MU Civil Engineering (Semester 6)
Environmental Engineering - 1
May 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 (1) Explain the importance of environmental sanitation.
4 M
1 (2) Explain food chain and food web in relation to ecology.
4 M
1 (3) Explain the principle of sedimentation.
4 M
1 (4) Define potable water and state different types of pollution.
4 M
1 (5) State the significance of residual chlorine in drinking water. Explain the test performed in the laboratory for determining residual chlorine.
4 M

2 (1) A rectangular tank with length of 15 m, width of 6 m and depth 3 m into treat 2.40 × 106 MLD. Calculate (1) Detention period of tank (2) Average flow velocity through tank (3) S.O.R.
10 M
2 (2) Briefly explain the different types of disinfectants used in water treatment stating the relative merits and situation where they are most suited.
10 M

3 (1) Draw the flow sheet showing sequence of various treatment units of a typical water treatment units of a typical water treatment plant with perennial river as the source of water. List these treatment units sequentially and state the function of each unit.
10 M
3 (2) Design a rapid sand filter to treat 2.25 MLD water supply for town. Given (i) filter works for 12 hours a day (ii) rate of filtration is 1250 MI/d/ha.
10 M

4 (1) Describe the operating problems of Rapid sand filter. Explain Negative head.
10 M
4 (2) How are impurities in water classified? What are their respective causes and their effects?
10 M

5 (1) Explain various methods to control leachate.
10 M
5 (2) Explain why chlorination is considered necessary even when filtration provided. Explain break point chlorination with diagram.
10 M

6 (1) Why are coagulants required in water treatment? What factors affect the dosage of coagulant?
10 M
6 (2) Define soft water. Write down the different methods of water softening. Explain a method of softening of water for industrial use.
10 M

Write any short notes on any four of the following
7 (1) Composting
5 M
7 (2) Hazardous waste.
5 M
7 (3) Iron and Manganese removal.
5 M
7 (4) Biochemical cyties.
5 M
7 (5) Fluoridation and de fluoridation.
5 M



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