This research study investigated the suitability of lateritic soil as
a coagulant for landfill leachate treatment and is compared it with
a conventional coagulant, aluminum sulfate (alum). The appropriate
implementation of this method depends upon how precisely
the pH and coagulant dosage of the lateritic soil are chosen. Central
composite design (CCD) of response surface methodology was used
to build model and determine the optimum conditions. COD, color,
ammoniacal-nitrogen removal and SVI determination were monitored
throughout the experiment. Hence, the statistical design was
based on two factors (pH and coagulant dosage) and two responses
(percentage of COD and color removal).