The excess biomass produced during biological treatment of municipal wastewater represents a major issue worldwide, as its disposal implies environmental, economic and social impacts. Therefore, there has been a growing interest in developing technologies to reduce sludge production. The main proposed strategies can be categorized according to the place inside the wastewater treatment plant (WWTP) where the reduction takes place. In particular, sludge minimization can be achieved in the wastewater line as well as in the sludge line. This paper presents the results of two pilot scale systems, to evaluate their feasibility for sludge reduction and to understand their effect on biomass activity: (1) a pilot plant with an ozone contactor in the return activated sludge (RAS) stream for the exposition of sludge to a low ozone dosage; and (2) an oxicsettling- anaerobic (OSA) process with high retention time in the anaerobic sludge holding tank have been studied. The results showed that both technologies enabled significant excess sludge reduction but produced a slight decrease of biomass respiratory activity.

Torregrossa, M., Di Bella, G., Di Trapani, D. (2012). Comparison between ozonation and the OSA process: analysis of excess sludge reduction and biomass activity in two different pilot plants. WATER SCIENCE AND TECHNOLOGY, 66, 185-192 [10.2166/wst.2012.153].

Comparison between ozonation and the OSA process: analysis of excess sludge reduction and biomass activity in two different pilot plants

TORREGROSSA, Michele;DI TRAPANI, Daniele
2012-01-01

Abstract

The excess biomass produced during biological treatment of municipal wastewater represents a major issue worldwide, as its disposal implies environmental, economic and social impacts. Therefore, there has been a growing interest in developing technologies to reduce sludge production. The main proposed strategies can be categorized according to the place inside the wastewater treatment plant (WWTP) where the reduction takes place. In particular, sludge minimization can be achieved in the wastewater line as well as in the sludge line. This paper presents the results of two pilot scale systems, to evaluate their feasibility for sludge reduction and to understand their effect on biomass activity: (1) a pilot plant with an ozone contactor in the return activated sludge (RAS) stream for the exposition of sludge to a low ozone dosage; and (2) an oxicsettling- anaerobic (OSA) process with high retention time in the anaerobic sludge holding tank have been studied. The results showed that both technologies enabled significant excess sludge reduction but produced a slight decrease of biomass respiratory activity.
Settore ICAR/03 - Ingegneria Sanitaria-Ambientale
Torregrossa, M., Di Bella, G., Di Trapani, D. (2012). Comparison between ozonation and the OSA process: analysis of excess sludge reduction and biomass activity in two different pilot plants. WATER SCIENCE AND TECHNOLOGY, 66, 185-192 [10.2166/wst.2012.153].
File in questo prodotto:
File Dimensione Formato  
Torregrossa et al_Authors copy.pdf

Solo gestori archvio

Descrizione: Articolo principale
Dimensione 409.31 kB
Formato Adobe PDF
409.31 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

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/10447/65988
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 28
social impact