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Environmental Engineering 2 Question Paper - Dec 17 - Civil Engineering (Semester 6) - Mumbai University (MU)
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Environmental Engineering 2 - Dec 17

As per credit based old syllabus

Civil Engineering (Semester 6)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1(a) What is conservancy system and water carriage system?
(5 marks) 11152

1(b) Compare, in a tabular form, low rate and high rate tricking filters.
(5 marks) 12230

1(c) What are drop manholes and lamp holes?
(5 marks) 11153

1(d) What is self-purification of stream?
(5 marks) 11227

2(a) Design a septic tank for a hostel housing 125 persons. Also deign the soil absorption system for the disposal of the septic tank, effluent, assuming the percolation rate as 20 minutes per cm.
(10 marks) 11223

2(b) Explain with the help of diagram, various systems of plumbing used for house drainage.
(10 marks) 11154

3(a) Explain the necessity and process mechanism of anaerobic digestion of sludge. How the solid, liquid and gaseous product of digestion are disposed off?
(10 marks) 11228

3(b) Design a conventional activated sludge plant to treat domestic sewage, given the following data:
Population=40,000
Average sewage flow=180 lpcd
BOD of sewage = 240mg/lit
BOD removed in primary clarifier = 25%
Overall BOD reduction = 80%
Based on the information above, determine

  • a) Volume of acration tank.
  • b) Aeration period or H.R.T.
  • c) Sludge Retention Time
  • d) Tank dimensions
(10 marks) 11224

4(a) During BOD test conducted on a 5% dilution of waste , the following observations were taken.

  • i) DO of aerated water used for dilution = 3.6mg/lit
  • ii) DO of original sample = 0.8mg/lit
  • iii) DO of diluted sample after 5 day incubation = 0.7mg/lit
    Compute a) 5day BOD b)Ultimate BOD
(10 marks) 11226

4(b) Explain with diagram various equipment's used for the control of particulate pollutants.
(10 marks) 11232

5(a) Draw a neat sketch of a typical sewage pumping station and describe in brief the functions of each.
(8 marks) 12231

5(b) Explain in brief different testing methods for sewer pipes and why sewers run partially full.
(6 marks) 11211

5(c) Design a circular primary settling tank for a town having a population of 50,000 with a water supply of 180 litres per capita per day.
(6 marks) 11218

6.a. Write short note on : Sampling of sewage.
(5 marks) 11127

6.b. Write short note on : Control measures of noise pollution.
(5 marks) 11151

6.c. Write short note on : Recycling and reuse of waste water.
(5 marks) 12232

6.d. Write short note on : Grit Chamber.
(5 marks) 11219

6.e. Write short note on : Anti-siphonage pipe.
(5 marks) 11213

6.f. Write short note on : Inverted siphon.
(5 marks) 11216

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