Example 9.18. A rectangular sedimentation tank following coagulation- flocculation is to treat a flow of 3000 m³ / day with a detention time of 6 hours. It is to be hand cleaned of sludge at 6 week intervals. The suspended solids concentration of the water is reduced from 250 mg|L to 5 mg/L by coagulation- flocculation. The settled sludge includes 40 mg/L (based on water flow) of metallic precipitate and has a moisture content of 85% and specific gravity of 1.24. Determine the volume of sludge produced between cleanings and the basic dimensions of the tank if the water depth just before cleaning is 3 m and its length is twice its width.

Example 9.18. A rectangular sedimentation tank following coagulation- flocculation is to treat a flow of 3000 m³ / day with a detention time of 6 hours. It is to be hand cleaned of sludge at 6 week intervals. The suspended solids concentration of the water is reduced from 250 mg|L to 5 mg/L by coagulation- flocculation. The settled sludge includes 40 mg/L (based on water flow) of metallic precipitate and has a moisture content of 85% and specific gravity of 1.24. Determine the volume of sludge produced between cleanings and the basic dimensions of the tank if the water depth just before cleaning is 3 m and its length is twice its width.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Example 9.18. A rectangular sedimentation tank following coagulation-
flocculation is to treat a flow of 3000 m³ / day with a detention time of 6 hours. It
is to be hand cleaned of sludge at 6 week intervals. The suspended solids
concentration of the water is reduced from 250 mg/L to 5 mg|L by coagulation-
flocculation. The settled sludge includes 40 mg/L (based on water flow) of
metallic precipitate and has a moisture content of 85% and specific gravity of
1.24. Determine the volume of sludge produced between cleanings and the basic
dimensions of the tank if the water depth just before cleaning is 3 m and its
length is twice its width.

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