Large Laboratory-Plant application for the treatment of a Tannery wastewater by Fenton oxidation: Fe(II) and nZVI catalysts comparison and kinetic modelling

HF demonstrated better performance, with respect to CF, towards both the removal of Chemical Oxygen Demand (COD), up to 75.5 ± 2.1%, and Total Polyphenols (TP), up to 85.1 ± 0.7%, from the TW. The CF optimal operating parameters were Cat/Ox (w/w) = 0.2 and pH = 2.5 whereas to maximize the HF efficiency a larger Cat/Ox (w/w) ratio, i.e. 0.5, was necessary. In addition, a lower amount of iron sludge was produced by HF with respect to CF (17.5-21.6%). Finally, a kinetic model on the reactions occurring in the HF/TW system was proposed and successfully used to fit experimental data.