Optimisation of the degradation of 4-nitrophenol by Fenton's process

• DOI: 10.1016/j.jwpe.2022.102685
• Publication Date: 2022-03-04T09:56:34Z
• Authors: Vanessa N. Lima; Carmen S.D. Rodri...; Yana B. Brandão; M. Benachour; Luís M. Madeira
• Keywords: Central composite design; Degradation; 4-Nitrophenol; Nitrophenol

Processes optimisation is one of the main issues to take into account for design new chemical processes applied wastewater treatment plants (WWTPs). Particularly, it can be achieved using experiments (DoE) tools, and represent progress in process performance cost reduction. In this work, an advanced oxidation (AOP), namely Fenton's process, degrade a nitrophenol model compound, i.e., 4-nitrophenol (4NP), lab-scale batch reactor. To optimise parameters (such as temperature reaction - T, initial concentrations hydrogen peroxide – [H2O2] ferrous ion [Fe2+]), DoE was applied, central composite (CCD) response surface methodology (RSM). The 4NP degradation mineralisation were evaluated outputs. maximum TOC removals (100 49.2%, respectively) non-toxic effluent (determined by inhibition Vibrio fischeri bacteria) after 60 min optimum conditions provided (T = 70.2 °C, 2.945 g/L [Fe2+] 5.9 mg/L). Some strategies, i.e. gradual addition H2O2 UV/visible radiation application, still adopted increase mineralisation. However, complete removal 80% when Fenton assisted with radiation. lumped kinetic (LKM) proposed, used first time describe reaction, described well profile residual carbon (i.e., fraction not mineralised) during these experiments.