Experimental Design and Response Surface Methodologies Use for the Treatment of Leachates by Electrocoagulation Process

Abstract

In order to optimize conditions for the treatment of leachates by electrocoagulation process by using aluminum (Al) electrodes, the experimental design methodology was applied. Indeed, all factors considered have an important effect to treat leachates which likely contaminate groundwater, rivers and grounds. The investigated variables were initial pH (U 1 ), reaction time (U 2 ) and applied current density "J" (U 3 ). The response surface methodology was applied by using the Doehlert Matrix. The statistical analysis was performed by using NemrodW software (LPRAI, version 2000). Suitability of the model and the success of Doehlert Matrix design for the optimization of the electrocoagulation process indicates that the predicted and experimental values were in fair agreement. In addition, the postulated model is valid and predictive. According to the response surface methodology, the optimal conditions for 98% of COD and 97% of color intensity removal responses were found at the current density 14.4 mA cm −2 ; the reaction time 72.5 min and the initial pH 6.2.