Abstract
The study investigated the effect of extended aeration on the fate of particulate components of biological sludge in aerobic stabilization. Biological sludge was generated in a fill and draw reactor fed with domestic sewage and sustained at steady state, at a sludge age of 20. days. Particulate fractions of sludge were determined by model evaluation of the corresponding oxygen uptake rate profile. Extended aeration could not produce a mineralized biomass. External aerobic stabilization of the thickened sludge achieved a volatile suspended solids reduction of 68% after 60. days. High reduction could be attributed to the relatively higher rate for the hydrolysis of accumulated particulate metabolic products, compared to conventional activated sludge. Model evaluation based on death-regeneration mechanism indicated a gradually decreasing decay rate for solids; the first phase could be associated with the inactivation/death of the viable biomass and the second controlled by the slower breakdown of particulate metabolic products.
| Original language | English |
|---|---|
| Pages (from-to) | 88-94 |
| Number of pages | 7 |
| Journal | Bioresource Technology |
| Volume | 174 |
| DOIs | |
| Publication status | Published - 1 Dec 2014 |
Bibliographical note
Publisher Copyright:© 2014 Elsevier Ltd.
Funding
This study was conducted as a part of the doctorate thesis and a project “Characterization and Modelling of Aerobic Sludge Stabilization” and supported Scientific Research Fund of Istanbul Technical University .
| Funders | Funder number |
|---|---|
| Istanbul Teknik Üniversitesi |
Keywords
- Aerobic stabilization
- Endogenous decay
- Extended aeration
- Modeling
- Particulate metabolic products
