The characteristics of primary and secondary settling units of activated sludge process is given below. Design a gravity thickener for the combined mixture of sludge from both tanks. Assume the solid loading rate is 40 kg / m².d. The specific gravity of combined sludge is 1.02 and provide two circular thickeners. Type of sludge Primary settling unit Secondary settling unit Specific gravity (assumed) 1.03 1.005 Solid % 2.5 0.6 Flow rate (m'id) 140 350

The characteristics of primary and secondary settling units of activated sludge process is given below. Design a gravity thickener for the combined mixture of sludge from both tanks. Assume the solid loading rate is 40 kg / m².d. The specific gravity of combined sludge is 1.02 and provide two circular thickeners. Type of sludge Primary settling unit Secondary settling unit Specific gravity (assumed) 1.03 1.005 Solid % 2.5 0.6 Flow rate (m'id) 140 350

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Chapter2: Loads On Structures

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Question

The characteristics of primary and secondary settling units of activated sludge process is given below. Design
a gravity thickener for the combined mixture of sludge from both tanks. Assume the solid loading rate is 40 kg /
m².d. The specific gravity of combined sludge is 1.02 and provide two circular thickeners.
Type of sludge
Primary settling unit
Secondary settling unit
Specific gravity (assumed)
1.03
1.005
Solid %
2.5
0.6
Flow rate (m'id)
140
350

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