Moringa stenopetala Seed Cake Powder as Biosorbent for Wastewater Treatment and Its Adsorption Isotherm and Thermodynamic Study

Abstract

The aim of this work was to study the effectiveness of a coagulant that removes different pollutants. Adsorbent dose, contact time, and temperature in different turbidity were evaluated. The adsorbent dose were varied from 20–160 mg/l. The time were varied from 10 min– 310 min. The optimal conditions of adsorption obtained were 100 mg/l of adsorbent dose and 45 min contact time for high turbid (361 to 465 NTU) water and  40 mg/l for low turbid (36.8 to 39.9 NTU) water. Moringa stenopetala is effective for high turbidity (98.5%). From 0.1 mg/l initial concentration of the metals, the highest removal efficiency of 82.9% was found for Pb and the lowest for Cr (53.18%). The results showed better fit by the Freundlich models, describing a multilayer adsorption. The thermodynamic studies suggested that a high temperature favors for the adsorption of heavy metals on M. stenopetala, indicating a spontaneous adsorption process.

Keywords: M.stenopetala, Wastewater Treatment, Adsorption isotherm, Thermodynamic study