3.2.4. The study of Fenton reaction kinetics
To simplify the kinetics model, some assumptions were given as follows. They included that the solution was non-compressed and the major oxidation action was attributed to the HOradical dot which could be consumed quickly and completely. In addition, the concentrations of H2O2 maintained invariable due to its over-abundance [23]. Therefore, the kinetics of COD removal for antibiotic fermentation wastewater in Fenton system followed pseudo-first order reaction (Eq. (3)).