NPTEL Wastewater Treatment And Recycling Week 5 Assignment Solutions
NPTEL Wastewater Treatment And Recycling Week 5 Assignment Answer 2023
1.
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2. Which of the given treatment stages is NOT included in the preliminary treatment of wastewater:
a. Oil and greases are removed by skimming tanks
b. Suspended matters are removed by sedimentation tank
c. Floating materials are removed by screening
d. Grit and sand are removed by grit chambers
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3. Which of these units has a detention period of the order of 1 min:
a. Grit Chamber
b. Primary Sedimentation
c. Secondary Sedimentation
d. Aeration Tank
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4. Which of the following could be an appropriate velocity through the screens?
a. 0.08 m/s
b. 0.8 m/s
c. 8 m/s
d. 80 m/s
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5. The equalization tank is used to:
a. Eliminate variation in flow-rate
b. Improve performance of downstream processes
c. Balance fluctuating concentrations in the influent
d. All of the above
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6.
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7. Settling velocity under flocculent settling 15:
a. Same as under discrete settling
b. Lower than the discrete settling
c. Higher than the discrete settling
d. Could be lower or higher than the discrete settling
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8. The zone located at the bottom of a rectangular sedimentation basin 15:
a. Inlet Zone
b. Outlet Zone
c. Settling Zone
d. Sludge Zone
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9. The tube and plate settlers compared with conventional sedimentation tank, generally require
a. Lesser area but higher input energy
b. More area but lower input energy
c. More area and higher input energy
d. Lesser area and lower input energy
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10.
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11. Surface loading rate of a settling basin is 18 m’ hr/m?. Approximately, what percent of the particles that have a settling velocity of 0.006 m/sec will be removed?
a. 40 %
b. 60 %
c. 80 %
d. 100 %
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12. The terminal settling velocity of a 0.01 mm diameter spherical particle with specific gravity 2.65, in water of density 998.2 kg/m and dynamic viscosity 1.002 × 10-3 Ns/m?, would be:
a. 90 cm/s
b. 9 cm/s
c. 0.09 cm/s
d. 0.009 cm/s
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13. A circular primary clarifier is to be designed at an overflow rate of 40 m/day to treat 500C m/day of wastewater flow. The approximate diameter of the tank should be:
a. 12.6 m
b. 20 m
c. 28.2 m
d. 36.5 m
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14. The headloss through a bar rack with an approach velocity of 0.70 m/s and velocity through the screen of 1.05 m/s, will be:
a. 30 mm
b. 45 mm
c. 60 mm
d. 75 mm
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15. A grit chamber, with a detention time of 40 seconds is treating a wastewater flow of 8,000 m3day, with a flow-through velocity of 0.3 m/s. The length of the grit chamber would be:
a. 7.2 m
b. 10 m
c. 12 m
d. 18.6 m
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