Abstract
Experimental coupling of wet air oxidation process and aerobic packed-bed biofilm reactor is presented. It has been tested on phenol as a model refractory compound. At 30 MPa and 250 °C, wet air oxidation batch experiments led to a phenol degradation of 97% and a total organic carbon removal of 84%. This total organic carbon was mainly due to acetic acid. To study the interest of coupling processes, wet air oxidation effluent was treated in a biological treatment process. This step was made up of two packed-bed biofilm reactors in series: the first one acclimated to phenol and the second one to acetic acid. After biological treatment, phenol and total organic carbon removal was 99 and 97% respectively. Thanks to parameters from literature, previous studies (kinetic and thermodynamic) and experimental data from this work (hydrodynamic parameters and biomass characteristics), both treatment steps were modelled. This modelling allows the simulation of the coupling process. Experimental results were finally well reproduced by the continuous coupled process model: relative error on phenol removal efficiency was 1 and 5.5% for wet air oxidation process and packed-bed biofilm reactor respectively.
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Abbreviations
- AF :
-
m2
Total biofilm surface area
- BOD:
-
gBOD L−1
Biological oxygen demand
- CO2(d) :
-
mol L−1
Dissolved oxygen concentration in WAO
- CWAO Hdq :
-
mol L−1
Hydroquinone concentration in WAO
- CWAO AcAc :
-
mol L−1
Acetic acid concentration in WAO
- CWAO PhOH :
-
mol L−1
Phenol concentration in WAO
- C0 PhOH :
-
g m−3
Phenol concentration at the packing/biofilm interface
- CB PhOH :
-
g m−3
Phenol concentration in bulk liquid
- CF PhOH :
-
g m−3
Phenol concentration at the biofilm/boundary layer interface
- Cin PhOH :
-
g m−3
Phenol concentration in the influent
- COD:
-
gCOD L−1
Chemical oxygen demand
- DF PhOH :
-
m2 s−1
Phenol diffusion coefficient in biofilm
- DL PhOH :
-
m2 s−1
Phenol diffusion coefficient in water
- dP :
-
m
Packing characteristic size
- jF PhOH :
-
gphenol m−2 s−1
Phenol flux
- k:
-
L mol−1 s−1
Phenol oxidation rate constant
- kPhOH :
-
m s−1
Phenol mass transfer coefficient
- Ki :
-
g m−3
Phenol inhibition constant
- KPhOH :
-
g m−3
Phenol affinity constant
- LL :
-
m
Boundary layer length
- Q:
-
m3 s−1
Phenol flow rate
- R:
-
Ratio of phenol diffusion coefficient in biofilm on phenol diffusion coefficient in water
- r:
-
gCOD-X m−3 s−1
Bacteria growth rate
- rPhOH :
-
gphenol m−3 s−1
Phenol consumption rate
- Re:
-
Reynolds number
- Sc:
-
Schmidt number
- Sh:
-
Sherwood number
- XH :
-
gCOD-X m−3
Biofilm density
- XV :
-
kgVS m−3
Biofilm density used in R calculation
- YX/H :
-
gCOD-X gphenol −1
Heterotrophic biomass yield
- z:
-
m
Distance from packing
- μmax :
-
s−1
Specific growth rate
- νwater :
-
m2 s−1
Water kinematic viscosity
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Minière, M., Boutin, O. & Soric, A. Experimental coupling and modelling of wet air oxidation and packed-bed biofilm reactor as an enhanced phenol removal technology. Environ Sci Pollut Res 24, 7693–7704 (2017). https://doi.org/10.1007/s11356-017-8435-5
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DOI: https://doi.org/10.1007/s11356-017-8435-5