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Name
Reg No
A
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
07 THRISSUR CLUSTER
SECOND SEMESTER M.TECH. DEGREE EXAMINATION APRIL 2018
Civil Engineering
(Environmental Engineering)
07CE 6102
BIOLOGICAL METHODS IN ENVIRONMENTAL ENGINEERING
Time 3 hours
Max.Marks: 60
Answer all six questions. Part of each question is compulsory.
Answer either part or part of each question
Q.no.
Module 1
Marks
1a
Explain bacterial growth and reproduction with the help of a neat diagram.
4
Answer b or c
b
Write a note on major types of micro-organisms involved in the biological waste water treatment processes.
5
c
Explain the steps in chemo-heterotrophic bacterial oxidation with the help of stoichiometric representation.
5
Q.no.
Module 2
Marks
2a
Explain specific substrate utilization rate and derive the relation between
4
specific substrate utilization rate and mean cell residence time for a CFSTR
b
Derive an expression for net specific growth rate of micro-organism.
5
c
How will you determine the kinetic coefficients from the data containing a
5
range of effluent substrate concentrations?
Q.no.
Module 3
Marks
3a
What are the different types of reactors and also explain the factors affecting
4
the selection of a reactor?
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b
Write a note on any four types of process modifications of plug-flow model of activated sludge process.
5
c
Write a note on nutrient requirements and environmental requirements in
5
activated sludge process.
Q.no.
Module 4
Marks
4a
Differentiate between Activated sludge process and Trickling filter.
4
Answer b or c
b
Explain the significance of NRC equations and the operational troubles of Trickling filter.
5
c
Write a note on Sequencing Batch reactor.
5
Q.no.
Module 5
Marks
5a
Write a note on sludge thickening and Stabilization.
5
Answer b or c
b
Explain different types of solid separation methods used in Stabilization ponds.
7
c
Differentiate between Aerated lagoon and Stabilization pond.
7
Q.no.
Module 6
Marks
6a
Explain different types of attached growth denitrification systems.
5
Answer b or c
b
What do you mean by combined carbon oxidation nitrification process?
What are its advantages and disadvantages?
7
c
What are the effects of major operational and environmental variables on suspended-growth nitrification process?
7
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