| Title |
Effect of Dissolved Oxygen on the Removal of Nitrogen and Phosphorus in a SBR Process |
| Authors |
이재우 ; 정태학 ( Jae Woo Lee ; Tai Hak Chung ) |
| Abstract |
Effect of Dissolved Oxygen(DO) on the treatment efficiency of wastewater in the Sequencing Batch Reactor(SBR) process was investigated. The peak DO level was maintained below 1㎎O₂/L or above 6㎎O₂/L during the oxic period. Despite low D0, the organic removal efficiency was higher than 95%, but the nitrification was considerably inhibited. This resulted in significant increase in the phosphorus release and improvement of phosphorus removal efficiency. Biological phosphorus removal was accelerated by high organic loading. Large amounts of phosphorus were released during the idle period although there was no influent. When nitrate was used instead of ammonia as a nitrogen source, phosphorus release decreased because of phosphorus uptake at the later part of anoxic period. Polyhydroxyalkanoates(PHA) stored in the cell responded well in accordance with organic availability and phosphorus transport. It is possible to achieve high removal of organic and phosphorus by operation of the reactor at low DO. |