Abstract
A kinetic study of anaerobic digestion of olive mill wastewater in the mesophilic (from 30oC to 40°C) and thermophilic (from 50oC to 60oC) ranges of temperature has been carried out. Two reactors containing suspended biomass were used. The Chen-Hashimoto substrate utilization kinetic model has been applied, obtaining the values of the maximum specific growth rate of microorganisms, μ max ,. and the kinetic constant, K, for each case studied. The obtained results showed an increase of 55% and 34% for μ max and K, respectively, of the thermophilic anaerobic digestion process in relation to the mesophilic process. The substrate utilization maximum rate value was reached for the hydraulic retention times of 7,7 and 11,6 days, for the thermophilic and mesophilic processes, respectively.
Highlights
The Chen-Hashimoto substrate utilization kinetic model has been applied, obtaining the values of the maximum specific growth rate of microorganisms, p.,na,. and the kinetic constant, K, for each case studied
The obtained results showed an increase of 55% and 34% for fi.„n» and K, respectively, of the thermophilic anaerobic digestion process in relation to the mesophilic process
The substrate utilization maximum rate value was reached for the hydraulic retention times of 7,7 and 11,6 days, for the thermophilic and mesophilic processes, respectively
Summary
Kinetic study of anaerobic digestion process of olive mill wastewater in the mesophilic and thermophilic ranges of temperature. A kinetic study of anaerobic digestion of olive mill wastewater in the mesophilic (from 30"C to 40°C) and thermophilic (from 50=C to 60''C) ranges of temperature has been carried out. The Chen-Hashimoto substrate utilization kinetic model has been applied, obtaining the values of the maximum specific growth rate of microorganisms, p.,na,. The obtained results showed an increase of 55% and 34% for fi.„n» and K, respectively, of the thermophilic anaerobic digestion process in relation to the mesophilic process. The substrate utilization maximum rate value was reached for the hydraulic retention times of 7,7 and 11,6 days, for the thermophilic and mesophilic processes, respectively. KEY-WORDS: Anaerobic digestion - Kinetics - Mesoptiilic process Olive mill wastewater - Thermophilic process
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