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| Phosphorus adsorption oniron and manganese biological sludge |
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Abstract The biogenic iron and manganese oxide applied were gained by backwashing from the biological iron and manganese removal filter columns. The research reported in this paper focused on its characteristics and adsorption- desorption properties on phosphorous. The results indicated that the oxide was spherical particle polymer with a developed pore structure mostly in the form of micropore, with a specific surface area of 285.6m2/g. The adsorption isotherm could be well described by Langmuir equation and Freundlich equation with a correlation coefficient larger than 0.9 and a high adsorption capacity of 39.06mg/g. The desorption percentage of adsorbed phosphorus was 13.04% in a neutral electrolyte of KNO3 under maximum phosphorous adsorption conditions. The adsorption enthalpy change △H0 was positive, which indicated the adsorption process was endothermic, meanwhile the minus Gibbs free energy change △G0 suggested it was spontaneous. It was found that the phosphorous adsorption kinetics fitted pseudo-second-order kinetic models.
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Received: 17 December 2013
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