Table 6-2.
Summary characteristics of the activated sludge process variations
Food/Micro-
Overal1
BOD
organism
Mixed Liquor
Volume Loading Ratio (F/M)
Suspended
Removal
Process
lb BOD/1,000
Efficiency,
lb BOD/lb
Solids (MLSS)
Detention
Variation
cu ft/day
MLVSS/day
Time, hr
mg/L
percent
Comments
20-40
Conventional
0.2-0.5
4-8
85-95
1,000-3,000
(plug flow)
50-120
Completely-
0.2-0.6
85-95
3,000-6,000
3-6
Mixed
Step Aeration
0.2-0.4
2,000-3,500
85-95
3-6
50-60
0.2-l.5a
Contact
80-90
60-75
0.2-0.6
1,000-3,000;
3-6b
Stabilization
4,000-8,000
18-36
75-90
3,000-6,000
Extended Aeration
0.05-0.2
10-25
1-10
85-95
4,000-8,000
0.3-1.0
100-250
Pure Oxygen
System
a
Contact Unit.
b
Stabilization unit.
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