Question Paper: Environmental Engineering - 2 Question Paper - December 2016 - Civil Engineering (Semester 7) - Mumbai University (MU)
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Environmental Engineering - 2 - December 2016

MU Civil Engineering (Semester 7)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question No. 1 is compulsory
(2) Attempt any three questions from remaining five
(3) Draw neat diagrams wherever necessary

Q1) Attempt any four

1(a) What is conservancy system and water carriage system?
5 marks 1619

1(b) Draw a neat sketch of Drop manhole.
5 marks 1620

1(c)Why velocity needs to be controlled in grit chamber?
5 marks 589

1(d) What is sludge volume index? What is its significance?
5 marks 524

1(e) Explain effect of noise pollution with control measures
5 marks 745

2(a) Give classification of air pollutants and control measures for gaseous and particulate matter.
10 marks 746

2(b) Design the dimensions of a septic tank for the following data:

No. of people = 130
Sewage/capita/day = 120 lit
Desludging period = 1 year
Length: Width = 4:1

10 marks 1115

3(a) Explain with neat sketch the working of a Trickling Filter. What is the principle on which it works?
10 marks 523

3(b) Design a conventional activated sludge plant to treat domestic sewage, given the following data:

Population = 36,000
Average sewage flow = 180 lped
BOD of sewage = 240 mg/lit
BOD removed in primary clarifier = 25%
Overall BOD reduction = 85%
Based on the information above, determine

• Volume of aeration tank
• Aeration period or H.R.T
• Sludge Retention Time
• Tank dimensions
10 marks

4(a) Calculate 2 day $37^0 C$ BOD of sewage sample whose 5 day $20^0C$ BOD is 180 $mg/lit$. Assume $K_D$ at $20^0 C$ as 0.1
10 marks 2854

4(b) Explain the necessity and process mechanism of anaerobic digestion of sludge. How the solid, liquid and gaseous products of digestion are disposed off?
10 marks 514

5(a) Design a sewer to serve a population of 35,000; the daily per capita water supply allowance being 160 litres, of which 80 percent finds its way into the sewer. The slope available for the sewer to be laid is 1 in 600 and the sewer should be designed to carry four times the dry weather flow when running full. What would be the velocity of flow in the sewer when running full?
10 marks 533

5(b) Differentiate between one pipe and single stack plumbing systems with neat sketch.
10 marks 1117

Q6) Write short notes on (any four)

6(a) Natural forces of self-purification.
5 marks

6(b) Anti-siphonage pipe
10 marks 3068

6(c) Oxidation pond
5 marks 3073

6(d) Sludge Thickner
5 marks 519

6(e) Sampling of sewage
5 marks 588