6533b834fe1ef96bd129d8a1
RESEARCH PRODUCT
Nitrous oxide from moving bed based integrated fixed film activated sludge membrane bioreactors
Daniele Di TrapaniVito Armando LaudicinaAlida CosenzaGiorgio ManninaMarco CapodiciHallvard ØDegaardsubject
Environmental EngineeringHydraulic retention timeNitrogen0208 environmental biotechnologySettore AGR/13 - Chimica AgrariaBioreactorNitrous Oxidechemistry.chemical_elementPilot Projects02 engineering and technology010501 environmental sciencesManagement Monitoring Policy and LawMembrane bioreactor01 natural sciencesEmission factorWaste Disposal FluidMBRDenitrifying bacteriachemistry.chemical_compoundBioreactorsBioreactorPilot ProjectEmission factor; IFAS; MBR; Nitrous oxide; UCT; Denitrification; Gases; Nitrogen; Nitrous Oxide; Phosphorus; Pilot Projects; Sewage; Waste Disposal Fluid; Bioreactors; Environmental Engineering; Waste Management and Disposal; Management Monitoring Policy and LawWaste Management and Disposal0105 earth and related environmental sciencesSewageSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleChemistryGasePhosphoruPhosphorusGeneral MedicineNitrous oxideIFASNitrogen020801 environmental engineeringPilot plantActivated sludgeEnvironmental chemistryDenitrificationUCTGasesdescription
Abstract The present paper reports the results of a nitrous oxide (N 2 O) production investigation in a moving bed based integrated fixed film activated sludge (IFAS) membrane bioreactor (MBR) pilot plant designed in accordance with the University of Cape Town layout for biological phosphorous removal. Gaseous and liquid samples were collected in order to measure the gaseous as well as the dissolved concentration of N 2 O. Furthermore, the gas flow rate from each reactor was measured and the gas flux was estimated. The results confirmed that the anoxic reactor represents the main source of nitrous oxide production. A significant production of N 2 O was, however, also found in the anaerobic reactor, thus indicating a probable occurrence of the denitrifying phosphate accumulating organism activity. The highest N 2 O fluxes were emitted from the aerated reactors (3.09 g N 2 O N m −2 h −1 and 9.87 g N 2 O N m −2 h −1 , aerobic and MBR tank, respectively). The emission factor highlighted that only 1% of the total treated nitrogen was emitted from the pilot plant. Furthermore, the measured N 2 O concentrations in the permeate flow were comparable with other reactors. Nitrous oxide mass balances outlined a moderate production also in the MBR reactor despite the low hydraulic retention time. On the other hand, the mass balance showed that in the aerobic reactor a constant consumption of nitrous oxide (up to almost 15 mg N 2 O h −1 ) took place, due to the high amount of stripped gas.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-01 |