Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | AEROBIC GRANULATION DURING THE START UP PERIOD OF A PERIODIC BIOFILTER |
| Keywords | Aerobic granulationhydrodynamic shear forceSBBRstart up |
| Year | 2005 |
| Type | Contributo in volume |
| Authors | DI IACONI C., RAMADORI R., LOPEZ A. |
| Text | 138534 2005 Aerobic granulation hydrodynamic shear force SBBR start up AEROBIC GRANULATION DURING THE START UP PERIOD OF A PERIODIC BIOFILTER DI IACONI C., RAMADORI R., LOPEZ A. CNR Istituto di Ricerca sulle Acque The paper reports the results of an experimental investigation specifically aimed at assessing the mechanism of biomass granulation during the start up of a period biofilter under aerobic conditions. The role of the hydrodynamic shear forces, calculated by a methodology developed by authors, was assessed, and a mechanism for granulation was proposed 1 formation of a thin biofilm that completely covers the carrier; 2 increase of biofilm thickness; 3 break up of the attached biofilm with release of biofilm particles; 4 rearrangement of biofilm particles in smooth granules. The hydrodynamic shear forces trend during the start up period provides a key for explaining the process of biomass granulation. In fact, during the first two steps, the biofilter is characterised by rather weak shear force values lower than 1 dyne/cm2 . Under these weak forces, the biofilm grows, increasing its thickness through a porous structure characterized by weak adhesion strengths. The continual increase of biofilm thickness produces a corresponding increase of the shear forces with negative effects on biomass stability that cause the detachment of biofilm particles. In turn, such detachment causes a further sharp increase of the shear forces that promotes the rearrangement of the detached biofilm particles into smooth granules. Aerobic Granular Sludge 1 84339 509 6 Bathe S., de Kreuk M., McSwain B. and Schwarzenbeck N. eds Capitolo Contributo in volume IWA Publishing 1476 1785 Water and environmental management series Water and environmental management series Water environ. manag. ser. Water and environmental management series. WEMS claudio.diiaconi DI IACONI CLAUDIO antonio.lopez LOPEZ ANTONIO roberto.ramadori RAMADORI ROBERTO TA.P07.001.001 Sviluppo di tecnologie depurative a regime non stazionario |