title: Calibration of hydrodynamic behavior and biokinetics for TOC removal modeling in biofilm reactors under different hydraulic conditions.
abstract: In this study, total organic carbon (TOC) biodegradation was simulated by GPS-X software in biofilm reactors with carriers of plastic rings and glass beads under different hydraulic conditions. Hydrodynamic model by retention time distribution and biokinetic measurement by in-situ batch test served as two significant parts of model calibration. Experimental results showed that TOC removal efficiency was stable in both media due to the enough height of column, although the actual hydraulic volume changed during the variation of hydraulic condition. Simulated TOC removal efficiencies were close to experimental ones with low theil inequality coefficient values (below 0.15). Compared with glass beads, more TOC was removed in the filter with plastic rings due to the larger actual hydraulic volume and lower half saturation coefficient in spite of its lower maximum specific growth rate of biofilm, which highlighted the importance of calibrating hydrodynamic behavior and biokinetics.
authors.affiliation: Aix Marseille University, Centrale Marseille, CNRS, M2P2 UMR 7340, Europôle de l'Arbois, 13545 Aix en Provence Cedex 4, France.
authors.forename: Ming
authors.initials: M
authors.lastname: Zeng
authors.forename: Audrey
authors.initials: A
authors.lastname: Soric
authors.forename: Nicolas
authors.initials: N
authors.lastname: Roche
mesh_terms: D000332:Aerobiosis; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental; D018441:Biofilms / Q000254:growth & development*; D019149:Bioreactors / Q000382:microbiology*; D002138:Calibration; D002244:Carbon / Q000302:isolation & purification*; D003198:Computer Simulation; D005374:Filtration / Q000295:instrumentation; D052836:Heterotrophic Processes; D057446:Hydrodynamics; D007700:Kinetics; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012984:Software; D014865:Waste Disposal, Fluid / Q000295:instrumentation*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
chemical_list: D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D002244:Carbon
keywords: A; C(t); E(t); E(θ); GF; HRT(actual); Heterotrophic biofilm; Ks; Ks_real; L(f); M(dry); M(media); M(tracer); M(wet); Monod half saturation coefficient (mg_TOC/L_V(void)); Monod kinetic; N; PF; Porous media; Q(t); Retention time distribution; Rv; TIC; V(actual); V(bulk); V(exhange); V(media); V(void); Wastewater treatment; X; Y(yield); actual hydraulic retention time (min); actual hydraulic volume (L); average biofilm thickness (mm); b; biofilm concentration (mg_TOC/L_V(void)); biofilm decay rate (L/day); biofilm yield rate (mg COD/mg COD); density of porous media (g/mL); density of wet biofilm (g/mL); dry mass of biofilm (g); dry mass of porous media (g); half saturation coefficient added by the blank TOC concentration (mg_TOC/L_V(void)); hydraulic volume of exchanged zones (L); maximum specific biofilm growth rate (L/day); maximum specific growth rate of heterotrophic biofilm (L/day); maximum substrate biodegradation rate (mg_TOC/(L_V(void).min)); nominal hydraulic retention time; nominal retention time distribution; number of stirred tanks; proportion of total carbon of dry biofilm (%); retention time distribution (min(−1)); specific surface area of porous media (m(2)/m(3)_V(bulk)); the filter with glass beads; the filter with plastic rings; theil inequality coefficient; total mass of tracer injected (g); total volume of filter bed (L); tracer concentration (g/L); void volume of filter bed (L); volume of porous media (L); water flow rate at the outlet (L/min); wet mass of biofilm (g); ε; θ; μ(max); μ(maxH); ρ; ρ(media)