Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2161306 Design Of Water Treatment Units Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
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.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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.
Ca
+2
=75 mg/L Mg
+2
=40 mg/L Na
+
= 10 mg/L
SO4
-2
=109 mg/L Cl
-
=10 mg/L HCO3
-
=300 mg/L.
07
Q.2 (a) Determine the headloss for clean and 60 percent clogged screen for following
conditions:
V = 0.9 m/s; v = 0.6 m/s; open area for flow through clear bar screen = 0.19 m
2
;
Cfor clean = 0.7 and Cfor 60% clogged = 0.6
03
(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
(c) 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
(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
(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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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
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.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
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.
Ca
+2
=75 mg/L Mg
+2
=40 mg/L Na
+
= 10 mg/L
SO4
-2
=109 mg/L Cl
-
=10 mg/L HCO3
-
=300 mg/L.
07
Q.2 (a) Determine the headloss for clean and 60 percent clogged screen for following
conditions:
V = 0.9 m/s; v = 0.6 m/s; open area for flow through clear bar screen = 0.19 m
2
;
Cfor clean = 0.7 and Cfor 60% clogged = 0.6
03
(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
(c) 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
(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
(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
2
Q.4 (a) Write a short note on Demineralization Plant. 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
(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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This post was last modified on 20 February 2020