Abstract
In the nitrogen and phosphorus removal of domestic sewage, anoxic-oxic (AO) and anaerobicanoxicoxic (AAO) processes are the most widely used processes, but the insufficient carbon source will affect their efficiency. In order to study the changes of nitrogen and phosphorus removal by AO and AAO processes under the changing carbon/nitrogen (C/N) ratio, we built a simulated sewage treatment experimental device to continuously treat real domestic sewage with different carbon source content. By measuring the index of pollutants, the removal rate of each pollutant and the total removal amount of pollutants in each reaction zone were calculated and compared. The results show that the nitrogen removal effect of AAO process is better than that of AO process at higher carbon to nitrogen ratio, and the other way is that AO process is better. The comparison of phosphorus removal effect under different carbon and nitrogen ratio is that AAO process is more dominant. The application conditions and stability of the two processes for nitrogen and phosphorus removal are different, which has certain guiding significance for the actual wastewater treatment.
Published Version
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