Effect of electro-stimulation on activity of heterotrophic denitrifying bacteria and denitrification performance

Hengyuan Liu; Shuang Tong; Nan Chen; Ying Liu; Chuanping Feng; Qili Hu

doi:10.1016/j.biortech.2015.07.076

Effect of electro-stimulation on activity of heterotrophic denitrifying bacteria and denitrification performance

Bioresour Technol. 2015 Nov:196:123-8. doi: 10.1016/j.biortech.2015.07.076. Epub 2015 Jul 26.

Authors

Hengyuan Liu¹, Shuang Tong², Nan Chen¹, Ying Liu¹, Chuanping Feng³, Qili Hu¹

Affiliations

¹ 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.
² 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.
³ 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.

PMID: 26231132
DOI: 10.1016/j.biortech.2015.07.076

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.

Keywords: Bacteria activity; Bio-electrochemical process; Denitrification; Electro-stimulation; Groundwater.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adenosine Triphosphate / metabolism
Ammonia / isolation & purification
Bacteria / metabolism*
Bioreactors / microbiology
Denitrification*
Electric Stimulation / methods*
Electricity
Electrochemical Techniques
Heterotrophic Processes*
Hydrogen-Ion Concentration
Nitrates / isolation & purification
Nitrites / isolation & purification

Substances

Nitrates
Nitrites
Ammonia
Adenosine Triphosphate