title: Effect of electro-stimulation on activity of heterotrophic denitrifying bacteria and denitrification performance.
abstract: 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 200mA/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 200-250mA/m(2), although the terminative pH increased to 8.62 at 200mA/m(2) and 9.63 at 250mA/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.
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China.
authors.forename: Hengyuan
authors.initials: H
authors.lastname: Liu
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China; Department of Civil & Environmental Engineering, University of South Florida, 4202 E. Fowler Ave, ENB 118, Tampa, FL 33620, USA.
authors.forename: Shuang
authors.initials: S
authors.lastname: Tong
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Chen
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China. Electronic address: fengcp@cugb.edu.cn.
authors.forename: Chuanping
authors.initials: C
authors.lastname: Feng
authors.affiliation: Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences Beijing), Ministry of Education, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China.
authors.forename: Qili
authors.initials: Q
authors.lastname: Hu
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000641:Ammonia / Q000302:isolation & purification; D001419:Bacteria / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology; D058440:Denitrification; D004558:Electric Stimulation / Q000379:methods*; D004560:Electricity; D055664:Electrochemical Techniques; D052836:Heterotrophic Processes; D006863:Hydrogen-Ion Concentration; D009566:Nitrates / Q000302:isolation & purification; D009573:Nitrites / Q000302:isolation & purification
chemical_list: D009566:Nitrates; D009573:Nitrites; D000641:Ammonia; D000255:Adenosine Triphosphate
keywords: Bacteria activity; Bio-electrochemical process; Denitrification; Electro-stimulation; Groundwater