GTU Civil Engineering (Semester 6)
Water & Waste Water Engineering
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 (a) Discuss different water sources for water supply in a town? Draw a complete flow diagram of water supply scheme.
7 M
1 (b) Draw a complete flow diagram of Wastewater Treatment plant and describe the function of its each unit.
7 M

2 (a) Describe different types of screens and design a Intake fitted with coarse screen for a flow of 0.1 cumecs.
7 M
2 (b) How the diameter of rising main is determined? Give the step wise procedure for finding BHP of centrifugal pumps
7 M
Write short notes on
2 (c) i) Factors affecting sludge digestion
4 M
2 (c) ii) Types of settling phenomena
3 M

3 (a) Explain the theory of sedimentation and prove that settling velocity does not depend upon depth of sedimentation tank.
7 M
Write short notes on
3 (b) i) SOR and WOR
4 M
3 (b) ii) Types of coagulants.
3 M
3 (c) What are different types of water demands? Describe any three methods of Population forecasting.
7 M
3 (d) What is clariflocculator? Design a clariflocculator for out flow of 250 m3/hr. Assume suitable data as per manual.
7 M

4 (a) Explain the theory of filtration and troubles in RSF. Design a RSF for getting out flow of 0.2 cumecs.
7 M
4 (b) Describe different layout of distribution network systems and discuss their merits and demerits.
7 M
4 (c) Enumerate different sewer appurtenances and describe man hole with sketch.
7 M
4 (d) Describe different hydraulic characteristics of circular sewer in running full and partial full conditions.
7 M

5 (a) What is HRTF? Determine the size of HRTF for flow of 4.5 Mld. If recirculation ratio = 1.4, BOD of wastewater =250 mg/l and final effluent desired = 50 mg/l.
7 M
5 (b) What are biological processes? Differentiate suspended growth process and attached growth Process.
7 M
5 (c) How is recirculation done in activated sludge process? Draw a flow diagram of waste water treatment using ASP.
7 M
5 (d) Design a septic tank with soak pit for 100 users.
7 M



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