STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Discuss the different systems of sewerage commonly used in India with their relative merits and demerits.
6 M
1 (b)
Write a short note on pumping of sagave.
4 M
1 (c)
Give the physical, chemical and biological characteristics of domestic sewage from urban area.
6 M
2 (a)
Design a sewer for a population of 100,000 with a water supply of 140 lit/capita/day; 75% of that resulting in sewage. The sewer is laid at a slope of 1 in 625 and is designed to carry 3 times D. W. F. when running full. Find the diameter and the velocity of flow in the sewer. Assume N = 0.012 in the meanings formula.
8 M
2 (b)
b) Explain the following terms:
i) Self cleansing velocity.
ii) Variations in sewage flow.
iii) Hydraulically equivalent sections
iv) Effect of change of life on Sewage quality.
i) Self cleansing velocity.
ii) Variations in sewage flow.
iii) Hydraulically equivalent sections
iv) Effect of change of life on Sewage quality.
8 M
Answer any one question from Q3 and Q4
3 (a)
Draw a figure showing different zones of stream pollution and discuss in detail about zone of active decomposition.
6 M
3 (b)
Discuss the river classification in per MEF.
4 M
3 (c)
Write Streeter-Phelps equation and explain the meaning each term involved in it.
6 M
4 (a)
Enlist velocity control devices in grit chamber. Explain any one of them in detailed with sketch.
8 M
4 (b)
Design the screen chamber of an ETP to treat a peak flow of 40 MLD of sewage.
Assume inclination of bars 45?with horizontal, Size of bars: 10 mm × 60 mm; 10mm dimension facing the flow, clear spacing between bars as 50 mm and the velocity through the screen as 0.8 m/sec at peak flow.
Assume inclination of bars 45?with horizontal, Size of bars: 10 mm × 60 mm; 10mm dimension facing the flow, clear spacing between bars as 50 mm and the velocity through the screen as 0.8 m/sec at peak flow.
8 M
Answer any one question from Q5 and 6
5
Explain the following modifications of the activated sludge process with necessary flow diagrams and clearly differentiate them from the conventional activate sludge process:-
i) Tapered Aeration.
ii) Step Aeration.
iii) Extended Aeration.
iv) Modified Aeration.
i) Tapered Aeration.
ii) Step Aeration.
iii) Extended Aeration.
iv) Modified Aeration.
18 M
6 (a)
Design a single stage high rate trickling filter for treatment of mixed waste water comprising domestic sewage and industrial waste water.
Data:
i) Domestic sewage flow = 9MLD.
ii) Industrial w/w flow = 1MLD.
iii) Organic loading rate = 0.8 Kg/ m3/d & Hydraulic loading rate 15 m3/ m2/d
v) Recirculation ratio = 2
Work out:
I) Volume of filter media.
II) Dimensions of trickling filter.
III) Efficiency & BOD 5 of treated effluent.
Data:
i) Domestic sewage flow = 9MLD.
ii) Industrial w/w flow = 1MLD.
iii) Organic loading rate = 0.8 Kg/ m3/d & Hydraulic loading rate 15 m3/ m2/d
v) Recirculation ratio = 2
Work out:
I) Volume of filter media.
II) Dimensions of trickling filter.
III) Efficiency & BOD 5 of treated effluent.
9 M
6 (b)
An activated sludge process is to yield an effluent BOD5 of 20mg/1 and suspended solids of 25 mg/l. The influent BOD5 following primary classifications is 160mg/l. Work out the following.
i) Volume of the tank,
ii) Recirculation ratio,
iii) Per day oxygen requirement.
Assumptions are
i) Mean cell residence time, ϕc = 10 days,
ii) Micro organism decay coefficient, kd=0.05,
iii) The growth yield coefficient, Y = 0.65,
iv) Waste flow is 10m3/minute.
i) Volume of the tank,
ii) Recirculation ratio,
iii) Per day oxygen requirement.
Assumptions are
i) Mean cell residence time, ϕc = 10 days,
ii) Micro organism decay coefficient, kd=0.05,
iii) The growth yield coefficient, Y = 0.65,
iv) Waste flow is 10m3/minute.
9 M
Answer any one question from Q7 and Q8
7 (a)
Write in details design parameters of aerated lagoons and mention the advantages and disadvantages of the same.
7 M
7 (b)
Design an oxidation pond to treat a domestic sewage flow of 3MLD at a place, the latitude of which is 24° N. The 5 day 20°C BOD of sewage is 250 mg/L, Photosynthetic oxygen yield is 225 kg/ha/day and k=0.23 per day. Assume necessary data if required.
9 M
8 (a)
Write design steps required for oxidation pond.
6 M
8 (b)
Explain algal-bacterial symbiosis in oxidation pond.
4 M
8 (c)
Write about constructional details and design criteria of oxidation ditch.
6 M
Answer any one question from Q9 and Q10
9
Design a septic tank to treat sewage from a working women hostel of 25000 residents. Water supply rate 120 lpcd.
Draw a neat sketch giving plan elevation of a septic tank designed above. Also design and draw a soak well for the above septic tank considering percolation capacity of the filter media say 1250 L/m3/day. Assume all other required data.
Draw a neat sketch giving plan elevation of a septic tank designed above. Also design and draw a soak well for the above septic tank considering percolation capacity of the filter media say 1250 L/m3/day. Assume all other required data.
16 M
Draw a neat sketch of conventional sludge digester and explain the following:-
10 (a)
Different stages of the digestion process.
4 M
10 (b)
Micro-organisms responsible for the process.
4 M
10 (c)
Design parameters of anaerobic digester.
4 M
10 (d)
Capacity of the digester.
4 M
Answer any one question from Q11 and Q12
11 (a)
Write short note on (any three):
Equalization and proportioning.
Equalization and proportioning.
6 M
11 (b)
Neutralization.
6 M
11 (c)
Sludge drying beds.
6 M
11 (d)
Sludge thickener.
6 M
11 (e)
Grab sample and composite sample
6 M
12
Explain the source of wastewater generation its characteristics and treatment options for its wastewater with the help of suitable flow diagrams for any two of the following industries.
i) Distillery Industry
ii) Dairy Industry
iii) Pulp and paper Industry
iv) Textiles Industry
i) Distillery Industry
ii) Dairy Industry
iii) Pulp and paper Industry
iv) Textiles Industry
16 M
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