Borja, R., Martin, A., Banks, C.J., Alonso, V. and Chica, A.
A kinetic study of anaerobic digestion of olive mill wastewater at mesophilic and thermophilic temperatures
Environmental Pollution, 88, (1), . (doi:10.1016/0269-7491(95)91043-K). (PMID:15091564).
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The kinetics of the anaerobic digestion of olive mill wastewater (OMW) was studied in the mesophilic and thermophilic ranges of temperature. Two completely mixed continuous flow bioreactors operating at 35°C and 55°C and with an average biomass concentration of 5·45 g VSS litre?1 were used. The thermophilic reactor worked satisfactorily between hydraulic retention times (HRT) of 10 to 40 days, removing between 94·6 and 84·4% of the initial chemical oxygen demand (COD). In contrast, the mesophilic reactor showed a marked decrease in substrate utilization and methane production at a HRT of 10 days. TVFA levels and the TVFA/alkalinity ratio were higher and close to the suggested limits for digester failure. The yield coefficient for methane production (1 CH4 STP g?1 CODadded) was 28% higher in the thermophilic process than in the mesophilic one.
Macroenergetic parameters, calculated using Guiot's kinetic model, gave yield coefficients for the biomass (Y) of 0·18 (mesophilic) and 0·06 g VSS g?1 COD (thermophilic) and specific rates of substrate uptake for cell maintenance (m) of 0·12 (mesophilic) and 0·27 g COD g?1 VSS.day?1 (thermophilic).
The experimental results showed the rate of substrate uptake (Rs; g COD g?1 VSS.day?1), correlated with the concentration of biodegradable substrate (Sb; g COD litre?1), through an equation of the Michaelis-Menten type for the two temperatures used.
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