In order to solve the biologically pretreated coal gasification wastewater (CGW) still contained a large number of toxic and refractory compounds, posing great hazard to the environment, sludge based activated carbon was prepared from the sewage sludge produced during gasification wastewater (CGW) treatment via the loading process of manganese and ferric oxides (main Mn₃O₄ and Fe₃O₄, loading dose of 15.52% and 7.45%, respectively), and the zone catalysts exhibited a specific surface area of 327.5 and 339.1 m² / g.Pilot-scale tests demonstrated that the additive of the prepared catalysts significantly improved the removal efficiency of pollutants during ozonation treatment, with an effluent COD, TOC, total phenols and NH₄⁺ -N concentrations of 41-43, 19-20, 0.6-0.9 and 4.3-4.5 mg / L, respectively, can meet class-I criteria of the Integrated Wastewater Discharge Standard.Moreover, utilization rate of ozone with catalysts additive (1.24 mg / mg) increased 40% as compared with the test only with ozone additive, would significantly save the operation cost.In comparison with the fresh catalysts, COD removal efficiency only decreased by 5.2% after 50th successive catalytic ozonation.The cost of catalysts production was about 5 000 RMB / t average.Overall, efficient, stable, economical and sustainable characteristics of the prepared catalysts made it suitable for advanced treatment of CGW.