Activated Sludge Process Control Parameters

When operating an activated sludge process, the operator must be familiar with the many important process control parameters that must be monitored frequently and adjusted occasionally to maintain optimal performance.

TABLE 15.1 ACTIVATED SLUDGE MODIFICATIONS

Conven

Contact

Extended

Oxidation

Parameter

tional

Stabilization

Aeration

Ditch

Aeration time (hr)

4-8

0.5-1.5 (contact) 3-6 (reaeration)

24

24

Settling time (hr)

2-4

2-4

2-4

2-4

Return rate

25-100

25-100

25-100

25-100

(% of influent flow)

MLSS (mg/L)

1500-4000

1000-3000, 3000-8000

2000-6000

2000-6000

Dissolved oxygen (mg/L)

1-3

1-3

1-3

1-3

SSV30 (ml/L)

400-700

400-700 (contact)

400-700

400-700

F/M ratio

02-0.5

0.2-0.6

0.05-0.15

0.05-0.15

(lb BOD5/lb MLVSS)

(contact)

MCRT

5-15

20-30

20-30

(whole system, days)

% Removal BOD5

85-95%

85-95%

85-95%

85-95%

% Removal TSS

85-95%

85-95%

85-95%

85-95%

Primary treatment

Yes

No

No

No

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