The degradation of printing and dyeing wastewater by manganese-based catalysts.

Printing and dyeing wastewater generally has high pH, high turbidity, poor biodegradability, complex composition, and high chroma, which make it one of the most difficult industrial wastewaters to treat. Herein, heterogeneous ozone oxidation technology is applied to oxidize and degrade printing and dyeing wastewater. A metal oxide catalyst supported on activated carbon (γ-MnO/AC) was prepared by hydrothermal synthetic method and shown to enable synergistic catalysis involving MnO metal sites and N/C sites.