GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VI (NEW) EXAMINATION - WINTER 2020
--- Content provided by FirstRanker.com ---
Subject Code:2160604 Date:29/01/2021
Subject Name:Water & Waste Water Engineering
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
--- Content provided by FirstRanker.com ---
Q.1 (a) Draw a layout of a conventional water treatment plant. 03
(b) Differentiate between trickling filter and activated sludge unit used for 04 biological treatment of wastewater.
(c) Design a plain sedimentation tank for treating water required for a 07 town with population of 15,000 with the rate of water supply of 180 lpcd. Take peak factor as 1.8. Show necessary checks.
--- Content provided by FirstRanker.com ---
Q.2 (a) Define Intake. Give the classification of intake. 03
(b) Differentiate between 04
- Plain sedimentation and sedimentation aided with coagulation.
- Unit processes and unit operations used for wastewater treatment.
(c) Design a flash mixer for treating 8 MLD of water 07
--- Content provided by FirstRanker.com ---
Q.3 (a) Find the most economical diameter of the rising main and the BHP 03 of the pump required for pumping 10 MLD of raw water. The total head against which the pump has to work is 35 m. Distance of conveyance of water is 2 km. Take coefficient of friction=0.0075. Neglect minor losses. Assume efficiency of pump as 80%.
(b) Explain the different treatment trains adopted commonly for 04 treatment of water.
(c) Explain different types of aerators used for water treatment with neat 07 sketch.
Q.4 (a) Find out the diameter of a clarifier needed for treating 200 m3/hour 03 of flow. Assume surface loading rate as 30 m3/m2/day.
(b) Define: 1. Pre-chlorination 2. Super chlorination 3. Break point 04 chlorination 4. Plain chlorination
--- Content provided by FirstRanker.com ---
(c) Enlist different layout of water distribution network. State the 07 advantages and disadvantages of any two of them.
Q.5 (a) Explain how you will find the balancing storage requirement of a 03 distribution reservoir.
(b) Enlist different sewer appurtenances used in sewerage system. 04 Explain different components of a manhole with a neat sketch.
(c) Calculate the diameter and discharge of a circular sewer laid at a 07 slope of 1 in 400 when it is running half full, and with a velocity of 1.1 m/s. Take Manning’s N=0.012.
Q.6 (a) Draw a neat sketch of an elevated service reservoir showing all its 03 components.
--- Content provided by FirstRanker.com ---
(b) Explain different types of storm regulators used in a sewerage system. 04
(c) A trickling filter is to be designed for a town having a population of 25000 with a sewage flow of 5 07 MLD with BOD of 230 mg/l. It is to be designed for a loading rate of 10500 Kg of BOD/ha.m/day. What will be the BOD of the effluent? Take recirculation ratio as 1.0.
Q.7 (a) Why are coarse screen and grit chambers provided in the wastewater 03 treatment plant?
(b) Write a short note on soak pit. 04
(c) Why sludge digestion is required? Explain the stages of sludge 07 digestion. Enlist the factors affecting sludge digestion.
--- Content provided by FirstRanker.com ---
Q.8 (a) Explain the symbiotic relation between algae and bacteria in an 03 oxidation pond.
(b) Differentiate between suspended growth process and attached growth 04 process used for biological treatment of wastewater.
(c) Design a septic tank for a colony of 170 persons. Assume rate of 07 water supply as 120 lpcd.
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University