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Impact of the main phenolic compounds of olive mill wastewater (OMW) on the kinetics of acetoclastic methanogenesis

Impact of the main phenolic compounds of olive mill wastewater (OMW) on the kinetics of acetoclastic methanogenesis
Impact of the main phenolic compounds of olive mill wastewater (OMW) on the kinetics of acetoclastic methanogenesis
Bench-scale tests were conducted to assess the impact of the most representative phenolic compounds present in olive mill wastewater (OMW), two cinnamic acid derivatives (p-coumaric and caffeic acids) and two benzoic acid derivatives (p-hydroxybenzoic and protocatechuic acids), on the kinetics of acetoclastic methanogenesis. Phenolic compounds were added to cultures transferred from an acetate-enriched seed culture reactor. A control without phenolic compound was included as a basis for comparison. Unacclimated cultures were used to minimize the biodegradation of the toxic organic chemicals during the test. A finite-difference, non-linear, least-squares algorithm was used to estimate kinetic parameters by obtaining a best fit of the experimental data to the classical Monod growth and substrate utilization model. Resulting kinetic coefficients revealed substantial changes in both the maximum rate of acetate conversion, k, and the half-velocity coefficient, Ks, when both cinnamic and benzoic acid derivatives were used. The relative effect of the phenolic compound was manifested in a decrease in the value of k or an increase in the value of Ks as the phenolic compound concentration increased. Therefore, mixed inhibition was occurring. In addition, the toxic effects were clearly related to the molecular structure of the phenolic compound in each pair of toxicants studied, the inhibitory impact being greater for the ortho-diphenols (caffeic and protocatechuic acids) in relation to their corresponding monophenolic compounds (p-coumaric and p-hydroxybenzoic acids, respectively).
1359-5113
121-133
Borja, Rafael
68c613c6-300d-4663-b6ec-7f9357b7221b
Alba, José
ae65eb22-2749-4918-a7be-e64b77855076
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Borja, Rafael
68c613c6-300d-4663-b6ec-7f9357b7221b
Alba, José
ae65eb22-2749-4918-a7be-e64b77855076
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f

Borja, Rafael, Alba, José and Banks, Charles J. (1997) Impact of the main phenolic compounds of olive mill wastewater (OMW) on the kinetics of acetoclastic methanogenesis. Process Biochemistry, 32 (2), 121-133. (doi:10.1016/S0032-9592(96)00055-6).

Record type: Article

Abstract

Bench-scale tests were conducted to assess the impact of the most representative phenolic compounds present in olive mill wastewater (OMW), two cinnamic acid derivatives (p-coumaric and caffeic acids) and two benzoic acid derivatives (p-hydroxybenzoic and protocatechuic acids), on the kinetics of acetoclastic methanogenesis. Phenolic compounds were added to cultures transferred from an acetate-enriched seed culture reactor. A control without phenolic compound was included as a basis for comparison. Unacclimated cultures were used to minimize the biodegradation of the toxic organic chemicals during the test. A finite-difference, non-linear, least-squares algorithm was used to estimate kinetic parameters by obtaining a best fit of the experimental data to the classical Monod growth and substrate utilization model. Resulting kinetic coefficients revealed substantial changes in both the maximum rate of acetate conversion, k, and the half-velocity coefficient, Ks, when both cinnamic and benzoic acid derivatives were used. The relative effect of the phenolic compound was manifested in a decrease in the value of k or an increase in the value of Ks as the phenolic compound concentration increased. Therefore, mixed inhibition was occurring. In addition, the toxic effects were clearly related to the molecular structure of the phenolic compound in each pair of toxicants studied, the inhibitory impact being greater for the ortho-diphenols (caffeic and protocatechuic acids) in relation to their corresponding monophenolic compounds (p-coumaric and p-hydroxybenzoic acids, respectively).

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Published date: February 1997

Identifiers

Local EPrints ID: 75300
URI: http://eprints.soton.ac.uk/id/eprint/75300
ISSN: 1359-5113
PURE UUID: c0d3d9a1-30ea-40ef-8477-633bed762d71
ORCID for Charles J. Banks: ORCID iD orcid.org/0000-0001-6795-814X

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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:39

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Author: Rafael Borja
Author: José Alba

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