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Selection of denitrifying phosphorus accumulating organisms in activated sludge

TitoloSelection of denitrifying phosphorus accumulating organisms in activated sludge
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2001
AutoriSpagni, A., Stante Loredana, and Bortone G.
RivistaEnvironmental Technology
Parole chiaveactivated sludge, aerobic reactor, anaerobic metabolism, article, bioaccumulation, Biodegradation, Biomass, Bioreactor, Bioreactors, controlled study, denitrification, Environmental, Inoculation, microorganism, nitrate, Nitrates, Nitrites, Nitrogen, nonhuman, Phosphates, Phosphorus, Quaternary Ammonium Compounds, Sequencing batch reactor, sewage, Water Purification

Although anoxic phosphorus uptake has been demonstrated, the conditions that stimulate or inhibit the anoxic uptake are not fully understood. In this study, the possibility of achieving biological excess phosphorus removal in sequencing batch reactors using nitrate as an electron acceptor without including an aerobic phase has been confirmed. The use of an anaerobic/anoxic/aerobic sequencing batch reactor allows anoxic phosphorus uptake to be achieved, in spite of the low fraction of denitrifying phosphorus accumulating organisms present in the inoculum. Biomass characterisation was carried out to determine the denitrifying fraction of the phosphorus accumulating organisms in sequencing batch reactors operating at different operational conditions. With an anaerobic/anoxic/aerobic cycle, it was demonstrated that the disadvantage of denitrifying phosphorus accumulating organisms due to the lower substrate utilisation efficiency in anoxic conditions relative to aerobic conditions, is not so effective to cause the "strictly aerobic" phosphorus accumulating organisms to dominate in the system.


cited By 6

Citation KeySpagni20011429