Catalytic ozonation treatment system and method for sewage

The invention provides a catalytic ozonation treatment system for sewage. The catalytic ozonation treatment system comprises a water inlet unit, a catalytic ozonation unit, a water outlet unit and a tail gas treatment unit, wherein a water collection area, a catalytic ozonation area and a water and gas distribution area are sequentially arranged in the catalytic ozonation unit from top to bottom.The invention further provides a gas-liquid forward-flow treatment method, a gas-liquid reverse-flow treatment method and a backwashing method for catalytic ozonation of sewage. According to the catalytic ozonation treatment system and method for the sewage provided by the invention, by forming a liquid flow forward-flow path, a liquid flow reverse-flow path, a gas flow path and a backwashing path, full mixing and contact of ozone and the sewage is realized, so catalytic ozonation efficiency is improved, the ozone can be fully utilized, and no secondary pollution is generated. The system and the method is suitable for