Mechanistic evaluation of the sorption properties of endocrine disrupting chemicals in sewage sludge biomass

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Abstract

This study investigated the sorption behaviour of two endocrine disrupting chemicals; 17b-estradiol (E2) and 17b-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 DS 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.
Original languageEnglish
Pages (from-to)617-622
JournalInternational Journal of Environmental Science and Technology
Volume7
Issue number4
Publication statusPublished - 2010

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Keywords

  • enthalpy
  • entropy
  • partitioning coefficient
  • sludge
  • sorption

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