Abstract：Papermaking black liquor was treated in WAO process with uniform design method. The regression equations on CODCr, absorbance and turbidity were obtained by data regressions, and each regression equation was significant; Oxygen partial pressure showed the greatest impact on each indicator of papermaking black liquor. In the WAO reaction process, reaction temperature, oxygen partial pressure, influent pH value, influent concentration, stirring intensity and reaction time were researched, and the optimized six factors operating conditions were ordinally 180℃, 3.0MPa, 7.25, 5500mg/L, 500r/min, 60min. In these optimized operating conditions, for the papermaking black liquor, CODCr and CODCr removal rate were respectively 1661mg/L and 69.8%, and the absorbance and decolorization rate were respectively 0.63 and 96.3%, and the turbidity and turbidity removal rate were respectively 661NTU and 74.8%. Uniform design method got a better application in papermaking black liquor teeatment with WAO method.
