Biomedical Engineering Reference
In-Depth Information
Influent
Ana1
Ana2
Ano1
Ano2
Aer1
Aer2
Effluent
12.0
10.0
8.0
6.0
4.0
2.0
0.0
12345678910111213141516171819202122
Operation Time(d)
(b) HRT 18h
Influent
Ana1
Ana2
Ano1
Ano2
Aer1
Aer2
Effluent
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
1 2 3 4 5 6 7 8 9 10111213141516171819202122
Operation Time(d)
(c) HRT 9h
Figure 3. TP profiles under different HRT operations; SRT=15d.
since operation temperature during SRT=30d was lower than that of during SRT=10d (15°C
vs. 18°C). Considering average operation temperature was only 13 when SRT=15d but TP
removal efficiency was up to 67% and average effluent TP concentration was decreased to
1.4 mgL -1 (figure 2(c)) , SRT was the main factor that cause PAO deactivation in figure 2(b).
PAO deactivation was observed when HRT=18h with effluent TP 2.3mgL-1 and TP
removal efficiency 49% (figure 3). Since atmosphere temperature was even higher when
HRT=18h than that when HRT=6h in this group of operations (15.6 vs. 13 ), HRT was
the main factor that causes PAO deactivation in figure 3(b). Anaerobic phosphorus release
was less than 4mgL-1 in both figure 2 and figure 3 because of limited COD content in the
influent.
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