04000CE402052001

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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Eighth semester B.Tech degree examinations, September 2020
Course Code: CE402
Course Name: ENVIRONMENTAL ENGINEERING - II
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Define the term population equivalent. (2)
b) List and explain the factors affecting storm water flow. (3)
c) A city has a projected population of 60,000 spread over an area of 50 hectare. (10)
Assume rate of water supply of 250 litres per capita per day, and out of this total
supply only 75 % reaches in sewer as wastewater. Assume a peak factor of 1.5.
Design a separate circular sewer line running half full. Consider Manning’s
rugosity coefficient of n = 0.012, and gradient of sewer S = 0.0001.
2 a) Define self- cleansing velocity and explain its significance. (4.5)
b) Explain the classification of sewers according to the material. (3)
c) Explain the working of an automatic flushing tank with neat sketch. (7.5)
3 9) Discuss the three systems of sewerage adopted in practice. (9)
b) Differentiate between dry weather flow and wet weather flow. (2)
©) Determine ultimate first stage BOD for a wastewater having 5 day BOD at 20" (4)
as 160 mg/l. Assume deoxygenation constant at 20°C as 0.2 per day.
PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.
4 a) Discuss in detail the zones of pollution in a river or stream. (8)
b) Compare the disposal by dilution and disposal by land treatment. (5)
© What is meant by rotating biological contactor? (2)
5 a) List and explain any five factors affecting self-purification capacity of a stream. (7.5)
b) Explain grit chamber with the help of a neat sketch. (4)
c) Write notes on activated sludge process. (3.5)
6 a) Discuss the working of intermittent sand filter. (2)
b) Explain the features and operation of contact beds with neat sketch. (8)
c) Explain streeter phelp’s equation. (5)

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