Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | INFLUENCE OF SOLID RETENTION TIME ON RHEOLOGY OF MBR SLUDGE |
| Abstract | The rheological characterization is of crucial importance in sludge management both for biomass dewatering and stabilization purposes and for the definition of design parameters for sludge handling operations. The sludge retention time (SRT) has a significant influence on biomass properties in biological wastewater treatment systems and in particular in membrane bioreactors (MBR). The aim of this work is to compare the rheological behaviour of the biomass in a membrane bioreactor operated under different SRT. A bench scale MBR was operated for four years under the same conditions except for the SRT, that ranged from 20 days to complete sludge retention. The rheological properties were measured over time and the apparent viscosity was correlated with the concentration of solid material under equilibrium conditions. The three models most commonly adopted for rheological simulations were evaluated and compared in terms of their parameters. Steady state average values of these parameters were related to the equilibrium biomass concentration (MLSS). The models were tested to select the one better fitting the experimental data in terms of Mean Root Square Error (MRSE). The relationship between the apparent viscosity and the shear rate, as a function of solid concentration, was determined and proposed. |
| Source | Water science and technology 56 (8), pp. 151–159 |
| Keywords | Membrane bioreactors; Rheology; Sludge retention time; Sludge viscosity |
| Journal | Water science and technology |
| Editor | IWA Publishing, London, |
| Year | 2007 |
| Type | Articolo in rivista |
| DOI | 10.2166/wst.2007.715 |
| Authors | GIORDANO C., POLLICE A., LAERA G., SATURNO D., MININNI G. |
| Text | 42200 2007 10.2166/wst.2007.715 ISI Web of Science WOS 000253383200017 Membrane bioreactors; Rheology; Sludge retention time; Sludge viscosity INFLUENCE OF SOLID RETENTION TIME ON RHEOLOGY OF MBR SLUDGE GIORDANO C., POLLICE A., LAERA G., SATURNO D., MININNI G. CNR Istituto di Ricerca Sulle Acque, Viale F. De Blasio 5, 70123 Bari, Italy CNR Istituto di Ricerca Sulle Acque, Via Reno 1, 00198 Roma, Italy The rheological characterization is of crucial importance in sludge management both for biomass dewatering and stabilization purposes and for the definition of design parameters for sludge handling operations. The sludge retention time SRT has a significant influence on biomass properties in biological wastewater treatment systems and in particular in membrane bioreactors MBR . The aim of this work is to compare the rheological behaviour of the biomass in a membrane bioreactor operated under different SRT. A bench scale MBR was operated for four years under the same conditions except for the SRT, that ranged from 20 days to complete sludge retention. The rheological properties were measured over time and the apparent viscosity was correlated with the concentration of solid material under equilibrium conditions. The three models most commonly adopted for rheological simulations were evaluated and compared in terms of their parameters. Steady state average values of these parameters were related to the equilibrium biomass concentration MLSS . The models were tested to select the one better fitting the experimental data in terms of Mean Root Square Error MRSE . The relationship between the apparent viscosity and the shear rate, as a function of solid concentration, was determined and proposed. 56 http //www.iwaponline.com/wst/05608/wst056080151.htm Articolo pubblicato 2007_WatSciTech_56_8_151_159.pdf Articolo in rivista IWA Publishing 0273 1223 Water science and technology Water science and technology Water science and technology. Water sci. technol. alfieri.pollice POLLICE ALFIERI giuseppe.laera LAERA GIUSEPPE giuseppe.mininni MININNI GIUSEPPE TA.P07.001.003 Processi innovativi per il trattamento e lo smaltimento dei fanghi di depurazione TA.P07.002.004 Processi biotecnologici e processi a membrana |