solution for nitrification wastewater treatment can be provided.

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