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

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019

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Subject Code: 2161306 Date: 11/12/2019
Subject Name: Design of Water Treatment Units
Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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

Q.1 (a) Draw the neat sketch of a treatment train for a ground water source when cations concentration is high. [03]
(b) Enlist different types of Flow measuring devices for water treatment. Explain any 1 in detail. [04]
(c) Make a bar diagram in terms of CaCO3 for a water with following composition and soften the water by a suitable method and calculate the dosage of relevant chemicals.

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Ca⁺² =75 mg/L Mg⁺² =40 mg/L Na⁺ =10 mg/L
S04^2- =109 mg/L CI^-=10 mg/L HCO₃^- =300 mg/L. [07]

Q.2 (a) Determine the headloss for clean and 60 percent clogged screen for following conditions: [03]
V =0.9 m/s; v = 0.6 m/s; open area for flow through clear bar screen = 0.19 m²%;
C_{ror clean} = 0.7 and C_{ror 60% clogged} = 0.6

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(b) Write down chemical reactions involved with Alum and Ferric chloride; (i) When bicarbonate alkalinity present and (ii)) When Lime added. [04]
(c) Design a Rapid Mixer with impeller for 20 MLD flow of water. [07]

OR

Q.2 (a) Write down design criteria for tube settler. Explain the design steps for tube settler. [07]

Q.3 (a) Write a short note on layout and hydraulic profile of water treatment plant. [03]

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(b) What is Velocity Gradient? Write down the design criteria for Paddle Flocculator. [04]
(c) A coagulation-sedimentation plant clarifies 40 MLD water. The quantity of alum required at plant is 18 mg/L. If the raw water is having an alkalinity equivalent to 5 mg/L of CaCO3, determine the quantity of alum and the quick lime (containing 85 % CaO) required per year by the plant. [07]

OR

Q.3 (a) Write a short note on layout and hydraulic profile of water treatment plant. [03]
(b) The maximum daily demand at a water treatment plant has been estimated 12 MLD. Design the dimensions of a suitable sedimentation tank. Assuming detention time 6 hrs. & velocity of flow as 20 cm/min. [04]

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(c) Design a Flocculator for 20 MLD flow for water treatment plant. [07]

Q.4 (a) Write a short note on Nalgonda Technique. [03]
(b) Draw the neat diagram of slow sand filter showing all important components with proper labeling. [04]
(c) Design a chlorine contact tank for peak water flow of 20 MLD. [07]

OR

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Q.4 (a) Write a short note on Dewatering of Sludge. [03]
(b) Design tube settler module of a square cross section for design flow of 5 MLD. Assume tube cross section = 0.05 m x 0.05 m, length = 1 m and angle of inclination =60°. [04]
(c) Design a Rapid Sand Filter for a city water treatment plant for average flow of 20 MLD. [07]

Q.5 (a) Write down design criteria for Rectangular Sedimentation tank. [03]
(b) Explain iron and manganese removal from a ground water source. [04]

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(c) Write down detailed note on water treatment residuals with neat diagram showing various sources. [07]

OR

Q.5 (a) Write a short note on application of activated carbon filters in water treatment plant. [03]
(b) What are the drawbacks of single media filter? How can we overcome them? [04]
(c) Write and explain selection criteria for source of water and water treatment schemes. [07]

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