المجلة الدولية للعلوم والتقنية

Dyes are usually present in trace quantities in the treated effluents of many industries. The effectiveness of adsorption for dye removal from wastewaters has made it an ideal alternative to other expensive treatment methods. The removal of color from aquatic systems caused by presence of synthetic dyes is extremely important from the environmental viewpoint. The effectiveness of dye adsorption from wastewater has made to get alternative different low cost adsorbent to other expensive treatment methods. The ability of an unconventional bio-adsorbent, Olive Solid Wastes (OSW) for the adsorption of methylene blue (MB) from aqueous solution was studied. The effects of different system variables, adsorbent dosage, initial dye concentration, agitation speed, solution pH and contact time were studied. The results showed that as the amount of the (OSW) was increased with decreasing pH solution, (OSW) dose, contact time, and agitation speed whereas, the amount of MB removed increases with increasing initial MB concentration. Equilibrium data fitted very well with the Freundlich isotherm model, confirming the monolayer adsorption capacity of methylene blue onto (OSW) with a monolayer adsorption capacity of 56.65 mg/g. The results also showed that the process follows by pseudo second-order kinetics model.