Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2161304 Biological Processes For Wastewater Treatment Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2161304 Date: 06/12/2019
Subject Name: Biological Processes for Wastewater Treatment
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) ?Value of BOD test is not reliable?, is the statement true or false? Justify
your answer
03
(b) Write a short note on bacterial growth curve with neat sketch. 04
(c) Enlist and explain factors affecting BOD test. 07
Q.2 (a) Explain with neat sketch subsurface flow system 03
(b) A sample of wastewater was incubated for 7-days at 20?C and showed a
BOD of 208 mg/L. assuming k=0.15/day calculate:
1. Its 5-day BOD
2. Ultimate BOD
04
(c) Establish Mass balance equation for CFSTR type activated sludge
process.
07
OR
(c) Determine Bio-Kinetic constants Y & Kd for following bench scale
experiment.
Sr.
No.
Influent
substrate
concentration
, mg/L
Effluent
substrate
concentration
, mg/L
Detention
Time,
day
Rector
biomass,
mg/L
1 350 12 3.8 132
2 350 20 2.6 130
3 350 34 1.8 132
4 350 60 1.3 123
5 350 70 1.2 119
07
Q.3 (a) Draw a neat sketch of UASB and highlight its components. 03
(b) Explain in brief on overland flow treatment system 04
(c) Explain the relationship between different types of bacteria present in
the anaerobic treatment.
07
OR
Q.3 (a) Draw a sketch showing 4 sequential steps in anaerobic treatment process 03
(b) Determine the volume in liters of methane gas generated per kg COD
consumed at STP
04
(c) Enlist fundamental considerations in the application of natural treatment
system. Explain effect of any three characteristics of wastewater on
natural treatment system
07
Q.4 (a) Give the difference between extended aeration and tapered aeration. 03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2161304 Date: 06/12/2019
Subject Name: Biological Processes for Wastewater Treatment
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) ?Value of BOD test is not reliable?, is the statement true or false? Justify
your answer
03
(b) Write a short note on bacterial growth curve with neat sketch. 04
(c) Enlist and explain factors affecting BOD test. 07
Q.2 (a) Explain with neat sketch subsurface flow system 03
(b) A sample of wastewater was incubated for 7-days at 20?C and showed a
BOD of 208 mg/L. assuming k=0.15/day calculate:
1. Its 5-day BOD
2. Ultimate BOD
04
(c) Establish Mass balance equation for CFSTR type activated sludge
process.
07
OR
(c) Determine Bio-Kinetic constants Y & Kd for following bench scale
experiment.
Sr.
No.
Influent
substrate
concentration
, mg/L
Effluent
substrate
concentration
, mg/L
Detention
Time,
day
Rector
biomass,
mg/L
1 350 12 3.8 132
2 350 20 2.6 130
3 350 34 1.8 132
4 350 60 1.3 123
5 350 70 1.2 119
07
Q.3 (a) Draw a neat sketch of UASB and highlight its components. 03
(b) Explain in brief on overland flow treatment system 04
(c) Explain the relationship between different types of bacteria present in
the anaerobic treatment.
07
OR
Q.3 (a) Draw a sketch showing 4 sequential steps in anaerobic treatment process 03
(b) Determine the volume in liters of methane gas generated per kg COD
consumed at STP
04
(c) Enlist fundamental considerations in the application of natural treatment
system. Explain effect of any three characteristics of wastewater on
natural treatment system
07
Q.4 (a) Give the difference between extended aeration and tapered aeration. 03
2
(b) Differentiate between Attached growth process and suspended growth
process.
04
(c) Write a short note on Rotating biological contactor with neat sketch. 07
OR
Q.4 (a) Define following terms:
1. ks 2. F/M ratio 3. SVI
03
(b) Explain in detail how nitrifying bacteria affect the BOD test result? What
should be done to overcome its effect?
04
(c) Write a mechanism of Activated Sludge with detail chemistry. 07
Q.5 (a) Give the difference between Coarse bubble and fine bubble diffused
aeration.
03
(b) Differentiate between conventional treatment system and natural
treatment system of wastewater. ( give 4 points)
04
(c) BOD results of sewage at 37
0
C
T,
day
0 1 2 3 4 5 6 7 8 9 10
Y,
mg/L
0 170 235 275 300 322 335 342 348 351 354
Determine the values of rate constant and ultimate BOD using Thomas
method.
07
OR
Q.5 (a) Differentiate between anaerobic and aerobic process. 03
(b) Highlight the points in design of rapid infiltration system. 04
(c) Explain the operational problems of conventional activated sludge
process with its occurrence and control measures.
07
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This post was last modified on 20 February 2020