STUPIDSID
Answer any four
1 (a)
An aeration tank has a MLSS concentration of 2900 mg/L. After settling for 30 minutes in one litre of graduated cylinder, the sludge is measured to be 180 ml . Calculate the SVI of the sludge. Indicate whether the volume index is good or poor.
5 M
1 (b)
Explain causes and effects of air pollution.
5 M
1 (c)
Name the two factors used as criteria for selection of pipe diameter and slope in design of sewer.
5 M
1 (d)
Define Noise and explain its effects and control measures.
5 M
1 (e)
Define sludge . What are the factor controlling digestion.
5 M
2 (a)
What are traps, and why are they provided? How can the water seal in traps be broken? What methods are to be employed to maintain the seal?
10 M
2 (b)
Explain the principle and operation of an oxidation ditch. List its merits and demerits.
10 M
3 (a)
What are the criteria to be used in deciding the material for sewer pipes?
10 M
3 (b)
Differentiate between aerobic and anaerobic treatment of sewage giving major end products. Name one treatment method in each category.
10 M
4 (a)
Calculate the discharge of 1.5m circular sewer laid at a slope of lin 380, when it is running half full. Assume n in Mannings formula as 0.012.
10 M
4 (b)
Draw a flow diagram of sewage treatment plant for a medium, sized town.
10 M
5 (a)
Design a septic tank for small colony of 500 persons with average daily sewage flow of 80 litres per head. Detention period is 24 hours. Cleaning interval is 6 months. Draw a neat sectional sketch showing all details.
12 M
5 (b)
Discuss the stage of biological action constituting sludge digestion.
8 M
6 (a)
State the merits and demerits of combined system and separate system.
8 M
6 (b)
Determine the size of a high rate trickling filter for the following data
sewage flow =8.5 MLD Recirculation ratio =1.3 BOD of raw sewage=260mg/l BOD removal in primary tank=30% final effluent BOD desired=30mg/l
sewage flow =8.5 MLD Recirculation ratio =1.3 BOD of raw sewage=260mg/l BOD removal in primary tank=30% final effluent BOD desired=30mg/l
12 M
7 (a)
Explain the operational problems in ASP and Tricking filter.
10 M
7 (b)
Explain factors affecting self purification of stream.
10 M
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