2 research outputs found
Potential microbial toxicity and non-target impact of different concentrations of glyphosate-containing herbicide (GCH) in a model pervious paving system
Mechanistic evaluation of the sorption properties of endocrine disrupting chemicals in sewage sludge biomass
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