STUPIDSID
1(a)
Explain the different types of sewerage systems with their merits, demerits and suitability.
8 M
1(b)
Explain the factors affecting dry weather flow.
6 M
1(c)
A certain district of a city has a projected population of 50,000 residing over an area of 40 hectares. Find the desired discharge for the sewerline for the following data: i) Rate of water supply = 200 lit per capita per day
ii) Average impermeability coefficient for the entire area = 0.3
iii) Time of concentration = 50 minutes. A sewerline is to be designed for a flow equivalent to the wet whether flow plus twice the DWF. Use U.S. ministry of health formulate. Assume that 75% of water supply reaches in sewer as wastewater.
ii) Average impermeability coefficient for the entire area = 0.3
iii) Time of concentration = 50 minutes. A sewerline is to be designed for a flow equivalent to the wet whether flow plus twice the DWF. Use U.S. ministry of health formulate. Assume that 75% of water supply reaches in sewer as wastewater.
6 M
2(a)
Briefly explain self cleaning velocity and non souring velocity with their values.
6 M
2(b)
Explain the desirable characteristics of a sewer material. List the sewer materials commonly used.
8 M
2(c)
A stoneware sewer 30 cm in diameter is laid at a gradient of 1 in 100 using N = 0.013 in Manning's formulac, calculate the velocity, discharge and Chagy's coefficient when the sewer is runing full.
6 M
3(a)
Explain with a neat sketch, working of deep manhole.
8 M
3(b)
Write the basic principles of home drainage systems.
6 M
3(c)
Write a note on sewer ventilation and cleaning of sewers.
6 M
4(a)
Explain different types of sampling .
6 M
4(b)
Write note on nitrogen cycle.
6 M
4(c)
Define BOD and COD. Determine ultimate BOD for sewage having 5-day BOD at 20° C as 160 mg/1. Assume deoxygenation content as 0.2 per day.
8 M
5(a)
Briefly explain factors affecting self purification process.
8 M
5(b)
Explain with a neat sketch, the salient features of oxygen sag curve.
6 M
5(c)
Write short note on: i) Sewage sickness ii) Sewage farming.
6 M
6(a)
Explain with a flow diagram, a conventional sewage treatment plant, Discuss the function of each component.
8 M
6(b)
Explain different types of screen.
6 M
6(c)
Design a primary settling tank of rectangular shape for a town having a population of 50,000 with a watersupply of 180 litres per capita per day.
6 M
7(a)
With the help of a neat sketch, explain the working of trickling filter.
10 M
7(b)
Mention the modification of activated sludge process. Explain any two of them.
10 M
8(a)
With the help of neat sketch, explain working of sludge drying beds.
10 M
8(b)
Write short notes on: i) Mechanism of anaerobic suldge digestion.
ii) Oxidation ditches.
ii) Oxidation ditches.
10 M
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