STUPIDSID
1 (a)
Explain merits demerits and suitability of combined system and separate system of sewerage.
12 M
1 (b)
Differentiate between:
i) Sewage and Sullage
ii) Infiltration and exfiltration
iii) Minimum and Maximum velocities in sewers.
iv) D.W.F. and W.W.F.
i) Sewage and Sullage
ii) Infiltration and exfiltration
iii) Minimum and Maximum velocities in sewers.
iv) D.W.F. and W.W.F.
8 M
2 (a)
Explain the differences in the hydraulic design of water supply lines and sewer lines.
6 M
2 (b)
Explain the factors affecting dry weather flow.
6 M
2 (c)
Find the minimum velocity and gradient required transport coarse sand through a sewer of 60 cm diameter with sand particles of 1mm diameter and specific gravity 2.66. Assume β=0.06 and f=0.02. Assume the sewer of run half full. Take N=0.012.
8 M
3 (a)
What are sewer appurtenances? Explain wit a neat sketch, construction and working of manhole.
10 M
3 (b)
Explain the following with sketches.
i) Catch basins
ii) Oil and grease traps.
i) Catch basins
ii) Oil and grease traps.
10 M
4 (a)
Define BOD. Derive the expression for first stage BOD.
8 M
4 (b)
Write a note on carbon cycle.
4 M
4 (c)
The BOD, of wastewater has been analysed as 600 mg/L. If K1=0.23/day (base e), what is the ultimate BODu of the waste. What proportion of BODu would remain unoxidised after 20 days?
8 M
5 (a)
Explain:
i) Self-purification of stream
ii) Zones of purification
i) Self-purification of stream
ii) Zones of purification
5 M
5 (b)
Explain:
i) Sewage farming
ii) Sewage sickness
i) Sewage farming
ii) Sewage sickness
5 M
5 (c)
A stream, saturated with D.O. has a flow of 1.2 m3/sec, BOD of 4 mg/L and rate constant of 0.3 per day. It receives an effluent discharge of 0.25 m3/sec having BOD of 20 mg/L, D.O. 5 mg/L and rate constant 0.13 per day. The average velocity of flow of the stream is 0.18 m/sec. Calculate the D.O. deficit at point 20 kms and 40 kms downstream. Assume the temperature as 20°C, throughout and BOD is measured at 5 days. Take saturation D.O. at 20°C as 9.17 mg/I.
10 M
6 (a)
Draw a flow diagram of a municipal sewage treatment plant including sludge digestion. Give the removal of important polluting parameters by each of the treatment units.
10 M
6 (b)
Explain the importance of screens and types of screens in the sewage treatment process.
10 M
7 (a)
Give the comparison between conventional and high rate trickling filters.
10 M
7 (b)
Design the dimensions of a septic tank for a small colony of 150 persons provided with an assured water supply of 120 lped. Assume any data, you may need.
10 M
8 (a)
Sludge digestion tank.
5 M
8 (b)
Sampling techniques.
5 M
8 (c)
Skimming tank.
5 M
8 (d)
Reuse and recycle of sewage.
5 M
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