Adsorption of Phosphate ton by Various Ion Exchange Regins Loaded with Iron(III)

Abstract

The adsorption behaviors of phosphate ion in water and of phtsporus in the effluent from a sewage treatment plant by thirteen ion exchange resins which were loaded with iron (III) ion were investigated. The ion exchange regins inveitigated in This study were Amberlite IR 120 B, 200 C, Diaion WK 10, WK 11, WK 20, Amberlite IRC 50, Fumiace, Dowex A 1, Diaion CR 10, CR 11, CR 12, Uniselec UR 10 and UR 40, as shown in Table 1. The concentration of phosphate ion in the resion, Q, and in the aqueous phase, C, after equilibration of acetate buffered solution, followed the Freundlich's law of Q=KC^1/n. Similar results were observed on the effluent from a sewage treatment plant. The constant K and 1/n were found to be useful parameters for evaluating the iron(III)-loacted cation exchange resins as the adsorbent for phosphate ion. The most prospective one was Dowex Al-Fe(III) (1/n=0.46, log K=0.60). The adsorbed phosphate ion was able to be eluted- by the treatment with 2 mol/l sodium hydroxide, and the resin was eventuallytreated with 0.1 mol/l hydrochloric acid for the next adsorption cycle.