Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem New 2171306 Wastewater Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2171306 Date:27/05/2019
Subject Name: Wastewater Engineering
Time: 02:30 PM TO 05:30 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) Discuss in brief the classification of screen 03
(b) Write a short note: design of grease removal 04
(c) Discuss the operational problems of UASB reactor 07
Q.2 (a) Enlist various approaches for the design of anaerobic digestors 03
(b) Discuss the design criteria for aerated grit chamber 04
(c) Discuss with the neat sketch offline and inline equalization 07
OR
(c) Determine the volume of equalization basin from the following data of
time period vs. average flow during the time period where M = midnight
Time period M-4 4-8 8-12 12-16 16-20 20-M
Avg. flow,
cu.m/s
0.15 0.4 0.6 0.3 0.2 0.25
07
Q.3 (a) Discuss the operational problems of suspended growth process. 03
(b) Write a short note: high rate clarifier 04
(c) Write down the procedure for the design of UASB reactor 07
OR
Q.3 (a) Explain the operational problems of chemical unit processes 03
(b) Draw only a neat flow diagram of sludge drying beds 04
(c) Discuss the design of extended aeration 07
Q.4 (a) Write down the equations used for the calculation of organic loading rate
and sludge loading rate.
03
(b) Discuss the design criteria of rotating biological contactor (RBC). 04
(c) Design a suitable grit chamber to cater the need of a town having 0.2
million population with approximately 150 Litre per capita per day of
sewage contribution.
07
OR
Q.4 (a) What can be done to prevent sludge bulking? 03
(b) Enlist the various sludge handling equipments used and discuss any one in
brief
04
(c) Design a rotating biological contactor system for the flow of 5 MLD having
BOD5 of 120 mg/L. The treated effluent should meet the discharge criteria
of less than 30 mg/L of BOD5. Assume maximum permissible organic
loading rate as 0.05 kg BOD5/m
2
.d
07
Q.5 (a) Enlist various means thro? which aeration can be provided to the effluent. 03
(b) Draw only a neat sketch of Biotower 04
(c) Design a bar screen for a peak flow of 50 MLD. 07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2171306 Date:27/05/2019
Subject Name: Wastewater Engineering
Time: 02:30 PM TO 05:30 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) Discuss in brief the classification of screen 03
(b) Write a short note: design of grease removal 04
(c) Discuss the operational problems of UASB reactor 07
Q.2 (a) Enlist various approaches for the design of anaerobic digestors 03
(b) Discuss the design criteria for aerated grit chamber 04
(c) Discuss with the neat sketch offline and inline equalization 07
OR
(c) Determine the volume of equalization basin from the following data of
time period vs. average flow during the time period where M = midnight
Time period M-4 4-8 8-12 12-16 16-20 20-M
Avg. flow,
cu.m/s
0.15 0.4 0.6 0.3 0.2 0.25
07
Q.3 (a) Discuss the operational problems of suspended growth process. 03
(b) Write a short note: high rate clarifier 04
(c) Write down the procedure for the design of UASB reactor 07
OR
Q.3 (a) Explain the operational problems of chemical unit processes 03
(b) Draw only a neat flow diagram of sludge drying beds 04
(c) Discuss the design of extended aeration 07
Q.4 (a) Write down the equations used for the calculation of organic loading rate
and sludge loading rate.
03
(b) Discuss the design criteria of rotating biological contactor (RBC). 04
(c) Design a suitable grit chamber to cater the need of a town having 0.2
million population with approximately 150 Litre per capita per day of
sewage contribution.
07
OR
Q.4 (a) What can be done to prevent sludge bulking? 03
(b) Enlist the various sludge handling equipments used and discuss any one in
brief
04
(c) Design a rotating biological contactor system for the flow of 5 MLD having
BOD5 of 120 mg/L. The treated effluent should meet the discharge criteria
of less than 30 mg/L of BOD5. Assume maximum permissible organic
loading rate as 0.05 kg BOD5/m
2
.d
07
Q.5 (a) Enlist various means thro? which aeration can be provided to the effluent. 03
(b) Draw only a neat sketch of Biotower 04
(c) Design a bar screen for a peak flow of 50 MLD. 07
2
OR
Q.5 (a) Write down the major equations used for the design of Biotower 03
(b) Discuss the step by step design of SBR 04
(c) Design a conventional activated sludge system having diffused aeration for
the domestic wastewater having flow of 6300 m
3
/d, and having influent
BOD5 as 220 mg/L. Assume the removal efficiency of 30% in primary
treatment.
07
*************
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This post was last modified on 20 February 2020