Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2171303 Industrial Water Pollution And Control Previous Question Paper
Page 1 of 2
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2171303 Date: 19/11/2018
Subject Name: Industrial Water Pollution & Control
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.
Q.1 (a) Write down various sources & sinks for Dissolved Oxygen (DO) in river. 03
(b) List various benefits to industry for pollution abatement & explain intangible
benefits with examples.
04
(c) Write a short note on ?Stratification of lake? with neat figure. 07
Q.2 (a) Under which scenario authority shall allow industry for on land disposal? 03
(b) Explain various challenges of Common Effluent Treatment Plants (CETPs). 04
(c) A municipal wastewater treatment plant discharges 1.5 m
3
/s of treated effluent
having ultimate BOD of 80 mg/L & Dissolved oxygen of 2.5 mg/L into Green
river. The river has a flow of 9.1 m
3
/s, ultimate BOD of 7 mg/L & dissolved
oxygen of 8.5 mg/L. Assume a complete & instantaneous mixing. At 20 ?C
saturated DO concentration of green river is 9.1 mg/L. Estimate the following
1. Initial DO deficit
2. If the river has a constant velocity of 0.4 m/s, Estimate BOD of the stream
at distance 20 kms down stream. (Assume kd = 0.2 day
-1
)
07
OR
(c) A degradable material with the first order decay constant value of 2.5 year
-1
enters a lake with a volume of 4000 x 10
6
m
3
. The inflow quantity is 1500 x 10
6
m
3
/year with a concentration of degradable material 30 mg/L. Estimate a
concentration in the lake at steady state & at the end of half years. Also
determine its effective residence time at the steady state. Assume that initial
concentration of degradable material in lake is 1.0 mg/L.
07
Q.3 (a) Explain the need of Equalization in wastewater treatment. 03
(b) Draw an Effluent Treatment Plant (ETP) flow diagram for treatment of Starch
effluent.
04
(c) Name major methods of neutralization for both acid and alkaline wastes & explain
any one in detail.
07
OR
Q.3 (a) Explain the need of Proportioning in wastewater treatment. 03
(b) Draw an Effluent Treatment Plant (ETP) flow diagram for treatment of Fertilizer
industry.
04
(c) What is Strength Reduction? Enlist the different techniques of Strength Reduction
& explain strength reduction by equipment modification with appropriate
examples.
07
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Page 1 of 2
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2171303 Date: 19/11/2018
Subject Name: Industrial Water Pollution & Control
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.
Q.1 (a) Write down various sources & sinks for Dissolved Oxygen (DO) in river. 03
(b) List various benefits to industry for pollution abatement & explain intangible
benefits with examples.
04
(c) Write a short note on ?Stratification of lake? with neat figure. 07
Q.2 (a) Under which scenario authority shall allow industry for on land disposal? 03
(b) Explain various challenges of Common Effluent Treatment Plants (CETPs). 04
(c) A municipal wastewater treatment plant discharges 1.5 m
3
/s of treated effluent
having ultimate BOD of 80 mg/L & Dissolved oxygen of 2.5 mg/L into Green
river. The river has a flow of 9.1 m
3
/s, ultimate BOD of 7 mg/L & dissolved
oxygen of 8.5 mg/L. Assume a complete & instantaneous mixing. At 20 ?C
saturated DO concentration of green river is 9.1 mg/L. Estimate the following
1. Initial DO deficit
2. If the river has a constant velocity of 0.4 m/s, Estimate BOD of the stream
at distance 20 kms down stream. (Assume kd = 0.2 day
-1
)
07
OR
(c) A degradable material with the first order decay constant value of 2.5 year
-1
enters a lake with a volume of 4000 x 10
6
m
3
. The inflow quantity is 1500 x 10
6
m
3
/year with a concentration of degradable material 30 mg/L. Estimate a
concentration in the lake at steady state & at the end of half years. Also
determine its effective residence time at the steady state. Assume that initial
concentration of degradable material in lake is 1.0 mg/L.
07
Q.3 (a) Explain the need of Equalization in wastewater treatment. 03
(b) Draw an Effluent Treatment Plant (ETP) flow diagram for treatment of Starch
effluent.
04
(c) Name major methods of neutralization for both acid and alkaline wastes & explain
any one in detail.
07
OR
Q.3 (a) Explain the need of Proportioning in wastewater treatment. 03
(b) Draw an Effluent Treatment Plant (ETP) flow diagram for treatment of Fertilizer
industry.
04
(c) What is Strength Reduction? Enlist the different techniques of Strength Reduction
& explain strength reduction by equipment modification with appropriate
examples.
07
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Q.4 (a) Enlist sources & effects of oil pollution. 03
(b) Give difference between standards & criteria. 04
(c) Discuss ? Why an authority is more concerned about pollution caused by an
industry?
07
OR
Q.4 (a) List various methods for treatment of Strong industrial wastewaters. 03
(b) Give difference between Effluent standards & stream standards & also write India
has adopted which type of standards.
04
(c) Write a short note on ?Basic water quality parameters required for boiler feed
water and cooling water.?
07
Q.5 (a) Explain importance to draw water balance diagram for any industry. 03
(b) Write down objectives of Common Effluent treatment Plant(CETP). 04
(c) Draw butter manufacturing process diagram, indicate wastewater generation
sources in same diagram & explain reuse & recycle potential of wastewater.
07
OR
Q.5 (a) Discuss points to be considered while select ?Sewer? as ultimate point of
disposal.
03
(b) Explain the method for determination of ?Euphotic Zone ?in lake. 04
(c) Draw manufacturing process diagram of Textile industry, identify various sources
of wastewater generation in the same & suggest appropriate treatment flow
diagram to achieve effluent standards.
07
*************
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This post was last modified on 20 February 2020