UPGRADING OF MOROCCAN OLIVE MILL WASTEWATER USING ELECTROCOAGULATION: KINETIC STUDY AND PROCESS PERFORMANCE EVALUATION

Reda Elkacmi, Noureddine Kamil, Mounir Bennajah

Abstract


Treatment of olive mill wastewater (OMW) by electrocoagulation (EC) was investigated in a stirred tank reactor (STR), the effect of different influential parameters, namely, contact time, current density and pH was determined. Over 72 % of COD, 93 % of polyphenols and 95 % of color intensity were removed efficiently at pH of 5.2, current density of 58.33 mA/cm2 and a residence time of 45 min. A kinetic study of these three parameters was carried out and both COD and dark color removal obey the first-order law model. On the other hand, the polyphenols reduction, fits the pseudo second-order model with current- dependent parameters. A variable order kinetic (VOK) model derived from the Langmuir-Freundlish equation was proposed to determine the kinetics of pollutant removal reactions with EC. Results showed that the model equations strongly fit the experimental concentrations of the three pollutants.

Keywords


Olive mill wastewater; Electrocoagulation; COD; polyphenols; kinetic study; variable order kinetic

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DOI: https://doi.org/10.4090/juee.2015.v11n1.30-41

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ISSN 1982-3932
DOI: 10.4090/juee


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