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Reactor performance in terms of COD and nitrogen removal and bacterial community structure of a three-stage rotating bioelectrochemical contactor.
Water Res. 2013 Feb 01; 47(2):881-94.WR

Abstract

Integrating microbial fuel cell (MFC) into rotating biological contactor (RBC) creates an opportunity for enhanced removal of COD and nitrogen coupled with energy generation from wastewater. In this study, a three-stage rotating bioelectrochemical contactor (referred to as RBC-MFC unit) integrating MFC with RBC technology was constructed for simultaneous removal of carbonaceous and nitrogenous compounds and electricity generation from a synthetic medium containing acetate and ammonium. The performance of the RBC-MFC unit was compared to a control reactor (referred to as RBC unit) that was operated under the same conditions but without current generation (i.e. open-circuit mode). The effect of hydraulic loading rate (HLR) and COD/N ratio on the performance of the two units was investigated. At low (3.05 gCOD g⁻¹N) and high COD/N ratio (6.64 gCOD g⁻¹N), both units achieved almost similar COD and ammonia-nitrogen removal. However, the RBC-MFC unit achieved significantly higher denitrification and nitrogen removal compared to the RBC unit indicating improved denitrification at the cathode due to current flow. The average voltage under 1000 Ω external resistance ranged between 0.03 and 0.30 V and between 0.02 and 0.21 V for stages 1 and 2 of the RBC-MFC unit. Pyrosequencing analysis of bacterial 16S rRNA gene revealed high bacterial diversity at the anode and cathode of both units. Genera that play a role in nitrification (Nitrospira; Nitrosomonas), denitrification (Comamonas; Thauera) and electricity generation (Geobacter) were identified at the electrodes. Geobacter was only detected on the anode of the RBC-MFC unit. Nitrifiers and denitrifiers were more abundant in the RBC-MFC unit compared to the RBC unit and were largely present on the cathode of both units suggesting that most of the nitrogen removal occurred at the cathode.

Authors+Show Affiliations

Department of Civil and Environmental Engineering, American University of Beirut, Beirut, Lebanon.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23219389

Citation

Sayess, Rassil R., et al. "Reactor Performance in Terms of COD and Nitrogen Removal and Bacterial Community Structure of a Three-stage Rotating Bioelectrochemical Contactor." Water Research, vol. 47, no. 2, 2013, pp. 881-94.
Sayess RR, Saikaly PE, El-Fadel M, et al. Reactor performance in terms of COD and nitrogen removal and bacterial community structure of a three-stage rotating bioelectrochemical contactor. Water Res. 2013;47(2):881-94.
Sayess, R. R., Saikaly, P. E., El-Fadel, M., Li, D., & Semerjian, L. (2013). Reactor performance in terms of COD and nitrogen removal and bacterial community structure of a three-stage rotating bioelectrochemical contactor. Water Research, 47(2), 881-94. https://doi.org/10.1016/j.watres.2012.11.023
Sayess RR, et al. Reactor Performance in Terms of COD and Nitrogen Removal and Bacterial Community Structure of a Three-stage Rotating Bioelectrochemical Contactor. Water Res. 2013 Feb 1;47(2):881-94. PubMed PMID: 23219389.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reactor performance in terms of COD and nitrogen removal and bacterial community structure of a three-stage rotating bioelectrochemical contactor. AU - Sayess,Rassil R, AU - Saikaly,Pascal E, AU - El-Fadel,Mutasem, AU - Li,Dong, AU - Semerjian,Lucy, Y1 - 2012/11/23/ PY - 2012/06/11/received PY - 2012/09/22/revised PY - 2012/11/12/accepted PY - 2012/12/11/entrez PY - 2012/12/12/pubmed PY - 2013/6/21/medline SP - 881 EP - 94 JF - Water research JO - Water Res VL - 47 IS - 2 N2 - Integrating microbial fuel cell (MFC) into rotating biological contactor (RBC) creates an opportunity for enhanced removal of COD and nitrogen coupled with energy generation from wastewater. In this study, a three-stage rotating bioelectrochemical contactor (referred to as RBC-MFC unit) integrating MFC with RBC technology was constructed for simultaneous removal of carbonaceous and nitrogenous compounds and electricity generation from a synthetic medium containing acetate and ammonium. The performance of the RBC-MFC unit was compared to a control reactor (referred to as RBC unit) that was operated under the same conditions but without current generation (i.e. open-circuit mode). The effect of hydraulic loading rate (HLR) and COD/N ratio on the performance of the two units was investigated. At low (3.05 gCOD g⁻¹N) and high COD/N ratio (6.64 gCOD g⁻¹N), both units achieved almost similar COD and ammonia-nitrogen removal. However, the RBC-MFC unit achieved significantly higher denitrification and nitrogen removal compared to the RBC unit indicating improved denitrification at the cathode due to current flow. The average voltage under 1000 Ω external resistance ranged between 0.03 and 0.30 V and between 0.02 and 0.21 V for stages 1 and 2 of the RBC-MFC unit. Pyrosequencing analysis of bacterial 16S rRNA gene revealed high bacterial diversity at the anode and cathode of both units. Genera that play a role in nitrification (Nitrospira; Nitrosomonas), denitrification (Comamonas; Thauera) and electricity generation (Geobacter) were identified at the electrodes. Geobacter was only detected on the anode of the RBC-MFC unit. Nitrifiers and denitrifiers were more abundant in the RBC-MFC unit compared to the RBC unit and were largely present on the cathode of both units suggesting that most of the nitrogen removal occurred at the cathode. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/23219389/Reactor_performance_in_terms_of_COD_and_nitrogen_removal_and_bacterial_community_structure_of_a_three_stage_rotating_bioelectrochemical_contactor_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(12)00835-4 DB - PRIME DP - Unbound Medicine ER -