Performance of a hybrid activated sludge/biofilm process forwastewater treatment in a cold climate region: Influenceof operating conditions

Michele Torregrossa, Daniele Di Trapani, Gaspare Viviani, Michele Torregrossa, Gaspare Viviani, Daniele Di Trapani, Magnus Christensson, Hallvard Ødegaard

Risultato della ricerca: Article

58 Citazioni (Scopus)


The main aim of the study was to investigate a hybrid MBBR process, mostly in terms of organic matterremoval and nitrification, when operating with different values of the mixed liquor sludge retention time(SRT), and highlighting the influence of temperature on the process. Based on experience in practice itwas hypothesized that nitrification could be maintained at far lower SRT’s than in conventional activatedsludge systems and with high organic loading rates applied. A field gathering campaign has been carriedout on a hybrid activated sludge/biofilm. The obtained results highlighted that the pilot plant was capableto remove the organic matter at loading rates up to 3.00 kg TCOD m−3 day−1, also showing very highnitrification activity. Ammonia uptake rate (AUR) batch test showed that biofilm nitrification activityincreased when the mixed liquor SRT decreased. The final suggestion is that it is possible to run a hybridreactor with low mixed liquor SRT values, as well as low temperatures, still having a high ammoniumremoval efficiency, since a large fraction of nitrification activity will take place in the biofilm.
Lingua originaleEnglish
Numero di pagine6
RivistaBiochemical Engineering Journal
Stato di pubblicazionePublished - 2013


All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Bioengineering
  • Biomedical Engineering

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