Biomedical Engineering Reference
In-Depth Information
Influent
Ana1
Ana2
Ano1
Ano2
Aer1
Aer2
Effluent
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
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Operation Time（d）
(c) SRT 15d
Figure 2. TP profiles under different SRT operations; HRT=6h.
The process performed normally when SRT was 10d, during which operation time
average COD, TN, TP removal efficiency were 64%, 65% and 84% respectively and average
effluent TP concentration was 0.8 mgL
-1
(figure 2(a)). PAO deactivation was observed when
SRT was 30d, where TP removal efficiency was down to 55% and average effluent TP
concentration was increased to 2.1 mgL
-1
(figure 2(b)), which was much higher than
discharging limit (1.0 mgL
-1
) according to
Discharging Standards for Chinese Urban WWTPs
(GB18918-2002) first grade (B). Falling temperature accounted for part of PAO deactivation
Influent
Ana1
Ana2
Ano1
Ano2
Aer1
Aer2
Effluent
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
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Operation Time（d）
(a) HRT 6h
Figure 3. Continued on next page.
