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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 What are the objectives of biological treatment? 4
Answer b or c
b Explain the role of enzymes in biological treatment. 5
c Differentiate between Attached growth and suspended growth treatment systems.
5
Q.no. Module 2 Marks
2a Explain the terms: biomass yield and observed yield. 4
Answer b or c
b Derive an expression for micro-organism concentration of a CFSTR without recycle. 5
c Explain the relation between process safety factor and minimum mean cell 5
residence time.
Q.no. Module 3 Marks
3a Explain Simplex aerator with a neat sketch. 4
Answer b or c
b Derive an expression for substrate utilization rate using MONOD'S equation. 5
c Explain the operational difficulties of ASP and remedial measures. 5
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Q.no. Module 4 Marks
4a Explain the process description of Trickling filter. 4
Answer b or c
b Differentiate between single-stage and two-stage Trickling filter. 5
c Explain the process analysis of Trickling filter with the help of Atkinson's 5
equation.
Q.no. Module 5 Marks
5a Write short notes on Wet air oxidation and Dewatering of sludge. 5
Answer b or c
b Explain the classification and design considerations of Stabilization ponds. 7
c What is meant by sludge thickening? List the various methods of sludge 7
thickening.
Q.no. Module 6 Marks
6a Explain the stoichiometry of nitrification process?
5
Answer b or c
b
Mention the various methods used for the removal of nitrogen from sewage. Discuss
in detail any one method
7
c
Explain different types of financial expenditures needed for biological treatment
systems.
7