A Study of Refractory Industrial Wasteawater Treatment by Fe/C Microelectrolysis Combining with Multiphase Fluid Catalytic Oxidation

Abstract

Refractory industrial wastewater used to be high strength in diversified organic pollution and biotoxicity. It is becoming a formidable global environmental issue. This study revealed a novel process of Fe/C microelectrolysis combining with multiphase fluid catalytic oxidation to treat high strength industrial wastewater (take pharmaceutical wastewater as an example). Different catalysts were investigated to optimize the operation parameters. The results showed that the average COD removal rate of single microelectrolysis in pharmaceutical wastewater was 23.1%. After microelectrolysis treatment, the B/C was improved from 0.11 to 0.23. The PVA pellets were set as the fluidized catalysts with activated carbon (AC), TiO2 and MnO2, respectively. The AC, TiO2 and MnO2 could significantly promote the COD degradation of pharmaceutical wastewater. When combining with multiphase fluid catalytic oxidation, the PVA/MnO2 indicated a higher COD removal efficiency of 51.6% with 0.4%H2O2 addition, the effluent B/C was 0.34.