Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | SEWAGE SLUDGE RHEOLOGYCAL PROPERTIES EVALUATION BY EXTRUSION TEST |
| Abstract | Rheological properties have a great importance in sludge management, as they have been successfully used for predicting performance of several sludge treatment processes. Sewage sludge is a non-Newtonian fluid, because shear stress is not linearly proportional to shear rate or velocity gradient. Among different equations describing non-Newtonian fluids, the Bingham equation seems to better account physical behaviour, i.e. the presence of initial yield stress until deformation occurs. Rotating viscometers are generally used for measuring rheological properties, but they are costly and difficult to operate in the field. Therefore, research has been carried out to try and measure such properties by adopting simple and applicable field procedures. Several sewage sludges at different solids concentrations were tested using an extrusion apparatus (Kasumeter). Values of rheological parameters were estimated and compared to those measured by viscometer. Results showed that yield stresses and apparent viscosity cal be easily evaluated by Kasumeter and their values are well correlated with those by viscometer. For sludge samples of the same type and origin yield stress appeared strictly correlated to solids concentration, being relationships dependent on sludge type, thus evidencing that other physical, chemical and biological characteristics influence sewage sludge rheology. |
| Source | JOUNAL OF RESIDUALS SCIENCE & TECHNOLOGY 2(1), pp. 41–47 |
| Keywords | rheologysewage sludgeextrusion testsKasumeter |
| Journal | JOUNAL OF RESIDUALS SCIENCE & TECHNOLOGY |
| Editor | DEStech Publications, Inc., Lancaster PA, Stati Uniti d'America |
| Year | 2005 |
| Type | Articolo in rivista |
| Authors | LOTITO V., MININNI G. |
| Text | 67735 2005 rheology sewage sludge extrusion tests Kasumeter SEWAGE SLUDGE RHEOLOGYCAL PROPERTIES EVALUATION BY EXTRUSION TEST LOTITO V., MININNI G. IRSA U.O.S. Bari Istituto di ricerca sulle acque Rheological properties have a great importance in sludge management, as they have been successfully used for predicting performance of several sludge treatment processes. Sewage sludge is a non Newtonian fluid, because shear stress is not linearly proportional to shear rate or velocity gradient. Among different equations describing non Newtonian fluids, the Bingham equation seems to better account physical behaviour, i.e. the presence of initial yield stress until deformation occurs. Rotating viscometers are generally used for measuring rheological properties, but they are costly and difficult to operate in the field. Therefore, research has been carried out to try and measure such properties by adopting simple and applicable field procedures. Several sewage sludges at different solids concentrations were tested using an extrusion apparatus Kasumeter . Values of rheological parameters were estimated and compared to those measured by viscometer. Results showed that yield stresses and apparent viscosity cal be easily evaluated by Kasumeter and their values are well correlated with those by viscometer. For sludge samples of the same type and origin yield stress appeared strictly correlated to solids concentration, being relationships dependent on sludge type, thus evidencing that other physical, chemical and biological characteristics influence sewage sludge rheology. 2 1 Sewage sludge rheological properties evaluation by extrusion tests Sewage_sludge_rheological_properties_evaluation_by_extrusion_tests.pdf Articolo in rivista DEStech Publications, Inc. 1544 8053 JOUNAL OF RESIDUALS SCIENCE TECHNOLOGY JOUNAL OF RESIDUALS SCIENCE TECHNOLOGY vincenzo.lotito LOTITO VINCENZO giuseppe.mininni MININNI GIUSEPPE TA.P07.001.003 Processi innovativi per il trattamento e lo smaltimento dei fanghi di depurazione |