title: The effect of iron dosing on reducing waste activated sludge in the oxic-settling-anoxic process.
abstract: This study evaluates the biological solid reduction in a conventional activated sludge system with an anoxic/anaerobic side stream reactor receiving 1/10 of return sludge mass. Influent iron concentrations and feeding modes were changed to explore the consistency between the influent iron concentration and yield values and to assess the impact of feeding pattern. The results indicated that sludge reduction occurs during alternately exposure of sludge to aerobic and anoxic/anaerobic conditions in a range of 38-87%. The sludge reduction values reached a maximum level with the higher iron concentrations. Thus, it is concluded that this configuration is more applicable for plants receiving high iron concentrations in the wastewaters.
authors.affiliation: Faculty of Civil Engineering, Environmental Engineering Department, Istanbul Technical University, 34469 Istanbul, Turkey. Electronic address: yagcin@itu.edu.tr.
authors.forename: Nevin
authors.initials: N
authors.lastname: Yagci
authors.affiliation: Virginia Polytechnic Institute and State University, Department of Civil Engineering, Blacksburg, VA 24061, USA.
authors.forename: John T
authors.initials: JT
authors.lastname: Novak
authors.affiliation: Virginia Polytechnic Institute and State University, Department of Civil Engineering, Blacksburg, VA 24061, USA.
authors.forename: Clifford W
authors.initials: CW
authors.lastname: Randall
authors.affiliation: Faculty of Civil Engineering, Environmental Engineering Department, Istanbul Technical University, 34469 Istanbul, Turkey; ENVIS Energy and Environmental Systems R&D Ltd, ITU Arı Teknokent, Arı-1 Building, 34469 Istanbul, Turkey.
authors.forename: Derin
authors.initials: D
authors.lastname: Orhon
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D019149:Bioreactors; D000860:Hypoxia; D007501:Iron / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D007501:Iron; D010100:Oxygen; D012722:Sewage; D062065:Wastewater
keywords: Feeding regime; Iron content; Observed sludge yield; Oxic-settling-anoxic process; Sludge reduction