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RESEARCH PRODUCT
The influence of solid retention time on IFAS-MBR systems: Assessment of nitrous oxide emission
Vito Armando LaudicinaDaniele Di TrapaniAlida CosenzaMarco CapodiciGiorgio Manninasubject
Environmental EngineeringNitrogenIFAS-MBR0208 environmental biotechnologyActivated sludge; Biofilm; Emission factor; IFAS-MBR; Nitrous oxide; UCT; Environmental Engineering; Waste Management and Disposal; Management Monitoring Policy and LawSettore AGR/13 - Chimica AgrariaNitrous Oxidechemistry.chemical_element02 engineering and technology010501 environmental sciencesManagement Monitoring Policy and LawMembrane bioreactorEmission factor01 natural scienceschemistry.chemical_compoundBioreactorsWaste Management and Disposal0105 earth and related environmental sciencesSewageSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleBiofilmEnvironmental engineeringGeneral MedicineNitrous oxidePulp and paper industryNitrogenAnoxic waters020801 environmental engineeringActivated sludgePilot plantWater bodychemistryActivated sludgeBiofilmsUCTRetention timedescription
The aim of the present study was to investigate the nitrous oxide (N2O) emissions from a moving bed based Integrated Fixed Film Activated Sludge (IFAS) - membrane bioreactor (MBR) pilot plant, designed according to the University of Cape Town (UCT) layout. The experimental campaign had a duration of 110 days and was characterized by three different sludge retention time (SRT) values (â, 30 d and 15 d). Results highlighted that N2O concentrations decreased when the biofilm concentrations increased within the aerobic reactor. Results have shown an increase of N2O with the decrease of SRT. Specifically, an increase of N2O-N emission factor occurred with the decrease of the SRT (0.13%, 0.21% and 0.76% of influent nitrogen for SRT = â, SRT = 30 d and SRT = 15 d, respectively). Moreover, the MBR tank resulted the key emission source (up to 70% of the total N2O emission during SRT = â period) whereas the highest N2O production occurred in the anoxic reactor. Moreover, N2O concentrations measured in the permeate flow were not negligible, thus highlighting its potential detrimental contribution for the receiving water body. The role of each plant reactor as N2O-N producer/consumer varies with the SRT variation, indeed the aerobic reactor was a N2O consumer at SRT = â and a producer at SRT = 30 d.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-01 |