title: Micropollutant removal by attached and suspended growth in a hybrid biofilm-activated sludge process.
abstract: Removal of organic micropollutants in a hybrid biofilm-activated sludge process was investigated through batch experiments, modeling, and full-scale measurements. Batch experiments with carriers and activated sludge from the same full-scale reactor were performed to assess the micropollutant removal rates of the carrier biofilm under oxic conditions and the sludge under oxic and anoxic conditions. Clear differences in the micropollutant removal kinetics of the attached and suspended growth were demonstrated, often with considerably higher removal rates for the biofilm compared to the sludge. For several micropollutants, the removal rates were also affected by the redox conditions, i.e. oxic and anoxic. Removal rates obtained from the batch experiments were used to model the micropollutant removal in the full-scale process. The results from the model and plant measurements showed that the removal efficiency of the process can be predicted with acceptable accuracy (± 25%) for most of the modeled micropollutants. Furthermore, the model estimations indicate that the attached growth in hybrid biofilm-activated sludge processes can contribute significantly to the removal of individual compounds, such as diclofenac.
authors.affiliation: Water and Environmental Engineering, Department of Chemical Engineering, Lund University, SE-221 00 Lund, Sweden. per.falas@eawag.ch
authors.forename: P
authors.initials: P
authors.lastname: Falås
authors.forename: P
authors.initials: P
authors.lastname: Longrée
authors.forename: J
authors.initials: J
authors.lastname: la Cour Jansen
authors.forename: H
authors.initials: H
authors.lastname: Siegrist
authors.forename: J
authors.initials: J
authors.lastname: Hollender
authors.forename: A
authors.initials: A
authors.lastname: Joss
mesh_terms: D061249:Batch Cell Culture Techniques; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors / Q000382:microbiology; D007700:Kinetics; D008962:Models, Theoretical; D012722:Sewage / Q000382:microbiology*; D062065:Wastewater / Q000382:microbiology; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Activated sludge; Biodegradation; Biofilm carriers; Organic micropollutants; Pharmaceuticals; Redox conditions