GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (OLD) EXAMINATION - WINTER 2018
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Subject Code:160604 Date: 30/11/2018Subject Name: Water & Waste Water Engineering
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Enlist different types of water demand. Explain the different factors affecting the water demand. 07
(b) Enlist different methods of population forecast. Explain any three methods in detail. 07
Q.2 (a) Explain the factors affecting the site selection for an intake structure. 07
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(b) Draw the layout of a water treatment plant. Explain function of each unit. 07OR
(b) What are the different types of pipes used for water supply? Discuss, Cast iron pipes and Concrete pipes in details. 07
Q.3 (a) Enlist various sewer appurtenances and write short note on any one. 07
(b) What do you understand by a trickling filter? Explain with the help of a neat sketch, the biological process involved in working of a trickling filter. 07
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ORQ.3 (a) What is meant by activated sludge? Describe with sketches the treatment of sewage by activated sludge process. Mention the advantages and disadvantages of this system. 07
(b) Draw the neat sketch of a clariflocculator and show its various parts. 07
Q.4 (a) How will you find out optimum dose of Alum? Explain the experiment in detail. 07
(b) Explain daily variation of sewage-flow. How will you estimate the wastewater discharge for design of a wastewater treatment plant? 07
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ORQ.4 (a) Write short notes on: 07
(1) Methods of disinfection (ii) Distribution networks
(b) Why biological treatment is necessary? Differentiate suspended growth process and attached growth process. 07
Q.5 (a) Draw a complete flow diagram of wastewater treatment plant and describe the function of its each unit. 07
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(b) Compare Slow Sand Gravity Filter and Rapid Sand Gravity Filter. 07OR
Q.5 (a) Explain design criteria for plain sedimentation tank. 07
(b) Explain zeolite process for water softening with its merits and demerits. 07
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