Wastewater Treatment And Reuse 1 Question Paper

Wastewater Treatment And Reuse 1

Course:Bachelor Of Science (Water & Environmental Engineering)

Institution: Kenyatta University question papers

Exam Year:2008

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2008/2009
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE (WATER ENGINEERING)
SET 426: WASTEWATER TREATMENT AND REUSE I

DATE: Monday 24th November, 2008

TIME: 8.00 a.m. – 10.00 a.m.

INSTRUCTIONS
This paper contains FIVE questions. Attempt THREE questions only.

Question 1
(a)
Describe the principles involved in the design and construction of:
(i)
Imhoff tank
(ii)
Septic tank
[10 marks]
(b)
Water is flowing at 4.5 million litres per day from a primary clarifier to a standard rate trickling filter. The 5-day BOD of the influent is 160mg/l. The organic loading and surface loading for the wastewater are 160g/m3. day and 200l/m2.day, respectively.
(i)
Determine the volume of the filter and its depth
(ii)
Calculate the efficiency of the filter unit.
[10 marks]

Question 2
(a)
Discuss how a standard rate trickling filter differs from a high rate trickling filter. [10 marks]
(b)
Differentiate between aerobic and unaerobic treatment of wastewater, giving major end products. [10 marks]

Question 3
(a)
Briefly discuss the advantages and disadvantages of using standard trickling filters as a means of treating wastewater. [10 marks]
(b)
A single stage filter is to treat a flow of 3.79 million litres per day of raw wastewater with BOD of 240mg/l. The design is for a loading of 11086kg of BOD in the raw wastewater per hectare metre, and the recirculation ratio is 1. What will be the strength of the effluent? Assume that 35% of BOD is removed in the primary clarifier. [10 marks]

Question 4
What is activated sludge? Describe with aid of sketches the treatment of wastewater by activated sludge process. Mention the advantages and disadvantages of this process. [20 marks]

Question 5
The contaminants in wastewater are removed by physical, chemical and biological means. Discuss. [20 marks]

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