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Determination of optimal conditions for removal of isoproturon and oxytetracycline by ferrate(IV) oxidation

Pesticides and pharmaceuticals are organic compounds of high chemical stability. They are designed to be resistant to biological removal as well as to the sunlight degradation. Therefore, technologies used in primary and secondary wastewater treatment are not efficient in removing of these compounds. Accordingly, alternative methods are needed for their effective removal. One of possibilities is treatment by ferrate(VI) ion, [FeO4]2-, a chemical compound that simultaneously exhibits oxidation, disinfection and coagulation properties. The aim of the study was to investigate the removal of pesticide isoproturon and pharmaceutic oxytetracycline by ferrate(VI) oxidation. The influence of two basic process parameters: the oxidant’s concentration and solution’s pH value, on the removal-efficiency was examined during the study. Two related mathematical models (one for each pollutant) were developed by applying multiple linear regression on the experimental data and the optimal removal-conditions were determined. The analysis of the variance indicated that both examined parameters were significant for removal of isoproturon while pH-value manifested as insignificant for removal of oxytetracycline.

priority substances ; isoproturon ; oxytetracycline ; ferrate(IV) oxidation ; response surface modeling

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