Comparative study of electrode material (aluminium and stainless steel) for treatment by electrocoagulation of Vinasse liquid from sugar beet industry

Abstract

The treatment of industrial wastewater has seen significant advancements in technology. Among these industries, the molasses sector has become one of the most rapidly growing economic segments worldwide. The industrial waste generated, particularly vinasse, is rich in organic matter and exhibits pollution levels that far exceed acceptable discharge standards for surface waters. This study focuses on treating vinasse using the electrocoagulation technique, employing aluminum and iron electrodes. Current densities of 0.01, 0.025, and 0.05 A/cm² were applied to assess their efficiency in treating vinasse effluent. Operating parameters such as pH, conductivity, and electrode dissolution kinetics were monitored. High abatement rates were achieved at 0.05 A/cm² for both electrode types. Turbidity was reduced with an efficiency of 64 % for the aluminum electrode and 61 % for the iron electrode, while the chemical oxygen demand was decreased by 69 % and 72 %, respectively. Monitoring the dissolution kinetics of the electrodes over 8 h demonstrated that similar efficiency levels could be achieved with reduced electrolysis time and increased current density. The treated water was partially treated and requires further biological treatment to meet discharge standards or for safe reuse.