A H1040 Pages: 2

Reg No.:_ Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
EIGHTH SEMESTER B.TECH DEGREE EXAMINATION, MAY 2019

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 8) Sullage b)Sewagec)Storm water 0) Night soil (4)
b) Explain Time of concentration (3)

c) Determine the size of circular sewer for a discharge of 700105 running half full. (8)

Assume i=0.0001 and n=0.015

2 a) Discuss the merits & demerits of separate and combined system of sewage (8)
b) Discuss the purposes served by an inverted siphon with help of a neat sketch. (5)
c) Explain the term relative stability. (2)
3 ஐ Definea)BOD b)COD (4)
b) Explain physical characteristics of sewage (6)

०) The 5 day BOD of a sewage sample is 150 നള. Determine its 3 days 20°C BOD. 6)

Assume deoxygenation constant at 20°C as 0.1

PART B
Answer any two full questions, each carries 15 marks.

4 a) Give the flow diagram of a conventional municipal wastewater treatment. (3)
b) A city discharges 100 m/s of sewage into a river, which is fully saturated with (12)

oxygen flowing at the rate of 1500 m*/s and with a velocity of 0.2 m/s. The 5 days

BOD of sewage at the given temperature is 250 mg/l. Find when and where the

critical D.O deficit will occur in the downstream portion of the river and what is

its amount? Assume coefficient of purification of the stream (f) as 4 and

coefficient of deoxygenation as 0.1.

5 9) Explain sludge volume index. (5)

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