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A study of the natural biodegradation of two-phase olive mill solid waste during its storage in an evaporation pond

A study of the natural biodegradation of two-phase olive mill solid waste during its storage in an evaporation pond
A study of the natural biodegradation of two-phase olive mill solid waste during its storage in an evaporation pond
A study of the natural biodegradation of two-phase olive mill solid waste (OMSW) during its storage in an evaporation pond was carried out. This system is traditionally used as the final disposal of this waste or constitutes a previous stage before being processed by cogeneration or anaerobic digestion processes. A laboratory-scale pond with a total volume of 520 l was used. The experiment was carried out between December 2002 and August 2003 covering a total period of 269 days. During the experiment, the variations of temperature (outside and inside the pond), the effective volume of the OMSW in the pond, moisture content, total solids (TS), volatile solids (VS), the total chemical oxygen demand (TCOD), total volatile acids (TVA), pH and cumulative methane production as a function of the operation time were evaluated. The experimental results obtained showed that the characteristics of the two-phase OMSW in the pond were dependent on the time of operation and temperature. During the experiment, three periods were clearly observed and differentiated:
(a) An initial period with a rapid reduction of moisture content and effective volume, with an increase of TS, VS and TCOD removals, a decrease of pH and an increase of TVA and methane production until day 21.
(b) A second period of slow decrease of moisture content and effective volume, due to the decrease of the ambient temperature. This period took place between day 21 and days 120–150 of assay, and it was characterised by a slight change in the OMSW properties.
(c) A third period where the characteristics of the waste in the pond changed considerably due to the increase of the temperature outside the pond. The methane gas production also showed an increase due to the increase of methanogenic activity with the increase of temperature.
An empirical model to describe the changes of two-phase OMSW characteristics and methane production with the operation time was developed. The proposed model, based on the use of polynomial equations, took into account the influence of the temperature and fit adequately into the experimental results obtained. It was found that the pond could probably be used as preliminary treatment of two-phase OMSW before its anaerobic digestion process, because a maximum conversion of organic matter to TVA was obtained after an operation time of around 200 days
0956-053X
477-486
Borja, R.
ed513484-04ff-4424-ab79-dc715ca63146
Sánchez, E.
8c460625-8a86-4050-baf5-c0d018fcd770
Raposo, F.
47104451-511a-4b03-aaa9-67348da4567d
Rincón, B.
d8fe6652-8ff6-4662-bfb7-3b231d140957
Jiménez, A.M.
19955253-d18a-4dfd-8c61-dd1980b150eb
Martín, A.
f8fb70e1-dda3-45de-9f02-cc3cfb53b729
Borja, R.
ed513484-04ff-4424-ab79-dc715ca63146
Sánchez, E.
8c460625-8a86-4050-baf5-c0d018fcd770
Raposo, F.
47104451-511a-4b03-aaa9-67348da4567d
Rincón, B.
d8fe6652-8ff6-4662-bfb7-3b231d140957
Jiménez, A.M.
19955253-d18a-4dfd-8c61-dd1980b150eb
Martín, A.
f8fb70e1-dda3-45de-9f02-cc3cfb53b729

Borja, R., Sánchez, E., Raposo, F., Rincón, B., Jiménez, A.M. and Martín, A. (2006) A study of the natural biodegradation of two-phase olive mill solid waste during its storage in an evaporation pond. Waste Management, 26 (5), 477-486. (doi:10.1016/j.wasman.2005.02.024).

Record type: Article

Abstract

A study of the natural biodegradation of two-phase olive mill solid waste (OMSW) during its storage in an evaporation pond was carried out. This system is traditionally used as the final disposal of this waste or constitutes a previous stage before being processed by cogeneration or anaerobic digestion processes. A laboratory-scale pond with a total volume of 520 l was used. The experiment was carried out between December 2002 and August 2003 covering a total period of 269 days. During the experiment, the variations of temperature (outside and inside the pond), the effective volume of the OMSW in the pond, moisture content, total solids (TS), volatile solids (VS), the total chemical oxygen demand (TCOD), total volatile acids (TVA), pH and cumulative methane production as a function of the operation time were evaluated. The experimental results obtained showed that the characteristics of the two-phase OMSW in the pond were dependent on the time of operation and temperature. During the experiment, three periods were clearly observed and differentiated:
(a) An initial period with a rapid reduction of moisture content and effective volume, with an increase of TS, VS and TCOD removals, a decrease of pH and an increase of TVA and methane production until day 21.
(b) A second period of slow decrease of moisture content and effective volume, due to the decrease of the ambient temperature. This period took place between day 21 and days 120–150 of assay, and it was characterised by a slight change in the OMSW properties.
(c) A third period where the characteristics of the waste in the pond changed considerably due to the increase of the temperature outside the pond. The methane gas production also showed an increase due to the increase of methanogenic activity with the increase of temperature.
An empirical model to describe the changes of two-phase OMSW characteristics and methane production with the operation time was developed. The proposed model, based on the use of polynomial equations, took into account the influence of the temperature and fit adequately into the experimental results obtained. It was found that the pond could probably be used as preliminary treatment of two-phase OMSW before its anaerobic digestion process, because a maximum conversion of organic matter to TVA was obtained after an operation time of around 200 days

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Published date: May 2006

Identifiers

Local EPrints ID: 53025
URI: https://eprints.soton.ac.uk/id/eprint/53025
ISSN: 0956-053X
PURE UUID: 38428ac1-e3a6-4429-ae26-946f594ec1ea

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Date deposited: 17 Jul 2008
Last modified: 20 Dec 2018 17:31

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Contributors

Author: R. Borja
Author: E. Sánchez
Author: F. Raposo
Author: B. Rincón
Author: A.M. Jiménez
Author: A. Martín

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