Sludge Treatment by O-3/H2O2 and Carbon Source Recovery

摘要

Proper disposal of excess sludge has become a tough problem faced by most of wastewater treatment plants. In order to solve this problem, an advanced sludge treatment process combining hydrogen peroxide and ozone was proposed. The impacts of pH value, ratio of hydrogen peroxide to ozone and the original sludge concentration were investigated. As a result, the combination of hydrogen peroxide and ozone process was efficient for sludge disintegration. The optimum molar ratio of hydrogen peroxide to ozone was 1.2 and the pH value was 6. The increase of sludge initial concentration was beneficial for sludge disintegration. The ideal initial concentration of sludge was 9900 mg/L similar to 19600 mg/L. In addition, experimental results also proved that the hydrolysis of sludge could be used as carbon source for nitrogen removal. The average denitrification rate in sludge solution was 2.08 mgNO(3)-N/g MLSS.h which was 78% of methanol.