Download GTU BE/B.Tech 2019 Summer 6th Sem New 2161306 Design Of Water Treatment Units Question Paper

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Subject Code:2161306

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-VI(NEW) - EXAMINATION - SUMMER 2019

Subject Name: Design of Water Treatment Units

Time:10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q1

1. Draw the treatment flow diagram for the ground water having considerable amount of iron and manganese. (MARKS 03)
2. Define the following terms: (MARKS 04)
   1. Velocity Gradient

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   2. Rapid Mix
   3. Water treatment plant residuals
   4. Tapered flocculation
3. Explain the important points of consideration while designing water treatment scheme for any city. (MARKS 07)

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Q2

1. Write down the design criteria for Screen. (MARKS 03)
2. The design flow for a water treatment plant is 3.8x10³ m³/day. The rapid mixing tank will have a mechanical mixtures and the average alum dose will be 30mg/l. the hydraulic detention time of the tank will be 1 min. determine (MARKS 04)
   1. the quantity of alum needed on a daily basis in kg/day
   2. the dimension of the tank in meter for a tank with equal length, width & depth
   3. the power input required for a G of 900 sec^-1 in KW.

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3. Make a list of various flow measuring devices used in water treatment plant and explain any one in detail with neat diagram. (MARKS 07)

OR

1. Explain the various surface water treatment scheme with proper flow diagram. (MARKS 07)

Q3

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1. The average flow rate at a small municipal treatment plant is 20000 m³/day. Determine the dimension and detention time of rectangular primary clarifier with a channel width of 6m. Assuming SOR is 40m³/m².day. Width to Depth ration is 1.5. (MARKS 03)
2. Compare circular and rectangular sedimentation tank. According to you which one is more favorable? Justify your answer. (MARKS 04)
3. Assuming all the suitable data design a tube settler for the flow of 10MLD. (MARKS 07)

OR

1. Determine the power requirement to achieve a G value of 100/sec in a mixing basin with a volume of 2800m³. Assuming the assuming dynamic viscosity of water at 15C is 1.139x10^-3 N.s/m². (MARKS 07)

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Q4

1. Enlist the various treatment units which can be used for the removal of suspended & colloidal particles from water. State the advantage & disadvantages of any one. (MARKS 03)
2. Assuming all the suitable data design a clariflocculator for the flow of 5 MLD. (MARKS 04)
3. A water treatment plant having the capacity to treat a maximum flow of 0.25 m³/day. Calculate the approach velocity for a screen chamber having length of 5 m. depth =0.5m & width to depth ratio is 2. (MARKS 07)

OR

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1. Why it is necessary to prepare plant layout before the actual construction phase of water treatment plant. (MARKS 03)
2. State the basic principle involved in Reverse osmosis process and state the design procedure for it. (MARKS 04)
3. Design a RSF unit to treat the flow of 500 m³/hr. (MARKS 07)

Q5

1. Write a brief note on defloridation process for water. (MARKS 03)

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2. Make a list of various methods available for softening & explain any one in brief. (MARKS 04)
3. The water with the following chemical composition has to be softened using lime-soda process. Calculate the quantities of chemicals required to treat 300m³/h of water. Practical limits of removal for CaCO₃ & Mg (OH)₂ are 30 & 10mg/1 respectively. (MARKS 07)
   CO₂ = 10mg/l Cat⁺⁺=100mg/l Mg^{+ +}=13 mg/l Na⁺= 12 mg/l Alkalinity =180 mg/l SO-4=118.56 mg/l Cl-= 18.46 mg/l.

OR

1. Write a brief note on Multimedia filters. (MARKS 03)

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2. “Why hydraulic profile of treatment plant is necessary?” Explain in detail. (MARKS 04)
3. Enlist & explain various unit operations &/or processes which can be used for the processing of water treatment plant residuals. (MARKS 07)

Date:18/05/2019

Total Marks: 70

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