Influence of Reaction Pressure on Papermaking Black Liquor Treatment with Wet Oxidation Method

Abstract

The papermaking black liquor of one Paper Mill in ChaoZhou, GuangDong Province was treated with the wet oxidation method and the influence on treatment effect with the reaction pressure was researched. Experimental results showed that the papermaking black liquor was treated by the wet oxidation method; the treatment effect was showed upward trend with the increase of the reaction pressure, and the reaction pressure of 3.5 MPa is appropriate. The papermaking black liquor was treated by the wet oxidation method, the influent pH about 8.00 showing weakly alkaline basically. The decolorization removal and turbidity removal first increases and then slightly decreases basically with the increase of reaction time.When the reaction time is 60 min, the treatment effect is overall best. The decolorization removal can reach 61.1 % and the turbidity removal can reach 73.8 %.