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Decomposition of Ammonia Nitrogen from Biologically Pretreated Coking Wastewater with Electrochemical Three-Dimensional Ti/RuO2/IrO2 Electrodes


Affiliations
1 College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, China
2 Tangshan City Drainage Co., Ltd., Tangshan, 063001, China
 

In this research, the electrochemical oxidation with a three-dimensional electrode system, with coke serving as packed bed particle electrodes, was applied for the removal of ammonia nitrogen in biologically pretreated coking wastewater. Surface characteristics of the anode plate and the coke were analysed. The results showed that there had been few cracks on the coating surface of anode and the coating layer had been compact before electrolysis, while the coating surface became relatively rough after electrolysis and small cracks appeared on anode surface. Meanwhile, the surface of prepared coke was porous at the beginning, which enabled it to have adsorption effect, while after electrolysis, the surface of the used coke became dense, which made it function better as packed bed electrodes. In addition, operating variables of retention time, plate spacing, area/volume, current density, pH and chloride concentration were investigated respectively to check their influence on ammonia nitrogen removal. Meanwhile, the results showed that the electrochemical three-dimensional Ti/RuO2/IrO2 electrodes could remove ammonia nitrogen efficiently, and when plate distance was 1.0cm, retention time was 40min and current density was 4.5mA/cm2, the highest ammonia nitrogen removal rate of about 95% was achieved, which was much higher than the removal rate of the system when Ti/RuO2/IrO2 electrodes were used in single under the same condition.

Keywords

Coking Wastewater, Ti/RuO2/IrO2 Electrodes, Ammonia Nitrogen, Electrochemical Oxidation.
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  • Decomposition of Ammonia Nitrogen from Biologically Pretreated Coking Wastewater with Electrochemical Three-Dimensional Ti/RuO2/IrO2 Electrodes

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Authors

Hao Wang
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, China
Yang Yang
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, China
Xiao Liu
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, China
Huiyuan Zhong
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, China
Guozhu Bo
College of Civil and Architecture Engineering, North China University of Science and Technology, Tangshan, 063009, China
Yaozong Zhang
Tangshan City Drainage Co., Ltd., Tangshan, 063001, China

Abstract


In this research, the electrochemical oxidation with a three-dimensional electrode system, with coke serving as packed bed particle electrodes, was applied for the removal of ammonia nitrogen in biologically pretreated coking wastewater. Surface characteristics of the anode plate and the coke were analysed. The results showed that there had been few cracks on the coating surface of anode and the coating layer had been compact before electrolysis, while the coating surface became relatively rough after electrolysis and small cracks appeared on anode surface. Meanwhile, the surface of prepared coke was porous at the beginning, which enabled it to have adsorption effect, while after electrolysis, the surface of the used coke became dense, which made it function better as packed bed electrodes. In addition, operating variables of retention time, plate spacing, area/volume, current density, pH and chloride concentration were investigated respectively to check their influence on ammonia nitrogen removal. Meanwhile, the results showed that the electrochemical three-dimensional Ti/RuO2/IrO2 electrodes could remove ammonia nitrogen efficiently, and when plate distance was 1.0cm, retention time was 40min and current density was 4.5mA/cm2, the highest ammonia nitrogen removal rate of about 95% was achieved, which was much higher than the removal rate of the system when Ti/RuO2/IrO2 electrodes were used in single under the same condition.

Keywords


Coking Wastewater, Ti/RuO2/IrO2 Electrodes, Ammonia Nitrogen, Electrochemical Oxidation.

References