Elimination of nitrate in secondary effluent of wastewater treatment plants by Fe0 and Pd-Cu/diatomite

Journal of Water Reuse and Desalination

Chen, Yi-Hung¹  Yun, Yupan²  Cheng, Shikun²  Li, Zifu²  Saino, Mayiani²  Zheng, Lei² 

[1] Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan;School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants, International Science and Technology Cooperation Base for Environmental and Energy Technology of MOST, Beijing 100083, China E-mail:

关键词: chemical catalytic reduction;    nitrate removal;    Pd-Cu/diatomite;    wastewater treatment;   

DOI  :  10.2166/wrd.2016.122

学科分类：工程和技术（综合）

来源: IWA Publishing

【 摘 要 】

Because total nitrogen (TN), in which nitrate (NO3–) is dominant in the effluent of most wastewater treatment plants, cannot meet the requirement of Chinese wastewater discharge standard (<15 mg/L), NO3– elimination has attracted considerable attention. In this research, the novel diatomite-supported palladium-copper catalyst (Pd-Cu/diatomite) with zero-valent iron (Fe0) was tried to use for catalytic reduction of nitrate in wastewater. Firstly, specific operational conditions (such as mass ratio of Pd:Cu, catalyst amounts, reaction time and pH of solution) were optimized for nitrate reduction in artificial solution. Secondly, the selected optimal conditions were further employed for nitrate elimination of real effluent of a wastewater treatment plant in Beijing, China. Results showed that 67% of nitrate removal and 62% of N2 selectivity could be obtained under the following conditions: 5 g/L Fe0, 3:1 mass ratio (Pd:Cu), 4 g/L catalyst, 2 h reaction time and pH 4.3. Finally, the mechanism of catalytic nitrate reduction was also proposed.

【 授权许可】

CC BY-NC-ND