How to determine the needed surface area of the secondary clarifier tank given that the flow is 40,000 m3 per day and the recycling ratio is 0.5 . The necessary solids concentration in the underflow is 13,000 mg/L, while the Mixed liquor suspended solids concentration in the activated sludge is 4,500 mg/L. The table below shows the settling properties of sludge: Mixed liquor suspended solids Mg/l Settling velocity m/hr 2000 6 4000 3 6000 1 8000 0.2 10000 0.1 13000 0.1

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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How to determine the needed surface area of the secondary clarifier tank given that the flow is 40,000 m3 per day and the recycling ratio is 0.5 . The necessary solids concentration in the underflow is 13,000 mg/L, while the Mixed liquor suspended solids concentration in the activated sludge is 4,500 mg/L.

The table below shows the settling properties of sludge:

Mixed liquor suspended solids

Mg/l

Settling velocity

m/hr

2000

6

4000

3

6000

1

8000

0.2

10000

0.1

13000

0.1

 

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