The supernatant effluent from full scale anaerobic co-digestion of waste activated sludge and organic fraction of municipal solid waste was treated by a demonstration sequencing batch reactor for short-cut nitrogen removal. After the inoculation with conventional municipal activated sludge, the strategy of two-stage start-up allowed us the fast speciation of ammonia oxidizing bacteria (achieved within 20 days), then the achievement of the maximal treatment potential (0.8 kgN m-3 d-1) for nitritation-denitritation. By automatic indirect control of the free ammonia and the free nitrous acid concentrations, the via-nitrite pathway was fully achieved under aerobic conditions (DO of 1.5 mg L-1) and T of 15°C. Under ordinary operation, the specific nitritation rates was 15-20 mgN gMLVSS-1 L-1, while denitrititation rate was 45-50 mgN gMLVSS-1 L-1. In-situ and ex-situ respirometry and gene-based molecular techniques demonstrated the stable presence of a dominant, restricted ammonia oxidizing bacterial population after the first-stage aerobic start-up. We therefore demonstrated that co-digestion and advanced nitrogen removal from anaerobic supernatant may optimize the performances of an integrated municipal treatment plant.

Two-stage start-up of a demonstration SBR treating anaerobic digestate of WAS and OFMSW for short-cut nitrogen removal

FATONE, Francesco;FRISON, Nicola;LAMPIS, Silvia;PAVAN, Paolo;BOLZONELLA, David
2011-01-01

Abstract

The supernatant effluent from full scale anaerobic co-digestion of waste activated sludge and organic fraction of municipal solid waste was treated by a demonstration sequencing batch reactor for short-cut nitrogen removal. After the inoculation with conventional municipal activated sludge, the strategy of two-stage start-up allowed us the fast speciation of ammonia oxidizing bacteria (achieved within 20 days), then the achievement of the maximal treatment potential (0.8 kgN m-3 d-1) for nitritation-denitritation. By automatic indirect control of the free ammonia and the free nitrous acid concentrations, the via-nitrite pathway was fully achieved under aerobic conditions (DO of 1.5 mg L-1) and T of 15°C. Under ordinary operation, the specific nitritation rates was 15-20 mgN gMLVSS-1 L-1, while denitrititation rate was 45-50 mgN gMLVSS-1 L-1. In-situ and ex-situ respirometry and gene-based molecular techniques demonstrated the stable presence of a dominant, restricted ammonia oxidizing bacterial population after the first-stage aerobic start-up. We therefore demonstrated that co-digestion and advanced nitrogen removal from anaerobic supernatant may optimize the performances of an integrated municipal treatment plant.
2011
Short-cut nitrogen bioremoval; anaerobic supernatant; start-up; co-digestion
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/11562/427964
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact