Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2161306 Design Of Water Treatment Units Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161306 Date:18/05/2019
Subject Name: Design of Water Treatment Units
Time:10:30 AM TO 01:00 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 treatment flow diagram for the ground water having considerable
amount of iron and manganese.
03
(b) Define the following terms:
(i) Velocity Gradient (ii) Rapid Mix
(iii) water treatment plant residuals (iv) Tappered flocculation
04
(c)
Explain the important points of consideration while designing water treatment
scheme for any city.
07
Q.2 (a)
Write down the design criteria for Screen.
03
(b) The design flow for a water treatment plant is 3.8x10
3
m
3
/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
i) the quantity of alum needed on a daily basis in kg/day
ii) the dimension of the tank in meter for a tank with equal length, width
& depth
iii) the power input required for a G of 900 sec-1 in KW.
04
(c)
Make a list of various flow measuring devices used in water treatment plant and
explain any one in detail with neat diagram.
07
OR
(c)
Explain the various surface water treatment scheme with proper flow diagram.
07
Q.3 (a) The average flow rate at a small municipal treatment plant is 20000
m
3
/day. Determine the dimension and detention time of rectangular
primary clarifier with a channel width of 6m. Assuming SOR is
40m
3
/m
2
.day. Width to Depth ration is 1.5.
03
(b) Compare circular and rectangular sedimentation tank. According to you
which one is more favorable? Justify your answer.
04
(c) Assuming all the suitable data design a tube settler for the flow of 10MLD. 07
OR
Q.3 (a) 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.
03
(b) 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.
04
(c) Assuming all the suitable data design a clariflocculator for the flow of 5
MLD.
07
Q.4 (a) 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.
03
(b) Make a list of various auxiliary necessary for disinfection and state the
application of each.
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161306 Date:18/05/2019
Subject Name: Design of Water Treatment Units
Time:10:30 AM TO 01:00 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 treatment flow diagram for the ground water having considerable
amount of iron and manganese.
03
(b) Define the following terms:
(i) Velocity Gradient (ii) Rapid Mix
(iii) water treatment plant residuals (iv) Tappered flocculation
04
(c)
Explain the important points of consideration while designing water treatment
scheme for any city.
07
Q.2 (a)
Write down the design criteria for Screen.
03
(b) The design flow for a water treatment plant is 3.8x10
3
m
3
/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
i) the quantity of alum needed on a daily basis in kg/day
ii) the dimension of the tank in meter for a tank with equal length, width
& depth
iii) the power input required for a G of 900 sec-1 in KW.
04
(c)
Make a list of various flow measuring devices used in water treatment plant and
explain any one in detail with neat diagram.
07
OR
(c)
Explain the various surface water treatment scheme with proper flow diagram.
07
Q.3 (a) The average flow rate at a small municipal treatment plant is 20000
m
3
/day. Determine the dimension and detention time of rectangular
primary clarifier with a channel width of 6m. Assuming SOR is
40m
3
/m
2
.day. Width to Depth ration is 1.5.
03
(b) Compare circular and rectangular sedimentation tank. According to you
which one is more favorable? Justify your answer.
04
(c) Assuming all the suitable data design a tube settler for the flow of 10MLD. 07
OR
Q.3 (a) 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.
03
(b) 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.
04
(c) Assuming all the suitable data design a clariflocculator for the flow of 5
MLD.
07
Q.4 (a) 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.
03
(b) Make a list of various auxiliary necessary for disinfection and state the
application of each.
04
2
(c)
Write down detailed note on the process of Coagulation & Flocculation with neat
diagram.
07
OR
Q.4 (a) Why it is necessary to prepare plant layout before the actual construction
phase of water treatment plant.
03
(b) State the basic principle involved in Reverse osmosis process and state
the design procedure for it.
04
(c) Design a RSF unit to treat the flow of 500 m3/hr. 07
Q.5 (a) Write a brief note on defloridation process for water. 03
(b) Make a list of various methods available for softening & explain any one
in brief.
04
(c)
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/l respectively.
CO2 = 10mg/l Ca+ + = 100 mg/l Mg+ + = 13 mg/l Na+ = 12 mg/l Alkalinity
= 180 mg/l SO-4= 118.56 mg/l Cl-= 18.46 mg/l.
07
OR
Q.5 (a) Write a brief note on Multimedia filters. 03
(b)
?Why hydraulic profile of treatment plant is necessary?? Explain in detail.
04
(c) Enlist & explain various unit operations &/or processes which can be used
for the processing of water treatment plant residuals.
07
*************
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This post was last modified on 20 February 2020