GTU BE 6th Semester 161304 Biological Process for Wastewater Treatment Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VI (OLD) – EXAMINATION ? SUMMER 2018
Subject Code:161304 Date:03/05/2018
Subject Name:Biological Process for Wastewater Treatment
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 the experimental procedure to find the reaeration constant in the
Laboratory.
07
(b) Draw the BOD progression curve and explain the different phases of the
Same.
07

Q.2 (a) Highlight the importance of BOD for environmental engineers & explain the
factors affecting the BOD test.
07
(b) Derive the relationship to find the amount of methane per gram of COD. 07
OR
(b) Explain biochemistry of carbohydrates. 07

Q.3 (a) Explain the mechanism by which substrate removal takes place in an attached
Growth process.
07
(b) Enlist unit operations and processes used to remove constituents found in
Wastewater.
07
OR
Q.3 (a) Differentiate between;
1. Suspended Growth Process
2. Attached Growth Process.
07
(b) Describe in brief classification of biological treatment processes. 07

Q.4 (a) With the help of a neat sketch explain working of rotating biological contactor. 07
(b) Write a short note on Root Zone Treatment. 07
OR
Q.4 (a) Explain with a neat sketch the working of a percolating filter (trickling Filter).
Also explain on which principle it works.
07
(b) Explain in detail Anaerobic Sludge Digestion. 07

Q.5 (a) Discuss the fundamental considerations in the application of natural treatment
Systems.
07
(b) Differentiate between oxidation ditch & oxidation pond. 07
OR
Q.5 (a) Write down the mass balance for CFSTR without recycle and hence Derive the
equation for finding bio kinetic constant.
07
(b) Enlist and explain the special problems of waste water treatment specific to small
communities.
07
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