Research on the Stability of Pd-Catalysts Based on the Treatment of Refractory Biodegrading Organic Wastewater

Abstract

The non-homogeneous CWAO method was used to treat refractory biodegrading organic wastewater. The re-usability of Pd-catalyst was investigated. The pH and decolorization rate of waste-waters were used as evaluation indexes. The results showed that the pH of waste-water did not change obviously in the first, second and third use of catalyst. The absorbance difference between the second and third use of catalyst waste-waters is approximately equal, but they are both larger than that of the first use and smaller than that of blank waste-waters. The decolorization rate of the first use is obviously higher than that of the second and third use, and the second use is higher than that of the third use, but the difference is not great, which shows that the catalyst has good re-usability. Compared with the last application of catalyst, the decolorization rate of waste-water decreased 3.8% and 1.6% respectively in the second and third application. Pd-Fe-Co-Ce/FSC (ratio 1:1:1:3) catalyst has good catalytic stability.