Inhibition kinetic of overall substrate and phenolics removals during the anaerobic digestion of two-phase olive mill effluents (TPOME) in suspended and immobilized cell reactors
Inhibition kinetic of overall substrate and phenolics removals during the anaerobic digestion of two-phase olive mill effluents (TPOME) in suspended and immobilized cell reactors
A study of the mesophilic anaerobic digestion of two-phase olive mill effluents (TPOME) was carried out at laboratory scale. The digestion was conducted in two continuously stirred tank reactors, one with biomass immobilized on bentonite (reactor B) and the other with suspended biomass used as control (reactor C). The reactors operated satisfactorily between hydraulic retention times (HRT) of 25 and 5 days, respectively. Soluble chemical oxygen demand (SCOD) efficiencies in the ranges of 96–80 and 93–82% were achieved in the reactors with immobilized and suspended biomass, respectively, at organic loading rates of between 0.9–4.8 and 0.9–3.8 g COD/l day, respectively. Anaerobic degradation occurred under inhibitory conditions. The overall substrate removal rate (g SCOD/l day) correlated with the biodegradable substrate concentration through the Andrews kinetic model, from which the maximum substrate removal rate (k), saturation constant (Ks) and constant of inhibition (Ki) were calculated. Although no significant differences between the k and Ks values of the reactors with immobilized and suspended biomass were observed, the Ki value was 2.5-times higher in the first case, indicating that the reactor with immobilized biomass had a better response to inhibitory conditions, probably due to the increase of the sludge age. This proposed model predicted the behavior of both reactors very accurately showing deviations lower than 5% between the experimental and theoretical values of substrate removal rates. The same kinetic model allowed the anaerobic degradation of phenolic compounds to be studied, obtaining the corresponding kinetic constants
425-436
Raposo, F.
47104451-511a-4b03-aaa9-67348da4567d
Borja, R.
ed513484-04ff-4424-ab79-dc715ca63146
Sanchez, E.
8c460625-8a86-4050-baf5-c0d018fcd770
Martin Santos, M. A.
5a0afb50-e598-4567-a233-6f8d00b8b4fd
Martin, F.
8e7fa072-371c-409e-8554-e277f1768a89
29 December 2003
Raposo, F.
47104451-511a-4b03-aaa9-67348da4567d
Borja, R.
ed513484-04ff-4424-ab79-dc715ca63146
Sanchez, E.
8c460625-8a86-4050-baf5-c0d018fcd770
Martin Santos, M. A.
5a0afb50-e598-4567-a233-6f8d00b8b4fd
Martin, F.
8e7fa072-371c-409e-8554-e277f1768a89
Raposo, F., Borja, R., Sanchez, E., Martin Santos, M. A. and Martin, F.
(2003)
Inhibition kinetic of overall substrate and phenolics removals during the anaerobic digestion of two-phase olive mill effluents (TPOME) in suspended and immobilized cell reactors.
Process Biochemistry, 39 (11), .
(doi:10.1016/S0032-9592(03)00095-5).
Abstract
A study of the mesophilic anaerobic digestion of two-phase olive mill effluents (TPOME) was carried out at laboratory scale. The digestion was conducted in two continuously stirred tank reactors, one with biomass immobilized on bentonite (reactor B) and the other with suspended biomass used as control (reactor C). The reactors operated satisfactorily between hydraulic retention times (HRT) of 25 and 5 days, respectively. Soluble chemical oxygen demand (SCOD) efficiencies in the ranges of 96–80 and 93–82% were achieved in the reactors with immobilized and suspended biomass, respectively, at organic loading rates of between 0.9–4.8 and 0.9–3.8 g COD/l day, respectively. Anaerobic degradation occurred under inhibitory conditions. The overall substrate removal rate (g SCOD/l day) correlated with the biodegradable substrate concentration through the Andrews kinetic model, from which the maximum substrate removal rate (k), saturation constant (Ks) and constant of inhibition (Ki) were calculated. Although no significant differences between the k and Ks values of the reactors with immobilized and suspended biomass were observed, the Ki value was 2.5-times higher in the first case, indicating that the reactor with immobilized biomass had a better response to inhibitory conditions, probably due to the increase of the sludge age. This proposed model predicted the behavior of both reactors very accurately showing deviations lower than 5% between the experimental and theoretical values of substrate removal rates. The same kinetic model allowed the anaerobic degradation of phenolic compounds to be studied, obtaining the corresponding kinetic constants
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Published date: 29 December 2003
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Local EPrints ID: 74316
URI: http://eprints.soton.ac.uk/id/eprint/74316
ISSN: 1359-5113
PURE UUID: 2bd29a00-d571-47e8-9b53-4464050f52e3
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Date deposited: 11 Mar 2010
Last modified: 13 Mar 2024 22:30
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Author:
F. Raposo
Author:
R. Borja
Author:
E. Sanchez
Author:
M. A. Martin Santos
Author:
F. Martin
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