Influence of the Dissolution Laws of N, P on the Activated Sludge by Ozone Oxidation

The high sludge production has becoming one of the main drawbacks in the conventional activated sludge process. The ozone oxidation is considered as one of the most effective techniques owing to its high efficiency and non-secondary pollution. In this paper, the solubilization rules of nitrogen and phosphorus with directing injection ozone in a static unit were studied, then, the long-term removal rates of ammonia nitrogen and total phosphorus in SBR system of directing injection ozone were studied with ozone dosage from 0.01～0.04gO3/gSS. The results of static experiments showed that the nitrate concentration increased quickly from 3.52mg/L to 13.83mg/L, the concentration of organic nitrogen and ammonia increased slightly, whereas, the nitrite concentration decreased gradually at the ozone dosage of 0～0.15gO3/gSS, most of the nitrogen released from the ozonated sludge were escaped from the supernate in the form of nitrogen and ammonia. The result of long-time experiment in SBR system showed that the removal rates of ammonia and total phosphorus was 91.1%, 80.5%, respectively.