title: Modeling the fate of particulate components in aerobic sludge stabilization--performance limitations.
abstract: The study investigated the effect of sludge composition on the limitations of aerobic stabilization. It was designed with the foresight that the stabilization mechanism could only be elucidated if the observed volatile suspended solids reduction were correlated with the fate of particulate components in sludge. Biomass sustained at sludge ages of 2 and 10 days were used in the stabilization reactors. Particulate components were determined by model evaluation of corresponding oxygen uptake rate profiles. Interpretation of the experimental data by modeling, based on death-regeneration mechanism without external substrate, could simulate the fate and evolution of major components in sludge during stabilization. It showed that both microbial decay and hydrolysis of non viable cellular material proceeded at much slower rates as compared with biological systems sustained with substrate feeding. Modeling also indicated that particulate metabolic products generated by sludge acclimated to high sludge age undergo slow biodegradation under prolonged stabilization.
authors.affiliation: Faculty of Civil Engineering, Environmental Engineering Department, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey; Istanbul Metropolitan Municipality, Directorate of Environmental Protection, 34169 Gungoren, Istanbul, Turkey. Electronic address: ozdemirs@itu.edu.tr.
authors.forename: S
authors.initials: S
authors.lastname: Özdemir
authors.affiliation: Faculty of Civil Engineering, Environmental Engineering Department, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey.
authors.forename: E U
authors.initials: EU
authors.lastname: Çokgör
authors.affiliation: Faculty of Civil Engineering, Environmental Engineering Department, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey; Envis Energy and Environmental Systems Research Development Ltd., İ.T.Ü. Arı Teknokent, Arı 1 Building, No. 16, 34469 Maslak, Istanbul, Turkey.
authors.forename: D
authors.initials: D
authors.lastname: Orhon
mesh_terms: D000332:Aerobiosis; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D002138:Calibration; D005591:Chemical Fractionation; D003198:Computer Simulation; D008962:Models, Theoretical; D010100:Oxygen / Q000378:metabolism; D052638:Particulate Matter / Q000032:analysis*; D012722:Sewage / Q000737:chemistry*
chemical_list: D052638:Particulate Matter; D012722:Sewage; D010100:Oxygen
keywords: Aerobic stabilization; Endogenous decay; Modeling; Particulate microbial products; Respirometry