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Homework answers / question archive / Water Treatment (CEng 5403) Assignment For Sedimentation The diameter of particles is 0

Water Treatment (CEng 5403) Assignment For Sedimentation The diameter of particles is 0

Civil Engineering

Water Treatment (CEng 5403)

Assignment For Sedimentation

  1. The diameter of particles is 0.1 mm of specific gravity 2.5. Find the settling velocity of the particles at 10oC. The kinematic viscosity of water at 10oC is 31 centistokes. And find the maximum surface loading rate for removing 0.1 mm particles. (at T=10oC, ρ=999 kg/m3)

 

  1. Estimate the terminal settling  velocity in water at a temperature of 15oC of spherical silicon particles with specific gravity 40 and average diameter of (a) 0.05 mm and (b) 1.0 mm (at T=10oC, ρ=999 kg/m3 and μ=0.00113 N s/m2)

 

  1. Write a computer program which will calculate the terminal settling velocity given the diameter, SG, temperature, ρ and μ.

 

  1. Based on the settling column analysis of discrete particles the following data was obtained. The samples collected at 120 cm depth of column.

Settling time, min 

15 

30 

45 

60 

90 

180 

Weight fraction remaining 

0.95 

0.80 

0.60 

0.45 

0.25 

0.05 

Calculate the % removal of discrete particles of loading rate of 40 m3/d/m2

 

  1. The following test data were gathered to design a settling tank. The initial suspended solids concentration for the test was 20.0 mg/L. determine the detention time and overflow rate that will yield 60 % removal of suspended solids. The data given are suspended solids concentrations in mg/L.

 

Depth,

*

m

 

Time of sampling, min

 

1

0

 

2

0

 

35

 

50

 

7

0

 

85

 

14.0

 

10.0

 

7.0

 

4.0

 

0.5            6.2       5.0

 

1.0          15.0     13.0     10.6     8.2       7.0    6.0

1.5          15.4     14.2     12.0     10.0     7.8    7.0

2.0          16.0     14.6     12.6     11.0     9.0    8.0

2.5          17.0     15.0     13.0     11.4     10.0    8.8

 

            *Depths from top of column, column depth = 2.5 m

  1. A water treatment plant has four clarifiers treating 4.0 mgd (0.175 m3/s) of water. Each clarifier is 4.88 m wide, 24.4 m long, and 4.57 m deep. Determine: (a) the detention time, (b) overflow rate, (c) horizontal velocity, and (d) weir loading rate assuming the weir length is 2.5 times the basin width.

 

  1. A clarifier with an area of 150 m2 treats a flow of 3000 m3/d. The water entering the clarifier contains a substantial number of clay agglomerates with a specific gravity of 1.05 and a diameter of 0.05 mm. What percentage of these particles will be removed in the clarifier?

 

  1. A flow of 1 m L/d has to be treated in a sedimentation tank with an overflow rater of <50 m3/d/m2. Design a rectangular tank of detention period of 2h and depth of tank is 3 m. L:B is 3:1. If the water contains 600 mg/L of suspended solids and 33% are settleable. Calculate the volume of sludge storage for 30 days cleaning period.

     

    AAiT

     

    Department of Civil Engineering

     

    Water Treatment

     

     
       

 

  1. The following test data were gathered to design a settling tank. The initial turbidity for the test was 33.0 NTU. Determine the detention time and overflow rate that will yield 88% removal of suspended solids. The data given are suspended solids concentrations in NTU.

 

 

Time, min 

 

Depth,a m  

30  

60  

90        12

1.0  

5.6  

2.0        

  0  

2.0  

11.2  

5.9  

2.6        

3.5  

14.5  

9.9  

6.6       3.0

             a Depths from top of column, column depth = 4.0 m.

  1. Design a horizontal flow rectangular sedimentation basin using high-rate settlers for a maximum day design flow rate of 25,000 m3/d. Assume a water temperature of 12oC, that the angle of the settler tubes is 60o, and that they have a hydraulic diameter of 0.05 m. Also assume the floc has excellent settling characteristics. Provide the following in your summary of the design:

Q design

Number of tanks

Width of each tank

Length of settler

Length of each tank

Side water depth Depth of sludge zone v approach

vfc: velocity in the settler

Reynolds number

Froude number

Number of launders

Launder length

Weir loading

Type of sludge collector

 
   

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