OXIDATION OF HEXACHLORBENZENE BY THE DIRECT FENTON AND EF-FEOX METHOD

摘要

Hexachlorbenzene (HCB), one of the persistent organic pollutants (POPs), is a refractory semivolatile organic compound and non-biodegradable. Treatment of HCB contaminated wastewater by traditional biochemical method is essentially impossible. In this study, the Fenton process was used to explore the possibility of treating HCB. The treatment of HCB-containing wastewater by direct Fenton and anodic electro-Fenton (EF-Feox) method were carried out in this comparative study. The removal efficiency of HCB increased with the dosage of H_2O_2, but too much dosage would increase the operation costs. The effect of initial pH values, dosages of H_2O_2 and reaction time on the removal efficiency by both the direct Fenton and EF-Feox were compared. Both HCB removal methodologies follow pseudo-first-order decay kinetics. The operating costs for the studied treatments were evaluated and compared. The Fenton reagent was found to be the cheapest way to remove HCB. The results showed that HCB was removed more efficiently in EF-Feox system. HCB was removed by 96.96% with the EF-Feox method while 55.10% removal was observed by Fenton method.