EFFECT OF ADVANCED TREATMENT ON AMMONIA NITROGEN CONTAINED IN SECONDARY EFFLUENT FROM WASTEWATER TREATMENT PLANT

作者：Wang, Hao^*; An, Xiaoqing; Zhang, Zhenying

来源：Fresenius Environmental Bulletin, 2018, 27(4): 2043-2050.

• Electrochemical oxidation
• ammonia nitrogen
• energy consumption
• oxidation rate

To investigate the electrochemical degradation of low concentration ammonia nitrogen contained in the secondary effluent from wastewater treatment plant(WWTP), the effect of various operating factors, including initial chloride ion, current density, pH and plate distance, were studied. The results revealed that the higher the initial chloride ion concentration was, the better the ammonia nitrogen removal effect was. When the initial chloride ion concentration was 300 mg/1, the energy consumption was relatively low and current efficiency was relatively high. Meanwhile, removal of ammonia nitrogen increased with the current density improved. In addition, when the current density was 10mA/cm(2) and retention time of 10 min, the ammonia nitrogen concentration was almost reaching to 0 mg/L. By increasing current density continually, current efficiency could be reduced for the surplus electricity would be consumed by the electrolysis of water, because alkalescence condition was conductive to the removal of ammonia, and electrochemical oxidation rate of ammonia reached the maximum value 0.49mg.L-1.min(-1) when the pH was about 10. For plate distance of 2 cm, the removal efficiency was not obviously increased. It was found that the ammonia electro-oxidation course followed first order kinetics.

• 单位
  中国科学技术大学