title: Development and calibration of bio-kinetic model for surfactant biodegradation with combined respirometric and titrimetric measurements.
abstract: Substrate removal mechanism in aerobic activated sludge processes was lately modeled using the simultaneous storage and growth (SSAG) phenomenon. The SSAG model was further refined with titrimetric components and successfully calibrated using both respirometric and titrimetric measurements for common substrate acetate. However, the improved SSAG model calibration was not verified with other organic substrates. Furthermore, very few studies are available in the literature on surfactant bio-kinetics, which generally use off-line experimental measurements with limited model-based interpretation. Therefore, the aim of this paper is to demonstrate its applicability for surfactant biodegradation using on-line measurements. Batch experiments were conducted using sodium dodecyl sulfate (SDS) as a test surfactant. Model calibration was done successfully for three different SDS concentrations using respirometric, titrimetric and combined respirometric-titrimetric measurement approaches. The parameter estimation results from all three stated combinations were statistically evaluated and found to be very close validating the model.
authors.affiliation: Australian Centre for Sustainable Catchments, University of Southern Queensland (USQ), Qld 4350, Australia. aravintv@usq.edu.au
authors.forename: V
authors.initials: V
authors.lastname: Aravinthan
authors.forename: M A
authors.initials: MA
authors.lastname: Hoque
mesh_terms: D000332:Aerobiosis; D001673:Biodegradation, Environmental; D002138:Calibration; D007700:Kinetics; D008956:Models, Chemical; D010100:Oxygen / Q000032:analysis; D015203:Reproducibility of Results; D012722:Sewage / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000302:isolation & purification*; D013501:Surface-Active Agents / Q000302:isolation & purification*; D017186:Titrimetry / Q000379:methods*
chemical_list: D012722:Sewage; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate; D010100:Oxygen