Fate of aerobic granular sludge in the long-term: The role of EPSs on the clogging of granular sludge porosity.
This work aims to investigate the stability of aerobic granular sludge in the long term, focusing on the clogging of the granular sludge porosity exerted by the extracellular polymeric substances (EPSs). The effects of different cycle lengths (short and long-term cycle) on the granular sludge stability were investigated. Results obtained outlined that during the short duration cycle, the formation and breakage of the aerobic granules were continuously observed. During this period, the excess of EPS production contributed to the clogging of the granules porosity, causing their breakage in the long run. During the long-duration cycle, the extended famine period entailed a greater EPSs consumption by bacteria, thus limiting the clogging of the porosity, and allowed obtaining stable aerobic granules. Reported results demonstrated that an excess in EPSs content could be detrimental to the stability of aerobic granular sludge in the long-term.
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128, Palermo, Italy. Electronic address: santofabio.corsino@unipa.it.
Santo Fabio
SF
Corsino
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128, Palermo, Italy.
Marco
M
Capodici
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128, Palermo, Italy.
Michele
M
Torregrossa
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, 90128, Palermo, Italy.
Gaspare
G
Viviani
D000332:Aerobiosis; D001419:Bacteria / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology*; D011108:Polymers; D016062:Porosity; D012722:Sewage / Q000382:microbiology*; D018508:Water Purification / Q000379:methods*
D011108:Polymers; D012722:Sewage
Aerobic granular sludge; Extracellular polymeric substances (EPSs); Feast/famine; Long-term stability; Porosity clogging