Grasas y Aceites, Vol 44, No 2 (1993)

Characterization and anaerobic digestion of waters from washing of virgin olive oil


https://doi.org/10.3989/gya.1993.v44.i2.1102

R. Borja
Instituto de la Grasa y sus Derivados (CSIC), Spain

J. Alba
Instituto de la Grasa y sus Derivados (CSIC), Spain

A. Martín
Departamento de Ingeniería Química. Facultad de Ciencias. Universidad de Córdoba, Spain

A. Ruiz
Instituto de la Grasa y sus Derivados (CSIC), Spain

F. Hidalgo
Instituto de la Grasa y sus Derivados (CSIC), Spain

Abstract


A characterization and kinetic study of the anaerobic digestion of waters from washing of virgin olive oil were carried out. The experimental setup used consisted of a 1;litre thorough mixing bioreactor that was operated at 35 °C and loaded with sepiolite-immobilized biomass at a concentration of 10.8 g VSS/L. The bioreactor worked satisfactorily for a hydraulic retention time of 1.1 to 5.0 days and eliminated more than 92% of the initial COD in all instances.
Guiot's kinetic model was used to determine the macroenergetic parameters of the system, which was found to have a true yield coefficient for the biomass Y = 0.006 g VSS/g COD and a specific rate of substrate uptake for cell maintenance m = 0.072 g COD/g VSS ∙ day.
According to the experimental results obtained, the rate of substrate uptake, Rs (g COD/g VSS ∙ day), was correlated with the concentration of biodegradable substrate, Sb (g COD/L), through an equation of the Michaelis-Menten type.

Keywords


Anaerobic digestion; Kinetics; Macroenergetic parameters; Virgin olive oil; Waters from washing

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