الفهرس 
Introduction and ObjectivesOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
The aim of this study was to investigate the effect of addition of fixed media on the performance of the conventional activated sludge. A pilot plant of activated sludge reactor was operated for two different methods of treatment. The first method was conventional activated sludge while the second was activated sludge with fixed media. In the conventional activated sludge method at a retention time of 10 hours an efficiency of COD removal up to 90% was attained. In the second method of treatment this efficiency of COD removal can be attained at a retention time of 6 hours. According to the results of the pilot plant it was found that the addition of fixed media can reduce the volume of activated sludge tanks by 46% consequently reduce the cost of the construction by 43% taking into consideration the cost of media. Also the following equation was obtained to design an activated sludge with fixed media system