| Title |
Biological Nitrogen and Phosphorus Removal Characteristics on Organic Material and Nitrate Loadings in SBR Process |
| Authors |
김이태 ( I Tae Kim ) ; 이희자 ( Hee Ja Lee ) ; 김광수 ( Kwang Soo Kim ) ; 배우근 ( Woo Keun Bae ) |
| Keywords |
SBR; sequencing batch reactor; Phosphorus release and uptake; Denitrification; Anoxic condition; F/M ratio |
| Abstract |
Since anaerobic/anoxic/oxic process, which is a typical mainstream biological nitrogen and phosphorus removal process, utilizes influent organic matter as an external carbon source for phosphorus release in anaerobic or anoxic stage, influent COD/T-P ratio gives a strong influence on performance of phosphorus removal process. In this study, a bench scale experiment was carried out for SBR process to investigate nitrogen and phosphorus removal at various influent COD/T-P ratio and nitrate loadings of 23∼73 and 1.6∼14.3 g NO₃-N/㎏ MLSS, respectively. The phosphorus release and excess uptake in anoxic condition were very active at influent COD/T-P ratios of 44 and 73. However, its release and uptake was not obviously observed at COD/T-P ratio of 23. Consequently, phosphorus removal efficiency was decreased. In addition, the phosphorus release and uptake rate in anoxic condition increased as the nitrate loading decreased. Specific denitrification rate had significantly high correlation with organic materials and nitrate loadings of the anoxic phase too. The rate of phosphorus release and uptake in the anoxic condition were 0.08∼0.94 ㎏ S-P/㎏ MLSS·d and 0.012∼0.1 ㎏ S-P/㎏ MLSS·d, respectively. |