Abstract: In order to further reduce the pollution load of the wastewater from the production of tobacco sheet
through the papermaking process，the ozone oxidation catalyzed by Ti(Ⅳ) is used to treat the secondary biologically-treated effluent of paper-making tobacco sheet wastewater，and the effects of such technological conditions as catalyst dosage，ozone mass concentration，pH value and temperature on the efficiency of the wastewater treatment are investigated． The results show that (1) during the wastewater treatment through the ozone oxidation catalyzed by Ti(Ⅳ)，the COD degradation reaction conforms to the second-order kinetics equation; (2) the addition of Ti(Ⅳ) increases the kinetic rate constant of the reaction，and it plays an important role in the degradation of organic substances in the wastewater; (3) under the conditions of a pH value of 8. 0，a Ti(Ⅳ) dosage of 0. 4 mmol/L，a O₃ concentration of 14. 76 mg/L and a temperature of 30 ℃，the COD and color removal rates after a 60 min reaction respectively reach 67% and 98%; and (4) the COD removal rate is 24% higher than that through the single ozone oxidation． IR and UV spectra analyses indicate that the ozone oxidation catalyzed by Ti(Ⅳ) is effective in degrading the recalcitrant organic compounds in the paper-making tobacco sheet wastewater，which include lignin degradation products and such nitrogen compounds as nicotine，and thus greatly reduces the pollution load of the treated wastewater． XRD analysis demonstrates that the ozone oxidation catalyzed by Ti(Ⅳ) causes TiO₂ ，cal-cium carbonate and magnesium carbonate to form in the paper-making tobacco sheet wastewater，which increases the removal effect of the pollutants in the wastewater．

Key words: paper-making tobacco sheet, wastewater, ozone, catalysis, titanium, tertiary treatment, recalcitrant pollutant