International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
Vol. 7, No. 4, 2010, pp. 617-622
Bioline Code: st10061
Full paper language: English
Document type: Research Article
Document available free of charge
International Journal of Environment Science and Technology, Vol. 7, No. 4, 2010, pp. 617-622
© Copyright 2010 - Center for Environment and Energy Research and Studies (CEERS)
Mechanistic evaluation of the sorption properties of endocrine disrupting chemicals in sewage sludge biomass|
Ifelebuegu, A.O.; Theophilus, S.C. & Bateman, M.J.
This study investigated the sorption behaviour of two endocrine disrupting chemicals; 17β-estradiol (E2) and 17β-ethinylestradiol and their thermodynamic properties in an activated sludge biomass. The partition coefficient values measured for E2 and EE2 at varying temperatures range from 245 - 604 L/kg ( log Kd 2.39 -2.78) and 267 - 631 L/kg (Log Kd 2.43 - 2.80), respectively. The Kd values were inversely related to temperature. The average percentages of E2 and EE2 adsorbed to the solid phase at 4.3 % dry solid were 87.2 % and 92.5 %, respectively. Sorption of E2 and EE2 to the activated sludge biomass was found to be spontaneous and entropy retarded with DG values in the range of -13 to -16 KJ/mol and ΔS value of -105.2J/mol/K and 96.7 J/mol/k for E2 and EE2, respectively. The enthalpy changes for E2 and EE2 were - 45.7KJ/mol and - 43.4KJ/mol respectively, demonstrating that the sorption process is exothermic. The values of the enthalpy changes also show that the mechanism of sorption is physisorption with some element of chemisorption.
Enthalpy; Entropy; Partitioning coefficient; Sludge; Sorption
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