| Title |
Characterization of Organic Material Removal and Sludge Settling Using Aerobic Granular Activated Sludge |
| Authors |
이희자 ( Lee Hui Ja ) ; 김광수 ( Kim Gwang Su ) |
| Keywords |
Granular Sludge; Settleability; Aerobic Granules; Upflow Reactor |
| Abstract |
In this study, organic material removal and the settleability of granular sludge on operating conditions were investigated. The removal rate of SS and COD reached to 95% and 87% respectively at recycle rate of 100, HRT of 2.1hr and organic loading rate of 0.9 ㎏/㎥·day. The COD removal rate of granular sludge linearly increased with the increase of the influent COD concentration. As compared to activated sludge flocs, aerobic granulation significantly improves the settleability of sludge. so the SVI decreased from initial 220㎎/L to 59㎎/L. Low pH and high DO concentration lead to the formation of stable aerobic granules in aerobic upflow reactor. During the early stages of granule formation, a high exopolymer production was observed, which would promote the initial cell flocs. It was concluded that the advantages of aerobic granules can be seen as good settling ability, high retainable biomass concentration and ability to withstand high organic loading rate. |