Journal
BIORESOURCE TECHNOLOGY
Volume 196, Issue -, Pages 123-128Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.07.076
Keywords
Denitrification; Bio-electrochemical process; Bacteria activity; Groundwater; Electro-stimulation
Funding
- National Natural Science Foundation of China (NSFC) [21407129]
- Research Fund for the Doctoral Program of Higher Education of China [20120022120005]
- Fundamental Research Funds for the Central Universities [2652015238]
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The effects of electro-stimulation on heterotrophic denitrifying bacterial activity and nitrate removal were investigated using a bench-scale bio-electrochemical reactor in this study. Results showed that the maximum nitrate removal efficiency was 100% at the optimum current density of 200 mA/m(2), at which low nitrite production and high ATP aggregate level were obtained. The activity of denitrifying bacteria was highest at the range densities of 200-250 mA/m(2), although the terminative pH increased to 8.62 at 200 mA/m(2) and 9.63 at 250 mA/m(2). This demonstrates that suitable current densities could improve the activity of denitrifying bacteria. Therefore, this study provides a number of useful information to improve the bio-electrochemical reactor designs and promote the removal efficiency of pollutants. (C) 2015 Elsevier Ltd. All rights reserved.
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