Average R% = 45.7
0
200
400
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1000
1200
1400
1600
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2000
2200
2400
2600
2800
3000
1
2
3
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10 11 12 13
Day
[COD] (mg/L)
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
% Removal
Crude
PST Effluent
% removal
Fig. 12.3 COD concentration in crude sewage and the effluent after pre-sedimentation tank (PST)
and percentage removals of COD. (Reproduced from Jiang et al. 2018)
Average R% = 40.1
0
100
200
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600
700
800
4
5
6
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Day
[BOD] (mg/L)
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
% Removal
Crude
PST Effluent
% removal
Fig. 12.4 BOD concentration in crude sewage and the effluent after pre-sedimentation tank (PST)
and percentage removals of BOD. (Reproduced from Jiang et al. 2018)
12 Field Study III: Evidence Gained from Site Studies for the. . .
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