Effect of denitrifying bacteria on the electrochemical reaction of activated carbon fiber in electrochemical biofilm system |
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Authors: | Ying Diwen Jia Jinping and Zhang Lehua |
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Institution: | (1) School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China |
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Abstract: | An electrochemical-activated denitrifying biofilm system consisting of activated carbon fiber electrodes immobilized with
denitrifying bacteria film as cathode was studied. A revised model for an electrochemical-activated denitrifying biofilm was
developed and validated by electrochemical analysis of cathodal polarization curves and nitrate consumption rate. The cathodal
polarization curve and nitrate consumption rate were introduced to verify the rate of electrochemical reaction and the activity
of denitrifying bacteria, respectively. It was shown that the denitrification process effectively strengthened the electrochemical
reaction while the electron also intensified denitrification activity. Electron was transferred between electrochemical process
and biological process not only by hydrogen molecule but also by new produced active hydrogen atom. Additionally, a parameter
of apparent exchange current density was deprived from the cathodal polarization curve with high overpotential, and a new
bio-effect current density was defined through statistical analysis, which was linearly dependent to the activity of denitrification
bacteria. Activated carbon fiber (ACF) electrode was also found to be more suitable to the electrochemical denitrifying system
compared with graphite and platinum.
Translated from Environmental Pollution & Control, 2005, 27(7): 501–504 译自: 环境污染与防治] |
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Keywords: | biofilm denitrification electrochemistry cathodal polarization |
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