Response surface methodology approach to optimization of process parameter for coagulation process of surface water using Moringa oleifera seed

Abstract

Recent researches have linked the use of synthetic coagulant for treatment of water with some neurodegenerative and neurotoxic diseases. In view of this, this study focused on the use of an eco-friendly natural coagulant, Moringa oleifera seed for the treatment of surface water. In order to obtain lowest turbidity of surface water, optimization of process variable affecting the coagulation of water was carried out using Response Surface Methodology (RSM). Four parameters were varied viz. settling time, agitation time, agitation speed and Moringa oleifera seed extract (MOSE) concentration and their effects on the turbidity of the surface water were established. The data obtained was fitted to a quadratic model which was also validated. The model predicted lowest turbidity of 5.49 NTU with optimal condition of 120 min of settling time, agitation speed of 100 rpm, 10 min of agitation time and 3 g/l of MOSE concentration. The condition was verified in replicates and turbidity of 5.51 NTU was obtained. The result obtained from this study could be applied to industrial scale for treatment of water. Keywords: Moringa oleifera, RSM, Surface water, Optimization, Coagulation