title: Effect of extended aeration on the fate of particulate components in sludge stabilization.
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.
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.
authors.forename: G
authors.initials: G
authors.lastname: İnsel
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; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors; D002138:Calibration; D005591:Chemical Fractionation; D003198:Computer Simulation; D007700:Kinetics; D008962:Models, Theoretical; D052638:Particulate Matter / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*
chemical_list: D052638:Particulate Matter; D012722:Sewage
keywords: Aerobic stabilization; Endogenous decay; Extended aeration; Modeling; Particulate metabolic products