MORE IN Environmental Engineering 2
VTU Civil Engineering (Semester 7)
Environmental Engineering 2
December 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

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.
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.
10 M

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