| Abstract:The thermal modification mechanism of attapulgite was studied by specific surface area testing, SEM analysis and TG analysis. The effect of calcination temperature, calcination time of the attapulgite, the initial pH value of the waste water to be tested, dosage of attapulgite and reaction time on the efficiency of advanced treatment of eucalyptus pulping wastewater was investigated. The results showed that the optimum conditions were: attapulgite calcination temperature was 400℃, calcination time was 2 h, the dosage was 50 g/L, and the reaction time was 90 min, without adjusting wastewater initial pH. CODCr removal rate could reach 59%, color removal rate could reach 84% under the conditions. |
