 MORE IN Environmental Engineering 1
VTU Civil Engineering (Semester 6)
Environmental Engineering 1
June 2014
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) Discuss the environmental pollution due to human activities.
6 M
1 (b) What is meant by per capita demand? List and discuss the factors that affect the per capita demand.
6 M
1 (c) The following is the population data of a city available from past census records. Determine the future population of the city in 2030 by i) Arithmetical increase method and ii) Geometrical increase method.
8 M

2 (a) What are the intake structures? Explain the factors to be considered while selecting a location for intake structures?
6 M
2 (b) What are the factors affecting selection of a particular type of pump?
6 M
2 (c) Water has to be supplied to a town with one lakh population at the rate of 150 litres per capita per day from a river 1500m away. The difference in elevation between the lowest water level in the sump and the reservoir is 28m. If the demand has to be supplied in 8 hours. Determine the size of the main and the brake horse power of the pumps required. Assume maximum demand as 1.5 times the average demand. Assume f=0.0075, Velocity in the pipe 2.4m/sec and efficiency of pump 80 percent.
8 M

3 (a) Mention the permissible limits for the following parameters and explain the environmental significance of each: Hardness, Nitrate, Fluorides and Iron.
8 M
3 (b) Write a note on properties of whole some water.
6 M
3 (c) Briefly explain the water borne diseases and their control.
6 M

4 (a) Give complete sequence of a water treatment plant with a flow diagram and mention the function of each treatment unit.
8 M
4 (b) Explain with chemical equations, what happens when alum is added to water?
6 M
4 (c) The maximum daily demand at a water purification tank plant is 8 MLD. Design the dimensions of a suitable rectangular sedimentation tank for the raw water supplies. Take detention time period of 4 hours and the depth of 3.0mts. The velocity of flow is 20 cm/min.
6 M

5 (a) Explain in detail the theory of filtration.
8 M
5 (b) Explain with a neat sketch working of a pressure filters?
6 M
5 (c) Determine the dimensions of a set of rapid gravity filters for treating water required for a population of 50,000 with average rate of demand as 180 litres per day person. Assume a peak factor of 1.8 by ignoring wash water requirements. Assume rate of filtration is 500l/sq.m.
6 M

6 (a) Explain the terms pre-chlorination, post-chlorination, Break point chlorination and Super chlorination.
8 M
6 (b) Chlorine usage in the treatment of 20,000 cubic meter per day is 8kg/day. The residual after 10min contact is 0.20mg/l. Calculate the dosage in milligrams per litre and chlorine demand of the water.
6 M
6 (c) Briefly explain Zeolite process of hardness removal.
6 M

7 (a) What is meant by de-fluoridation? Explain with a line diagrams the 'Nalagonda technic' of defluoridation.
6 M
7 (b) What is aeration? Explain the type of acrators.
6 M
7 (c) Describe the various methods of distribution of water and discuss the advantages and disadvantages of each.
8 M

Write explanatory notes with sketch on the following:
8 (a) Fire hydrant.
5 M
8 (b) Air valves.
5 M
8 (c) Sluice valves.
5 M
8 (d) Pressure relief valves.
5 M

More question papers from Environmental Engineering 1