Fenton process for treatment of desizing wastewater

Treatment of simulated desizing wastewater by the Fenton process along with chemical coagulation was investigated. The simulated wastewater contained less than 0.2% polyvinyl alcohol (PVA) and Blue G (a direct dye) or Black B (a reactive dye). Experiments were conducted to investigate the effects of operating variables, including pH, temperature and the treatment time, on the COD removal efficiency. Optimal operating conditions were experimentally determined. Chemical coagulation using polyaluminum chloride and polymer was found to complement the Fenton treatment process in reducing the floc settling time, enhancing color removal and reducing Fe ion concentration. A two-step Fenton treatment process intended separately for chemical coagulation and chemical oxidation was observed to be only marginally better than the single-step one. A kinetic model for the Fenton treatment process was also proposed and the kinetic rate coefficients determined based on the experimental data.