Grasas y Aceites, Vol 50, No 2 (1999)

Kinetic study of anaerobic digestion of wastewaters from the washing of olives prior to the oil production process in a completely mixed reactor with immobilised microorganisms.


https://doi.org/10.3989/gya.1999.v50.i2.640

Rafael Borja
Instituto de la Grasa (C.S.I.C)., Spain

José Alba
Instituto de la Grasa (C.S.I.C)., Spain

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

Angela Mancha
Instituto de la Grasa (C.S.I.C)., Spain

Abstract


A kinetic study of the continuous anaerobic digestion process of wastewaters from the washing of olives prior to the oil production process was carried out in a completely mixed reactor with sepiolite immobilised biomass at 35° C. Four influent COD concentrations, 4,5, 3,5, 2,5 y 1,5 g COD/I were used as substrate operating for a hydraulic retention time range of 4,5 to 1,25 days. The Michaelis-Menten model has been applied, obtaining the values of the maximum substrate utilization rate, k( (g COD/g VSS day), and the kinetic constant of the process, Ks (g COD/I), for each influent substrate concentration studied. The values of these parameters significantly decreased with decreasing concentration of influent wastewater, showing the highest values for the greatest influent substrate concentration used as feed. The microbial yield coefficient, Yx, and sludge decay rate coefficient, kd, were also determined to be 0,14 g VSS/g COD and 0,003 days-1 respectively.

Keywords


Anaerobic digestion; Completely mixed reactor; Immobilised microorganisms; Kinetic; Olive; Waste water from washing.

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