Influence of hydrodynamics on fouling velocity in a recirculated MBR for wastewater treatment
| Autor: | Alain Grasmick, E Tardieu, V Geaugey, J Manem |
|---|---|
| Přispěvatelé: | Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM) |
| Rok vydání: | 1999 |
| Předmět: |
Thermodynamics
Filtration and Separation 02 engineering and technology 010501 environmental sciences Membrane bioreactor 01 natural sciences Biochemistry law.invention 020401 chemical engineering law Mass transfer [CHIM]Chemical Sciences General Materials Science 0204 chemical engineering Physical and Theoretical Chemistry ComputingMilieux_MISCELLANEOUS Filtration 0105 earth and related environmental sciences Chromatography Membrane reactor Fouling Chemistry Membrane fouling Permeation 6. Clean water Membrane |
| Zdroj: | Journal of Membrane Science Journal of Membrane Science, Elsevier, 1999, 156 (1), pp.131-140. ⟨10.1016/S0376-7388(98)00343-3⟩ |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/s0376-7388(98)00343-3 |
| Popis: | Membrane fouling within membrane bioreactor (MBR) applied to wastewater treatment was studied under adequate recirculation conditions, for which fouling was only caused by soluble and colloidal fractions of the biological suspension. Four different activated sludges under steady-state biological conditions were tested under a wide range of hydrodynamic conditions (U=2–5 m/s; Re=3000–20 000; J=40–250 l/h m2). With constant filtration conditions, the increase in hydraulic resistance with time (dR/dt) was measured as the “fouling velocity”, and this varied according to hydrodynamic and biological conditions. Two different models were established to describe this influence, in the form of ln ∂R ∂t =p−q χ . The first model, with the hydrodynamic parameter χ=Re0.8τ0/ρJ2, was based on an energy comparison between the shear forces, represented by τ0, and the kinetic energy linked to the permeation flux described by ρJ2. The second one, with χ=Re 1.3 /J d h , was based on a description of the mass transfer around the membrane, using equations based on adimensional parameters. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect