title: An integrated wastewater treatment system using a BAS reactor with biomass attached to tubular supports.
abstract: This paper describes laboratory experiments aimed to develop a new wastewater treatment system as an alternative to a conventional domestic wastewater plant. A modified Biofilm Airlift Suspension reactor (BAS), with biomass attached to tubular supports, is proposed to address low organic loads (typical of domestic sewage) and low residence time (typical of compact reactors technology). Attached and suspended biomasses, coupled to the high dissolved oxygen (DO), allow high removal efficiencies (90% and 56% for COD and N-NH(4)(+) removal respectively) and high effluent quality to be reached. The experimental activity, divided into three parts, demonstrates the good efficiency of the process, and the reduction of the removal kinetics for the high operating pressure used in the technology. The occurrence of simultaneous nitrification-denitrification (SND) was also observed. When compared with the conventional BAS system, the present treatment shows comparable removal efficiencies and higher specific removal rates (80 mg COD/g VSS and 2.60 mg N-NH(4)(+)/g VSS). The experimental results were coupled with the development of a numerical model to aid in designing a full-scale treatment plant in Italy.
authors.affiliation: Department of Civil, Building and Environmental Engineering, Sapienza University of Rome, Via Eudossiana 18, I-00184 Rome, Italy. antonella.luciano@uniroma1.it
authors.forename: Antonella
authors.initials: A
authors.lastname: Luciano
authors.forename: Paolo
authors.initials: P
authors.lastname: Viotti
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Mancini
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Torretta
mesh_terms: D018441:Biofilms; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D058465:Nitrification; D014865:Waste Disposal, Fluid / Q000379:methods*