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Answer any four
1 (1)
The 3 days 20°C of domestic sewage is 400 mg/l. Estimate the 5 days BOD at 20°C. Assume value of k20=0.1/day(base e).
4 M
1 (2)
State the significance of BOD in waste water treatment.
4 M
1 (3)
Name the two factors used as criteria for selection of pipe diameter and slope in design of sewer.
4 M
1 (4)
Define Noise and explain why it should be regarded as an environmental pollutant.
4 M
1 (5)
Enumerate the various sources of air pollution.
4 M
2 (1)
What are traps, and why are they provided? How can the water seal in traps be broken? What methods are to be employed to maintain the seal?
10 M
2 (2)
Explain the various sewer appurtenances used in the sewerage system.
10 M
3 (1)
Explain in detail the dilution method of disposal of sewage. State the oxygen sag curve.
10 M
3 (2)
Differentiate between aerobic and anaerobic treatment of sewage giving major end products. Name one treatment method in each category.
10 M
4 (1)
Calculate the discharge of 1.25m circular sewer laid at a slope of 1 in 360, when it is running half full. Assume n in Manning's formula as 0.011.
10 M
4 (2)
Draw a flow diagram of an activated sludge plant for the treatment of sewage. Discuss the role of return sludge.
10 M
5 (1)
Design a septic tank for a hostel of 250 inmates with average daily sewage flow of 120 liters per head. Detention period is 30 hours. Cleaning interval is 6 months. Draw a neat sectional sketch showing all details.
12 M
5 (2)
Discuss the stage of biological action constituting sludge digestion.
8 M
6 (1)
Define sludge bulking and explain causes of sludge bulking.
8 M
6 (2)
Determine the size of a high rate trickling filter for the following data
sewage flow =4 MLD . Recirulation ration=1.3 BOD of raw sewage=300 mg/l
BOD removal in Primary tank=25% final effluent BOD desired=30 mg/l
sewage flow =4 MLD . Recirulation ration=1.3 BOD of raw sewage=300 mg/l
BOD removal in Primary tank=25% final effluent BOD desired=30 mg/l
12 M
7 (1)
Explain the causes, effects and control measures of Air pollution.
10 M
7 (2)
Explain factors affecting self purification of stream.
10 M
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