| Title |
A Comparison of Nutrient Removal Characteristics between (AO)2 SBBR and A2O SBBR |
| Authors |
박영식 ( Young Seek Park ) ; 김동석 ( Dong Seog Kim ) |
| Keywords |
(AO)2 sequencing batch biofilm reactor; A2O sequencing batch biofilm reactor; Biological nutrient removal; DO; pH |
| Abstract |
This study was carried out to compare the performance of two types of sequencing batch biofilm reactors (SBBRs), anoxic-oxic-anoxic-oxic (AO)2 SBBR and anoxic-oxic-anoxic A2O SBBR, on the biological nutrient removal. The TOC removal efficiency in A2O SBBR was higher than that in (AO)2 SBBR. At the 1st non-aeration period, the release of PO4(3-)-P in A2O SBBR was higher than that in (AO)2 SBBR because of the high TOC removal. At the 1st aeration-period, the nitrification was not completed in (AO)2 SBBR, however, it was completed in A2O SBBR and the nitrification rate in A2O SBBR was higher than that in (AO)2 SBBR. The release and uptake of PO4(3-)-P in A2O SBBR was much higher than in (AO)2 SBBR. Also, the profiles of DO and pH in reactors were used to monitor the biological nutrient removal in two SBBRs. The break point in DO and pH curves at the aeration period coincided with the end of nitrification. |