Banks, C.J., Borja, R., Maestro, D.R. and Alba, J.
The effects of the most important phenolic constituents of olive mill wastewater on batch anaerobic methanogenesis
Environmental Technology, 17, (2), . (doi:10.1080/09593331708616373).
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The most important phenolic constituents of Olive Mill Wastewater (OMW), i.e. tyrosol, oleuropein and caffeic, p-hydroxybenzoic and protocatechuic acids, were added at various concentrations to aliquots of domestic anaerobic sludge in Hungate serum bottles and these were incubated at 35°C. The concentration of methane in the headspace gas was monitored to determine if the phenolics were fermented to methane or if they inhibited the anaerobic process. Only tyrosol and p-hydroxybenzoic acid were fermented to methane. At 600 mg l-1 (but not at 400 mgl-1) oleuropein reduced the rate and the amount of methane produced. The ortho-diphenols (caffeic and protocatechuic acids) were inhibitory at 1000 mg l-1 but not at 500 mg l-1. In cultures supplemented with acetic and propionic acids (VFA), and in unsupplemented cultures, tyrosol at concentrations up to 600 mg l-1 was fermented to methane. Between 900 and 1300 mg l-1 tyrosol methane production was neither enhanced nor inhibited relative to control cultures containing no tyrosol. Inhibition of methane production was evident when tyrosol was present at ? 2000 mg l-1. In similar experiments with p-hydroxybenzoic acid enhanced methane production was observed at concentrations of ? 500 mg l-1; no enhancement or inhibition was observed at 700 mg l-1; and inhibition was noted when p-hydroxybenzoic acid was present at ? 1000 mg l-1.
|Digital Object Identifier (DOI):
||Banks C. J., Borja R, Maestro D R, Alba J, (1996). "The effects of the most important phenolic constituents of olive mill wastewater on batch anaerobic methanogenesis." Environmental Technology, 17(2), 167-174
||phenolic compounds, methane, anaerobic digestion, inhibition, olive mill wastewater
||11 Mar 2010
||18 Apr 2017 20:43
|Further Information:||Google Scholar|
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