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The effect of organic loading rate on the anaerobic digestion of two-phase olive mill solid residue derived from fruits with low ripening index

The effect of organic loading rate on the anaerobic digestion of two-phase olive mill solid residue derived from fruits with low ripening index
The effect of organic loading rate on the anaerobic digestion of two-phase olive mill solid residue derived from fruits with low ripening index
A study of the effect of organic loading rate on the performance of anaerobic digestion of two-phase olive mill solid residue (OMSR) was carried out in a laboratory-scale completely stirred tank reactor. The reactor was operated at an influent substrate concentration of 162 g chemical oxygen demand (COD) dm-3. The organic loading rate (OLR) varied between 0.8 and 11.0 g COD dm-3 d-1. COD removal efficiency decreased from 97.0% to 82.6% when the OLR increased from 0.8 to 8.3 g COD dm-3 d-1. It was found that OLRs higher than 9.2 g COD dm-3 d-1 favoured process failure, decreasing pH, COD removal efficiency and methane production rates (QM). Empirical equations described the effect of OLR on the process stability and the effect of soluble organic matter concentration on the total volatile fatty acids (TVFA)/total alkalinity (TAlk) ratio (). The results obtained demonstrated that rates of substrate uptake were correlated with concentration of biodegradable COD, through an equation of the Michaelis-Menten type. The kinetic equation obtained was used to simulate the anaerobic digestion process of this residue and to obtain the theoretical COD degradation rates in the reactor. The small deviations obtained (equal to or lower than 10%) between values calculated through the model and experimental values suggest that the proposed model predicts the behaviour of the reactor accurately
anaerobic digestion, organic loading rate, performance, kinetics, completely stirred tank reactor, two-phase olive mill solid residue (omsr), low ripening index
0268-2575
259-266
Rincón, Bárbara
f50179e9-9afe-44d7-a300-6e7bfdfa16c2
Travieso, Lissette
7e2345e8-0c2b-4e1f-ba52-533696fdaf52
Sánchez, Enrique
5d2edb25-1b03-4cf3-875a-657858eabb46
de los Ángeles Martín, María
924a3661-33a0-49d1-a6d5-ea1877a54605
Martín, Antonio
d4cc0fbd-0498-4d86-b6aa-eaaf8d67e346
Raposo, Francisco
153c7b3f-d29e-422c-a349-e89ca4258265
Borja, Rafael
68c613c6-300d-4663-b6ec-7f9357b7221b
Rincón, Bárbara
f50179e9-9afe-44d7-a300-6e7bfdfa16c2
Travieso, Lissette
7e2345e8-0c2b-4e1f-ba52-533696fdaf52
Sánchez, Enrique
5d2edb25-1b03-4cf3-875a-657858eabb46
de los Ángeles Martín, María
924a3661-33a0-49d1-a6d5-ea1877a54605
Martín, Antonio
d4cc0fbd-0498-4d86-b6aa-eaaf8d67e346
Raposo, Francisco
153c7b3f-d29e-422c-a349-e89ca4258265
Borja, Rafael
68c613c6-300d-4663-b6ec-7f9357b7221b

Rincón, Bárbara, Travieso, Lissette, Sánchez, Enrique, de los Ángeles Martín, María, Martín, Antonio, Raposo, Francisco and Borja, Rafael (2007) The effect of organic loading rate on the anaerobic digestion of two-phase olive mill solid residue derived from fruits with low ripening index. Journal of Chemical Technology and Biotechnology, 82 (3), 259-266. (doi:10.1002/jctb.1663).

Record type: Article

Abstract

A study of the effect of organic loading rate on the performance of anaerobic digestion of two-phase olive mill solid residue (OMSR) was carried out in a laboratory-scale completely stirred tank reactor. The reactor was operated at an influent substrate concentration of 162 g chemical oxygen demand (COD) dm-3. The organic loading rate (OLR) varied between 0.8 and 11.0 g COD dm-3 d-1. COD removal efficiency decreased from 97.0% to 82.6% when the OLR increased from 0.8 to 8.3 g COD dm-3 d-1. It was found that OLRs higher than 9.2 g COD dm-3 d-1 favoured process failure, decreasing pH, COD removal efficiency and methane production rates (QM). Empirical equations described the effect of OLR on the process stability and the effect of soluble organic matter concentration on the total volatile fatty acids (TVFA)/total alkalinity (TAlk) ratio (). The results obtained demonstrated that rates of substrate uptake were correlated with concentration of biodegradable COD, through an equation of the Michaelis-Menten type. The kinetic equation obtained was used to simulate the anaerobic digestion process of this residue and to obtain the theoretical COD degradation rates in the reactor. The small deviations obtained (equal to or lower than 10%) between values calculated through the model and experimental values suggest that the proposed model predicts the behaviour of the reactor accurately

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More information

Published date: March 2007
Keywords: anaerobic digestion, organic loading rate, performance, kinetics, completely stirred tank reactor, two-phase olive mill solid residue (omsr), low ripening index

Identifiers

Local EPrints ID: 53042
URI: http://eprints.soton.ac.uk/id/eprint/53042
ISSN: 0268-2575
PURE UUID: 3fa01e16-8bf6-4c1b-8dd5-0bbe2427a5eb

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Date deposited: 17 Jul 2008
Last modified: 15 Mar 2024 10:39

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Contributors

Author: Bárbara Rincón
Author: Lissette Travieso
Author: Enrique Sánchez
Author: María de los Ángeles Martín
Author: Antonio Martín
Author: Francisco Raposo
Author: Rafael Borja

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