6533b855fe1ef96bd12affb5

RESEARCH PRODUCT

Nitrous oxide from integrated fixed-film activated sludge membrane bioreactor: Assessing the influence of operational variables

Daniele Di TrapaniMarco CapodiciGiorgio ManninaAlida Cosenza

subject

Environmental EngineeringDenitrificationHydraulic retention timeHRT0208 environmental biotechnologySRTchemistry.chemical_elementUCT-IFAS-MBRBioengineering02 engineering and technology010501 environmental sciencesMembrane bioreactorWaste Disposal Fluid01 natural sciencesBioreactorsBioreactorWaste Management and Disposal0105 earth and related environmental sciencesNitrous oxideSewageSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleRenewable Energy Sustainability and the EnvironmentChemistryEnvironmental engineeringGeneral MedicinePulp and paper industryAnoxic watersNitrogen020801 environmental engineeringActivated sludgeDenitrificationAerationC/N

description

The influence of the main operational variables on N2O emissions from an Integrated Fixed Film Activated Sludge University of Cape Town membrane Bioreactor pilot plant was studied. Nine operational cycles (total duration: 340 days) were investigated by varying the value of the mixed liquor sludge retention time (SRT) (Cycles 1–3), the feeding ratio between carbon and nitrogen (C/N) (Cycles 4–6) and simultaneously the hydraulic retention time (HRT) and the SRT (Cycles 7–9). Results show a huge variability of the N2O concentration in liquid and off-gas samples (ranged from 10−1μg N2O-N L−1to 103μg N2O-N L−1). The maximum N2O concentration (1228 μg N2O-N L−1) in the off-gas samples occurred in the anoxic reactor at the lowest C/N value confirming that unbalanced C/N promotes the N2O emission during denitrification. The aerated reactors (aerobic and MBR) have been the major N2O emitters during all the three Phases.

yearjournalcountryeditionlanguage
2017-07-01Bioresource Technology
https://doi.org/10.1016/j.biortech.2017.09.083