[Removal of phosphate from aqueous solutions by Iron Nano Particle Resin Lewatit [FO36]]

Entrance of phosphorous into the lakes leads to algae growth and eutrophication the aim of this study was to assess the efficiency of iron nano particles as a new suitable and applicable method for removal of phosphorous. In this study Lewatit FO36 resin was covered with Fe [III] nano-particles, and it was used as a new way to eliminate phosphate. Column experiments were carried out in 11 stages in fixed bed columns with constant flow rate of 9 ml/min and the empty bed contact time [EBCT] of 2.1 min. phosphate solutions with concentrations of 1 to 16 mg produced at neutral PH were used in 6 steps of experiment NaOH and NaCl solutions were used for regeneration of resin. Then the effect of competing anions, chloride, sulfate, bicarbonate and their compounds on the efficiency of the resin was assessed. Finally the efficiency of the resin for removal of phosphate from water treatment plant sewage in Ghods suburb was studied. Data were analyzed by SPSS 13 soft ware. The capacities of adsorption of phosphate, with concentrations of 1 to 16 mg, by each gram of resin were 1.31, 1.35, 1.53, 1.64, 1.7 and 1.75. The capacity of regenerated resin for removal of phosphate with a concentration of 6 mg/l was 1.6 mg for each gram of resin which showed a 8.5% decrease. The result of this study showed increased adsorptive capacity of resin with increased concentration of phosphate. Chloride, sulfate, bicarbonate ions and the combined anions had no effect on phosphate removal

Removal of chromium [VI] from aqueous solutions using lewatit FO36 nano ion exchange resin

The removal of the chromium [VI] ion from aqueous solutions with the Lewatit FO36 ion-exchange resin is described at different conditions. The effects of adsorbent dose, initial metal concentration, contact time and pH on the removal of chromium [VI] were investigated. The batch ion exchange process was relatively fast and it reached equilibrium after about 90 min of contact. The ion exchange process, which is pH dependent showed maximum removal of chromium [VI] in the pH range 5.0-8.0 for an initial chromium [VI] concentration of 0.5 mg/dm[3]. The equilibrium related to Lewatit FO36 ion- exchange capacity and the amounts of the ion exchange were obtained using the plots of the Langmuir adsorption isotherm. It was observed that the maximum ion exchange capacity of 0.29 mmol of chromium [VI]/g for Lewatit FO36 was achieved at optimum pH value of 6.0. The ion exchange of chromium [VI] on this cation-exchange resin followed first-order reversible kinetics