A rectangular settling basin has a depth of 3 m, a length of 40 m and a width of 6 m.The water treated in the basin has a flow rate of 500 L/s and contains 50 mg/L of typea particles, 100 mg/L of type b particles and 180 mg/L of type c particles (particletype letters refer to the particles listed in problem 1). What is the suspended solidsconcentration in the effluent from the settling basin? Determine the overall percentremoval of suspended solids from the water achieved by the settling basin.

To find the suspended solids concentration in the effluent from the settling basin, we need to…

Answered: A rectangular settling basin has a…

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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A waste sludge flow of 40 m³/day is gravity thickened in a circular tank with a diameter of 6.8 m. The solids concentration is increased from 4.5% to 7.5% with 85% suspended- solids capture. Calculate the solids loading in kg/m² d and the quantity of thickened sludge in m³/d.
Settling tank has a depth of 3 m and surface area of 900 m2 is used to remove particles of size 0.01 mm and specific gravity 2.65. Compute the removal percentage of the tank for the discharge of 8000 m3/d. Take viscosity of water equal to 10-3 kg/m.s.
Environment.civil.
A rectangular sedimentation tank following coagulation- Exa 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.
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
sluage system. (ii) The treated effluent containing grit particles from the above (i) activated sludge system is discharged into a secondary clarifier for further treatment. Assume that a spherical body undergoes settling through the clarifier with a terminal settling velocity of 2 m/s. Find the drag force on the grit particle due to the fluid. Assume that Stokes law is valid and dynamic of viscosity of effluent = 0.001 radius of spherical particle = 2 mm). In addition, outline two (2) purposes of the phi factor in particle settling? Kgm ¹s
(ii) The treated effluent containing grit particles from the above (i) activated sludge system is discharged into a secondary clarifier for further treatment. Assume that a spherical body undergoes settling through the clarifier with a terminal settling velocity of 2 m/s. Find the drag force on the body due to the fluid. Assume that Stokes law is valid and dynamic of viscosity of effluent = 0.001 Kgm-¹s-1, radius of spherical object = 2 mm)
Gave wrong values earlier. These are the correct values A settling tank having a depth of 3.5 m and surface area of 1000 m2 is used to remove particles of size 0.01 mm and specific gravity of 2.6. Calculate the removal percentage of the tank for the discharge of 7000 m3/d. Take viscosity of water as 1.1x10-3 kg/m.s.
A complete-mixed activated sludge process (CMAS) is to be designed to treat 6.0 MGD of primary effluent having a BOD5 of 190 mg/L. The requirement is that the effluent BOD5 and TSS concentrations be 20 mg/L or less on an annual average basis. The following biokinetic coefficient obtained at 15°C: Y = 0.6 mg VSS/mg BOD5, k = 2.85 d-1, Ks = 70 mg/L BOD5, and kd = 0.041 d-1. Assume that the MLVSS concentration in the aeration basin is maintained at 2,500 mg/L. Determine: a. The minimum MCRT (d) b. The MCRT necessary to meet the requirement (d) c. The volume of the aeration basin (ft3)
A settling tank having a depth of 3.5 m and surface area of 1000 m2 is used to remove particles of size 0.01 mm and specific gravity of 2.7. Calculate the removal percentage of the tank for a discharge of 7000 m3/d. Take viscosity of water as 10-3 kg/m.s.

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