Treatment of Wastewaters Containing Veterinary Antibiotics by Means of Sequential Physical and Chemical Processes Using a Natural Marine Material
Project no. 21070 · Status: Kapanmış · 2019
Summary
The aim of this thesis is to examine the feasibility of treating wastewater contaminated by veterinary antibiotics. The performances of single (adsorption and advanced oxidation processes) and hybrid (catalytic wet air oxidation and photo Fenton-like oxidation followed by adsorption) processes were tested in the presence of cuttlefish bone-based adsorbents and catalysts. Innovative, cost-effective and environmentally friendly adsorbents prepared from natural marine materials (cuttlefish bone, CFB) and CFB supported catalysts (CuFe2O4/CFB and LaCuO3/CFB) were prepared and their characterizations were carried out. SEM, XRD, FTIR, BET for CFB adsorbent; SEM, XPS, XRD, FTIR, BET, VSM characterizations were performed for catalysts. In the first step, adsorption and advanced oxidation methods were tested separately and suitable operation conditions were determined. The experimental plan was organized using the Minitab17 program and the response surface method (Box-Behnken design). At the end of the parametric study, optimum conditions were determined and kinetic study results was realized. The optimum conditions for oxytetracycline hydrochloride removal with cuttlefish bone adsorbent were determined as 0.09 g / L CFB, pH 8 and 282 rpm for 24% removal. The isotherm models of Langmuir, Freundlich, Temkin and Dubinin-Radushkevich have been studied and the Temkin isotherm has been selected as the most suitable isotherm. First and second order kinetic models were examined and the first order kinetic model was selected as the most suitable model. In the photo Fenton-like oxidation method performed with CuFe2O4/CFB catalyst, the optimum conditions for 1.5 g / L CuFe2O4/CFB, pH 4 and 4.76 mM hydrogen peroxide concentration were determined for 70% removal. In the photo Fenton-like oxidation method performed with LaCuO3/CFB catalyst, the optimum conditions of 0.77 g / L LaCuO3/CFB, pH 4 and 3.46 mM hydrogen peroxide concentration were determined for 83% removal. In the kinetic study performed with CuFe2O4/CFB catalyst, the most suitable model was chosen as the second order two-step model. In the kinetic study performed with the LaCuO3/CFB catalyst, the most suitable model was chosen as the second order single-step model. In the catalytic wet air oxidation method, CuFe2O4/CFB catalyst was chosen, and 75% removal was obtained at 0.5 g / L CuFe2O4/CFB, pH 4 and 100°C optimum condition. As the last step, for the hybrid study, AOPs were applied to the adsorption discharge under optimum conditions, so that the first steps were adsorption and 73%, 88% and 66% removal was achieved, respectively. In the kinetic study performed, the most suitable model was chosen as the first order two-step model.