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

Sisay Tadesse, Ermias Haile


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

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ISSN (Paper)2224-6088 ISSN (Online)2225-0557

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