JNTU Kakinada B-Tech 4-1 ENVIRONMENTAL ENGINEERING – II R13 March 2018 Question Paper

IV B.Tech I Semester Supplementary Examinations, February/March ? 2018
ENVIRONMENTAL ENGINEERING ? II (Civil Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define the terms health and sanitation and discuss their relationship. [4]
b) Write about type of pumps and assess their suitability in sewerage system. [4]
c) Explain the need for sampling and analysis of sewage. Suggest important
parameters.
[4]
d) With sketch, briefly explain the functioning of RBC. [4]
e) What is meant by Nitrification and denitrification? [3]
f) Discuss the role of sludge thickening in sludge handling. [3]

PART ?B (3×16 = 48 Marks)2. a) Estimate the Design peak flow of sewage and storm water flow in m
3
/sec for the
given conditions: Area: 3Sq Km, Density of population: 250 per Hectare. Per
capita water supply: 120lpcd Assume suitable data.

[8]
b) Write about the importance of sewer appurtenances in a Sewerage system.
Mention them and indicate their role.
[8]

3. a) Enumerate the role of pumping stations in sewerage system. Also mention the
factors to be considered in location the pumping station.
[8]
b) Write about the importance of house plumbing. [8]

4. a) Define the terms: BOD, COD, and TOC. Discuss their importance in Sewage
Treatment.
[8]
b) Develop a mathematical model for BOD (first order) and discuss the factors that
influence BOD.
[8]

5. a) Discuss the principle of Activated Sludge process. Also state different
modifications of Activated Sludge Process.
[8]
b) Estimate the volume of Aeration Tank of Activated Sludge Process along with
mechanical aerators capacity with the following Data: BOD
5
@20
o
C-250mg/l,
MLSS-3000mg/l, F/M rato-0.20 and Flow ? 10MLD.

[8]

6. a) Explain the working of UASB with sketch. Also mention problems associated
with UASB.
[8]
b) What is a septic tank? Design a two stage septic tank with soak pit disposal for
200 persons. Draw the sketch indicating the important components like inlet and
outlet. Water supply may be assumed as 90 lpcd.

[8]

7. a) Explain the basic mechanism of functioning of Anaerobic Digester with neat
sketch.
[8]
b) Describe the thickening and dewatering in sludge handling. Draw the sketch of
sludge drying bed.
[8]
Code No: RT41011
Set No. 1
R13
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