Continuous heterogeneous Fenton type process for dye pollution abatement intensified by hydrodynamic cavitation.

GABRIEL SALIERNO; STEFANIA NAPOLEONE; M. AGUSTINA MAISTERRENA; MIRYAN C. CASSANELLO; MAXIMILIANO PELLASIO; LUCILA INES DOUMIC; M. ALEJANDRA AYUDE

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

AMER CHEMICAL SOC

Lugar: Washington; Año: 2021

0888-5885

The heterogeneous Fenton-type process was investigated in a continuous Upflow-Fixed-BedReactor (UFBR) of a nano-Prussian Blue catalyst supported on γ-alumina beads. Temperatureand oxidant concentration strongly increased dye discoloration and total organic carbon (TOC)conversion. The long-term stability of the catalyst was confirmed. The best performance wasfound with a residence time of 2 minutes at 353 K and an inlet hydrogen peroxide concentrationtwice the stoichiometric one required for mineralization, attaining complete discoloration and 45% TOC conversion. The formed reactive species continued the reaction after leaving the UFBR.Hydrodynamic cavitation (HC) of the collected outlet stream led immediately to completediscoloration and doubled the TOC conversion in 40 minutes. Short-chain carboxylic acidsaccounted for about 70% of the remaining TOC. The UFBR in-series with the HC reactor led tocomplete discoloration and intensified the TOC conversion. The subsequent HC step thoroughlyconsumed the remnant oxidant, increasing its efficiency.