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Set 519: Industrial Waste Water Collection And Treatment Question Paper

Set 519: Industrial Waste Water Collection And Treatment

Course:Bachelor Of Science (Water & Environmental Engineering)

Institution: Kenyatta University question papers

Exam Year:2010

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2008/2009
INSTITUTE OF OPEN LEARNING (IOL)
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE
(WATER ENGINEERING)

SET 519: INDUSTRIAL WASTEWATER COLLECTION AND TREATMENT

DATE: Friday 19th February 2010

TIME: 8.00a.m – 10.00a.m

INSTRUCTIONS

This paper contains FIVE questions. Attempt THREE questions only.
Question 1
a)
Discuss in detail flexural stresses acting on a sewer pipe laid underground.

[10marks]
b)
Design an outfall circular sewer of separate system for a town with a population
of 500,000 persons with a water supply at 90 litres per head per day. The sewer
can be laid at a slope of 1 in 1000 with n = 0.012. A self-cleansing velocity of
0.80m5-1 is to be developed. The dry weather flow may be taken as 1 of the
3
maximum discharge.

[10marks]

Question 2
a)
Explain how you would test a newly laid sewer line before bringing it into
commissioning.

[10marks]
b)
Calculate the diameter and discharge of a circular sewer laid at a slope of 1 in 500
when it is running half full, and with a velocity of 2.0m5-1.

Take n = 0.015.

[10marks]

Page 1 of 2

Question 3
Describe in detail the major characteristics of industrial wastewater and the treatment
options available.

[20marks]

Question 4
a)
What is an intercepting trap, and where is it used in a building drainage system?
If such a trap is not included in a typical building drainage system, what are the
problems associated with its absence?

[5marks]
b)
A 200 mm diameter sewer is to flow at 0.4 depth on a grade ensuring a degree of
self-cleaning equivalent to that obtained at full depth at velocity of 0.75m5-1.
Find the required grade and associated velocity and rate of discharge at this depth.
Assume Manning’s rugosity coefficient n as 0.012. The variation of n with depth
may be neglected.

[15marks]

Question 5
In detail, describe the various stages followed in the construction of sewers.

[20marks]

Page 2 of 2

Set 519: Industrial Waste Water Collection And Treatment Question Paper

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