6533b850fe1ef96bd12a8325
RESEARCH PRODUCT
Simultaneous nitrogen and organic carbon removal in aerobic granular sludge reactors operated with high dissolved oxygen concentration
Gaetano Di BellaMichele Torregrossasubject
Environmental EngineeringNitrogenchemistry.chemical_elementPilot ProjectsBioengineeringSimultaneous nitrification-denitrificationBioreactorsLong periodOrganic matterWaste Management and DisposalTotal organic carbonchemistry.chemical_classificationSewageSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleRenewable Energy Sustainability and the EnvironmentGranule (cell biology)Environmental engineeringGeneral MedicineNitrogenAerobiosisCarbonOxygenSolubilitychemistryAerobic granular sludge Granule size Nutrient removal Feast-famine SND processEnvironmental chemistryLoading rateParticle sizedescription
Simultaneous nitrification and denitrification (SND) together with organic removal in granules is usually carried out without Dissolved Oxygen (DO) concentration control, at ‘‘low DO’’ (with a DO 7–8 mg/L, during feast and famine conditions respectively). In particular, different strategies of cultivation and several organic and nitrogen loading rate have been applied, in order to eval- uate the efficiencies in SND process without dissolved oxygen control. The results show that, even under conditions of high DO concentration, nitrogen and organic matter can be simultaneously removed, with efficiency >90%. Nevertheless, the biological conditions in the inner layer of the granule may change sig- nificantly between small and big granules, during the feast and famine periods. From point of view of granule stability, it is also interesting that with a particle size greater than 1.5 mm, after the cultivation start-up, the granules are presented stable for a long period (about 100 days) and, despite the variations of operational conditions, the granules breaking was always negligible.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-03-12 |