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This investigation deals with the use of orange peel (OP) waste as adsorbent for removal of nitrate (NO3) from simulated wastewater. Orange peel prepared in two conditions dried at 60C° (OPD) and burning at 500 °C (OPB). The effect of pH: 2-10, contact time: 30- 180 min, sorbent weight: 0.5- 3.0 g were considered. The optimal pH value for NO3 adsorption was found to be 2.0 for both adsorbents. The equilibrium data were analyzed using Langmuir and Freundlich isotherm models. Freundlich model was found to fit the equilibrium data very well with high-correlation coefficient (R2). The adsorption kinetics was found to follow pseudo-second-order rate kinetic model, with a good correlation (R2 > 0.95 and 0.94) for the orange peel adsorbent at 500 °C (OPB) and at 60 °C (OPD), respectively. The results showed that the orange peel was found to be an attractive low cost adsorbent for the treatment of wastewater.

Pomegranate peels were chosen for the ability to adsorption of lead ions from the simulated wastewater. It has been tested under various experimental parameters such as pH, contact time, weight of sorbent, and concentration of metal and effect of temperature. The outcomes indicated that adsorption of Pb (II) ions on the pomegranate peels can be appropriated with the Langmuir adsorption model and pseudo-second-order kinetic model. Result showed that the Pomegranate peel was found to be low-cost adsorbent for the removal of contaminates. A good efficiency to remove toxic metal ions was achieved by usage of such by- product.