Reduction of nitrate from groundwater: powder catalysts and catalytic membrane
The reduction of nitrate contaminant in groundwater has gained renewed and intensive attention due to the environmental problems and health risks. Catalytic denetrification presents one of the most promising approaches for the removal of nitrate from water. Catalytic nitrate reduction from water by powder catalysts and catalytic membrane in a batch reactor was studied. And the effects of the initial concentration, the amounts of catalyst, and the flux H2 on the nitrate reduction were also discussed. The results demonstrated that nitrate reduction activity and the selectivity to nitrogen gas were mainly controlled by diffusion limitations and the mass transfer of the reactants. The selectivity can improved while retaining a high catalytic activity under controlled diffusion condition or the intensification of the mass transfer, and a good reaction condition. The total nitrogen removal efficiency reached above 80%. Moreover, catalytic membrane can create a high effective gas/liquid/solid interface, and show a good selectivity to nitrogen in comparative with the powder catalyst, the selectivity to nitrogen was improved from 73.4% to 89.4%.
作 者： CHEN Ying-xu ZHANG Yan LIU Hong-yuan 作者单位： CHEN Ying-xu(Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China)ZHANG Yan(Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China)
LIU Hong-yuan(College of Civil Engineering and Architecture,Zhejiang University of Technology, Hangzhou 310014, China)
刊 名： 环境科学学报(英文版) ISTIC SCI 英文刊名： JOURNAL OF ENVIRONMENTAL SCIENCES 年，卷(期)： 2003 15(5) 分类号： X52 关键词： Pd-Cu catalysts hydrogenation catalytic membrane nitrate ammonium