# Download VTU BE 2020 Jan CE Question Paper 15 Scheme 7th Sem 15CV71 Municipal and Industrial Wastewater Engineering

Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) Civil Engineering 15 Scheme 2020 January Previous Question Paper 7th Sem 15CV71 Municipal and Industrial Wastewater Engineering

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15CV71
Municipal and Industrial Wastewater Engineering
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Seventh Semester B.E. Degree Examination, Dew4?ver?T/Jan.2020
Time: 3 hrs. Max. Marks: 80
Note: 1. Answer any FIVE full questions, choosing ONE full question from each !nodule.
2. Assume any suitable missing data.
Module-I
1 a. Explain briefly the different types of sewerage system. (06 Marks)
b. Explain the various factors affecting the dry weather flow. (04 Marks)
c. The drainage area of one sector of a town is 20 hectares. The classification of the surface of
this area is as follows :
% Total surface area Type of surface Run ? off coefficient
25 Hard pavements 0.85
25 Roof surface 0.80
15 Unpaved street 0.30
25 Gardens and Lawns 0.15
10 Wooded area 0.10
If the time of concentration for the area is 30 minutes. Find the maximum run off. Use the
following formula for intensity of rainfall R = 900/(t + 60). (06 Marks)
OR
2 a. Briefly explain the essential requirements of a good sewer material. (04 Marks)
b. Explain with a neat sketch, working of an "oxidation pond". (06 Marks)
c. Explain with a neat sketch, construction and working of a manhole. (06 Marks)
Module-2
3 a. Briefly explain self cleaning velocity and non scouring velocity. (04 Marks)
b. State the hydraulic formulas for velocity which are commonly adopted in the design of
sewers. Explain any one in brief. (06 Marks)
c. A stone ? ware sewer having 30cm in diameter is laid at a gradient of 1 in 100 use N = 0.013
in Manning's formula. Calculate the velocity, discharge and Chezy's co-efficient when the
sewer is running full. (06 Marks)
OR
4 a. Explain the phenomenon of self? purification of natural streams subjected to pollution with
the help of oxygen ? sag curve indicating the salient features. (10 Marks)
b. The sewage of a town is to be discharged into a river. The quantity of sewage produced per
day is 8 million liters and its BOD is 250 mg/C. If the discharge in the river is 200 f/s and if
its BOD is 6mg/C, find the B.O.D of the diluted water. (06 Marks)
Module-3
5 a. Write the flow diagram employed to treat municipal waste water and indicate the importance
of each treatment unit. (08 Marks)
b. With a neat sketch, explain the working of a grit chamber and skimming tank. (08 Marks)
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USN
Nt \\. (?

cc7
/
6
) -`4";e
15CV71
Municipal and Industrial Wastewater Engineering
??t
LIBRAR
Y

cs .,?

CHIKOC?
r /i e
Seventh Semester B.E. Degree Examination, Dew4?ver?T/Jan.2020
Time: 3 hrs. Max. Marks: 80
Note: 1. Answer any FIVE full questions, choosing ONE full question from each !nodule.
2. Assume any suitable missing data.
Module-I
1 a. Explain briefly the different types of sewerage system. (06 Marks)
b. Explain the various factors affecting the dry weather flow. (04 Marks)
c. The drainage area of one sector of a town is 20 hectares. The classification of the surface of
this area is as follows :
% Total surface area Type of surface Run ? off coefficient
25 Hard pavements 0.85
25 Roof surface 0.80
15 Unpaved street 0.30
25 Gardens and Lawns 0.15
10 Wooded area 0.10
If the time of concentration for the area is 30 minutes. Find the maximum run off. Use the
following formula for intensity of rainfall R = 900/(t + 60). (06 Marks)
OR
2 a. Briefly explain the essential requirements of a good sewer material. (04 Marks)
b. Explain with a neat sketch, working of an "oxidation pond". (06 Marks)
c. Explain with a neat sketch, construction and working of a manhole. (06 Marks)
Module-2
3 a. Briefly explain self cleaning velocity and non scouring velocity. (04 Marks)
b. State the hydraulic formulas for velocity which are commonly adopted in the design of
sewers. Explain any one in brief. (06 Marks)
c. A stone ? ware sewer having 30cm in diameter is laid at a gradient of 1 in 100 use N = 0.013
in Manning's formula. Calculate the velocity, discharge and Chezy's co-efficient when the
sewer is running full. (06 Marks)
OR
4 a. Explain the phenomenon of self? purification of natural streams subjected to pollution with
the help of oxygen ? sag curve indicating the salient features. (10 Marks)
b. The sewage of a town is to be discharged into a river. The quantity of sewage produced per
day is 8 million liters and its BOD is 250 mg/C. If the discharge in the river is 200 f/s and if
its BOD is 6mg/C, find the B.O.D of the diluted water. (06 Marks)
Module-3
5 a. Write the flow diagram employed to treat municipal waste water and indicate the importance
of each treatment unit. (08 Marks)
b. With a neat sketch, explain the working of a grit chamber and skimming tank. (08 Marks)
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15CV71
OR
6 a. Explain with a neat sketch, the working principles of a trickling filer. (08 Marks)
b. Briefly explain the terms : i) Suspended growth ii) Activated sludge
iii) Sludge digester iv) Sequential batch reactors. (08 Marks)
Module-4
7 a. Explain the effects of effluent discharge on the stream water quality. (08 Marks)
b. What is meant by strength reduction? Explain the various methods of strength reduction
being adopted in the industries. (08 Marks)
OR
8 a. List and explain the methods of removal of colloidal solids from wastewater. (08 Marks)
b. Explain the principles of raw and partially treated wastes before discharged into streams.
(08 Marks)
Module-5
9 a. With the help of a flow diagram, explain the treatment units suggested to treat wastewater
from a tanning industry along with wastewater characteristics. (08 Marks)
b. State the sources and characteristics of the wastewater from dairy industry. (08 Marks)
OR
10 a. With the help of a line diagram, explain the process of paper and pulp industry highlighting
the sources of wastewater generation. (08 Marks)
b. Discuss the characteristics and treatment of waste water from a pharmaceutical industry.
(08 Marks)
* k n 4,1
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