Electrodialysis

Most of the existing wastewater treatment plants rely on microbiological processes. Total Ammonium Nitrogen (TAN) discharge from a biologically based treatment generally indicates that the polish should not be biological. Biological treatment suffers from several inherent drawbacks, such as partial process failure due to toxic shocks and/or low temperatures that adversely affect the (nitrifying) bacteria.

To answer the problems associated with biological systems, we have developed a suitable physico-chemical process.

The system uses electricity to decompose ammonium into its constituents by electrochemical reactions. The Ion exchange lines are used to separate the ammonia from the plant effluent for the electrochemical treatment. After regeneration, the regeneration solution with the separated ammonia is passed to the electrolytic sub-system where ammonia is decomposed and removed.

Electrodialysis has been shown to be an effective means of degrading non-biodegradable pollutants such as ammonium ions from wastewater without the use of consumable chemicals and adding other substances to treat water. In recent years, an electrodialysis has been adopted in separation for residual constituents since more cost-effective to eliminate color and has a high removal efficiency within a short duration of the process.

The system is expected to satisfy the following criteria:

  • Reduce ammonia to below 5 mg/L independently of input concentration;
  • Be simple, stable, reliable, flexible, easy to maintain and control; 
  • Support immediate start-up and shutdown operations; 
  • Inherently modular and can be easily expanded

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