Effects of the addition of iron and aluminum salt on phosphorus adsorption in wetland sediment

Huang, Shuhui; Huang, Hong; Zhu, Huayue

Effects of the addition of iron and aluminum salt on phosphorus adsorption in wetland sediment

2016

Huang, Shuhui | Huang, Hong | Zhu, Huayue

Adsorption and removal of phosphorus (P) in wetland sediment from aqueous solutions were investigated by using four kinds of iron (Fe) and aluminum (Al) salt (FeCl₃, AlCl₃, poly FeCl₃, and poly AlCl₃). Under optimal temperature of 25 °C, P concentration of 50 mg/L, and mole concentration ratio of 4:1 (Fe³⁺/PO₄ ³⁻ or Al³⁺/PO₄ ³⁻), the P sorption capacities of wetland sediments by FeCl₃, poly FeCl₃, AlCl₃, and poly AlCl₃treatments were 296.03, 371.41, 276.3, and 357.85 μg/g, respectively, and were enhanced by 83.36, 158.74, 63.63, and 145.18 μg/g, respectively. The P sorption capacities based on different additives were in the order of poly FeCl₃ > poly AlCl₃ > FeCl₃ > AlCl₃. The EPC0 values, K values, and maximum adsorption capacities indicated that poly FeCl₃ was good reagent to restore P pollution in aqueous solution by wetland sediment in the consideration of both P treatment efficiency and potential environmental impact. These findings, obviously, are useful basis to develop new effective methods for P removal in waters.

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