Optimization of Electrocoagulation-Flocculation for Chlorella Vulgaris Biomass Recovery Using Response Surface Methodology

Abstract

The issue of how to economically harvest and recover algal biomass has always been of concern to green wastewater treatment systems utilizing microalgal technology. This study explores the efficiency of biomass recovery from Chlorella Vulgaris using an electrocoagulation-flocculation method, aiming to optimize the environmentally friendly harvesting of algal biomass. Utilizing a response surface methodology (RSM) with a central composite design (CCD), the research investigates the impact of pH, current intensity, reaction time, and salinity on recovery efficiency. Optimal conditions were identified as a pH of 6.5, current intensity of 1.5A, reaction time of 20 minutes, and a salinity of 15ppt, achieving an optimal recovery efficiency of 84.36%. The findings underscore the significant influence of pH, where deviations from the optimum value substantially reduced efficiency. This study confirms that electrocoagulation is a viable and effective method for enhancing Chlorella Vulgaris biomass recovery, offering a sustainable alternative to traditional chemical flocculation methods by reducing dependency on chemical coagulants and minimizing production costs. The results provide a solid scientific basis for future enhancements in the sustainable industrial application of algae, promoting environmental protection and economic viability.