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dc.contributor.authorSayess, Rassil R.
dc.contributor.authorSaikaly, Pascal
dc.contributor.authorEl-Fadel, Mutasem E.
dc.contributor.authorLi, Dong
dc.contributor.authorSemerjian, Lucy A.
dc.date.accessioned2015-08-03T10:58:49Z
dc.date.available2015-08-03T10:58:49Z
dc.date.issued2013-02
dc.identifier.citationSayess, 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), 881–894. doi:10.1016/j.watres.2012.11.023
dc.identifier.issn00431354
dc.identifier.pmid23219389
dc.identifier.doi10.1016/j.watres.2012.11.023
dc.identifier.urihttp://hdl.handle.net/10754/562624
dc.description.abstractIntegrating 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. © 2012 Elsevier Ltd.
dc.description.sponsorshipThis research was supported by discretionary investigator funds (P.S.) at King Abdullah University of Science and Technology (KAUST). The material presented is also based in part upon work supported by the University Research Board at the American University of Beirut. Special thanks are extended to Mohammed Alarawi and Shahjahan Ali at the Bioscience Core Laboratory at KAUST.
dc.publisherElsevier BV
dc.subject16S rRNA gene pyrosequencing
dc.subjectDenitrification
dc.subjectMicrobial fuel cell
dc.subjectNitrification
dc.subjectRotating bioelectrochemical contactor
dc.subjectRotating biological contactor
dc.titleReactor performance in terms of COD and nitrogen removal and bacterial community structure of a three-stage rotating bioelectrochemical contactor
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Biotechnology Research Group
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalWater Research
dc.contributor.institutionDepartment of Civil and Environmental Engineering, American University of Beirut, Beirut, Lebanon
kaust.personSaikaly, Pascal
kaust.personLi, Dong
kaust.acknowledged.supportUnitBioscience Core Laboratory


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