Activated sludge samples of nine different membrane bioreactors were studied to
examine their rheological behavior. All sludge samples showed strongly pseudoplastic
behavior. Apparent viscosity increased up to factor 100 with decreasing shear rates. MLSS
concentration was found to be a major parameter influencing apparent viscosity. Based on the
Ostwald equation, an empirical approach for estimating apparent viscosity as a function of
MLSS concentration is given.
Increasing sludge viscosity is one of the limiting factors for economically reasonable MLSS
concentrations in MBR. As an example, the increase in energy consumption with increasing
viscosity is shown for a side-stream MBR, taking into account the cross flow velocity along
the membrane surface and the oxygen mass transfer. Includes 15 references, table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 270 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 9 |
| Published : | 03/05/2003 |
