Most of nitrogen emissions can be ascribed to agro-industrial activities. Since digestate produced by fermentation of agro-industrial residues can be difficult to dispose of due to its high ammonium content, advanced technical- and cost-effective technologies must be developed and applied in order to significantly reduce its impact on the environment. In this study, aerobic granules were successfully cultivated in a granular sludge sequencing batch reactor (GSBR) fed with the ammonium-rich (approx. 2500 mg L−1) effluent of a 3-stage anaerobic digester treating agro-industrial residues. The peculiar characteristics of such wastewater required a 2-step operating strategy aimed at the selection of nitrifying biomass (Step 1) and the formation of aerobic granular sludge (Step 2). During Step 1, nitrifying biomass selection was achieved by properly regulating the cycle length: (Formula presented.) removal rates progressively increased from 42 to 109 mgN L−1d−1, and a corresponding increase in (Formula presented.) specific removal rates from 8 to 24 mgN gVSS−1d−1 was also observed. During Step 2, the increase in selective pressures (i.e. minimum settling velocity and volumetric organic loading rate) led to the formation of compact (average diameter, 1.02 ± 0.43 mm) and well-settling granules (SVI5, 28.6 ± 3.8 mL gTSS−1), which were able to remove up to 89 ± 2% of organic matter (as COD), 79 ± 3% of (Formula presented.) and 59 ± 4% of nitrogen (as a sum of (Formula presented.), (Formula presented.) and (Formula presented.)). The 2-step operating strategy played a key role in biomass selection and subsequent granule formation and maintenance in the GSBR, and may be successfully adopted for the treatment of different ammonium-rich wastewaters.

Aerobic granular sludge formation in a sequencing batch reactor treating agro-industrial digestate

Carucci A.
;
Cappai G.;Erby G.;
2021-01-01

Abstract

Most of nitrogen emissions can be ascribed to agro-industrial activities. Since digestate produced by fermentation of agro-industrial residues can be difficult to dispose of due to its high ammonium content, advanced technical- and cost-effective technologies must be developed and applied in order to significantly reduce its impact on the environment. In this study, aerobic granules were successfully cultivated in a granular sludge sequencing batch reactor (GSBR) fed with the ammonium-rich (approx. 2500 mg L−1) effluent of a 3-stage anaerobic digester treating agro-industrial residues. The peculiar characteristics of such wastewater required a 2-step operating strategy aimed at the selection of nitrifying biomass (Step 1) and the formation of aerobic granular sludge (Step 2). During Step 1, nitrifying biomass selection was achieved by properly regulating the cycle length: (Formula presented.) removal rates progressively increased from 42 to 109 mgN L−1d−1, and a corresponding increase in (Formula presented.) specific removal rates from 8 to 24 mgN gVSS−1d−1 was also observed. During Step 2, the increase in selective pressures (i.e. minimum settling velocity and volumetric organic loading rate) led to the formation of compact (average diameter, 1.02 ± 0.43 mm) and well-settling granules (SVI5, 28.6 ± 3.8 mL gTSS−1), which were able to remove up to 89 ± 2% of organic matter (as COD), 79 ± 3% of (Formula presented.) and 59 ± 4% of nitrogen (as a sum of (Formula presented.), (Formula presented.) and (Formula presented.)). The 2-step operating strategy played a key role in biomass selection and subsequent granule formation and maintenance in the GSBR, and may be successfully adopted for the treatment of different ammonium-rich wastewaters.
2021
Aerobic granules; agro-industrial wastewater; ammonium; granulation; nitrification
File in questo prodotto:
File Dimensione Formato  
Aerobic granular sludge formation in a sequencing batch reactor treating agro industrial digestate.pdf

Solo gestori archivio

Descrizione: articolo online
Tipologia: versione editoriale
Dimensione 1.46 MB
Formato Adobe PDF
1.46 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Carucci et al 2020 post print.pdf

Open Access dal 03/06/2021

Descrizione: Versione Post print
Tipologia: versione post-print
Dimensione 968.6 kB
Formato Adobe PDF
968.6 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/293077
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 2
social impact