Deep Denitrification of the Simulated Coastal Secondary Effluent with High Chloride Ion by Electrolysis
Yaozong Zhang 1  
,   Bo Pang 1  
,   Guozhu Bo 1  
,   Xinyuan Zhang 1  
,   Wei Zhang 1  
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College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan 063000, PR China
Yaozong Zhang   

North China University of Science and Technology, China
Submission date: 2020-04-24
Final revision date: 2020-08-31
Acceptance date: 2020-09-06
Online publication date: 2021-01-29
In this study, we proposed electrolysis method to remove TN of the simulated coastal secondary effluent with high chloride ion concentration. TN, nitrate-N, ammonia-N nitrite-N were detected to evaluate the evolution of nitrogen. Under the set conditions, Nitrate-N, ammonia-N removal rate and nitrite-N concentration increased with the rising FRC concentration. The higher the initial nitrate-N, the lower the ammonia-N removal rate and the higher nitrite-N accumulation. The nitrate-N concentration was almost not influenced by ammonia-N, and nitrite-N accumulation was greatly influenced by the ammonia-N and nitrate-N. TN removal rate got up to from 87.6% to 50.0% without the influence of COD. COD could greatly influence the removal of ammonia-N but little for the removal of nitrate-N and nitrite-N accumulation. The TN removal rates reached from 68.0% to 57.2% with the influence of COD. All the TN index met the discharge standard no higher than 15 mg/L. The conversion between nitrate-N and ammonia-N did happen and intermediate product nitrite-N could be produced by nitrate-N and ammonia-N. The application of the electrolysis method on the removal of TN in effluent improved the understanding the TN removal mechanism and proposed a promising and reliable method for practical engineering.