engineering recuitment GATE CE 2023-24 Test Series Environmental Engineering Water Treatment Sedimentation
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. The sludge produced between cleanings and the basic dimensions of the tank if the water depth just before cleaning is 3m and its length is twice its width is _______.
1
5130 kg
2
35910 kg
3
35910 g
4
51300 kg