Biomedical Engineering Reference
In-Depth Information
mgL-1 could avoid PAO from deactivation in this study. Considering the fact that there was
almost no NO
3
-
-N detected in anaerobic reactors of the parallel AN/AO process when PAO
deactivation occurred (data not shown), and NO
3
-
-N at the beginning of anaerobic stage in
one of the PAO deactivated anaerobic-anoxic SBR run was very close to 2.3 mgL-1 (2.8
mgL-1, figure 4), ready biodegradable organic at the beginning of anoxic stages was probably
more essential to activity of PAO exposing to cyclic anaerobic-anoxic circumstances. In this
study threshold DOC content in the anoxic stage was found to be 3.0 mgL-1; varying DOC
from 3.0 mgL-1 to 0.3 mgL-1 improved effluent phosphorus concentration only from 0.7
mgL-1 to 0.2 mgL-1.
18.0
16.0
14.0
Anaerobic Phase 0th min.
Anaerobic Phase 120th min.
Anoxic Phase 0th min.
Anoxic Phase 120th min.
12.0
10.0
8.0
6.0
4.0
2.0
0.0
1
3
5
7
9 11 13 15 17 19 21 23 25 27 29 31
Operation Time（d）
(a) DOC=3.0mgL-1
20.0
18.0
16.0
14.0
Anaerobic Phase 0th min.
Anaerobic Phase 120th min.
Anoxic Phase 0th min.
Anoxic Phase 120th min.
12.0
10.0
8.0
6.0
4.0
2.0
0.0
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31
Operation Time（d）
(b) DOC=0.9mgL-1
Figure 6. Continued on next page.
