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Performance and microbial communities of a continuous stirred tank anaerobic reactor treating two-phases olive mill solid wastes at low organic loading rates

Record type: Article

A study of the performance and microbial communities of a continuous stirred tank reactor (CSTR) treating two-phases olive mill solid wastes (OMSW) was carried out at laboratory-scale. The reactor operated at a mesophilic temperature (35 °C) and an influent substrate concentration of 162 g total chemical oxygen demand (COD) L?1 and 126 g volatile solids (VS) L?1. The data analyzed in this work corresponded to a range of organic loading rates (OLR) of between 0.75 and 3.00 g COD L?1 d?1, getting removal efficiencies in the range of 97.0–95.6%. Methane production rate increased from 0.164 to 0.659 L CH4 Lreactor?1 d?1 when the OLR increased within the tested range. Methane yield coefficients were 0.225 L CH4 g?1 COD removed and 0.290 L CH4 g?1 VS removed and were virtually independent of the OLR applied. A molecular characterization of the microbial communities involved in the process was also accomplished. Molecular identification of microbial species was performed by PCR amplification of 16S ribosomal RNA genes, denaturing gradient gel electrophoresis (DGGE), cloning and sequencing. Among the predominant microorganisms in the bioreactor, the Firmicutes (mainly represented by Clostridiales) were the most abundant group, followed by the Chloroflexi and the Gamma-Proteobacteria (Pseudomonas species as the major representative). Other bacterial groups detected in the bioreactor were the Actinobacteria, Bacteroidetes and Deferribacteres. Among the Archaea, the methanogen Methanosaeta concilii was the most representative species.

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Citation

Rincon, B., Raposo, F., Borja, R., Gonzalez, J.M., Portillo, M.C. and Saiz-Jimenez, C. (2006) Performance and microbial communities of a continuous stirred tank anaerobic reactor treating two-phases olive mill solid wastes at low organic loading rates Journal of Biotechnology, 121, (4), pp. 534-543. (doi:10.1016/j.jbiotec.2005.08.013).

More information

Published date: February 2006
Keywords: two-phases olive mill solid waste, anaerobic digestion, performance, microbial community

Identifiers

Local EPrints ID: 53022
URI: http://eprints.soton.ac.uk/id/eprint/53022
ISSN: 0168-1656
PURE UUID: 4c77acb3-a8bc-436b-9cff-0db5f670157f

Catalogue record

Date deposited: 22 Jul 2008
Last modified: 17 Jul 2017 14:39

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Contributors

Author: B. Rincon
Author: F. Raposo
Author: R. Borja
Author: J.M. Gonzalez
Author: M.C. Portillo
Author: C. Saiz-Jimenez

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