Question Paper: Environmental Engineering 2 Question Paper - May 16 - Civil Engineering (Semester 7) - Mumbai University (MU)
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## Environmental Engineering 2 - May 16

### 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 questions.
(3) Assume any suitable data where ever required.
(4) Figures to the right indicate full marks.

Q1) Attempt any four:

• a) Explain effect of noise pollution with control measures. 745

• b) Why sewers are designed to run partially full? 529

• c) What do you understand about aerobic decomposition and anaerobic decomposition? 520

• d) Define F/M and Sludge Age 525

• e) Draw a neat sketch of Drop manhole. 1620

(20 marks)

2(a) Calculate 2 day 37$^o$C BOD of sewage sample whose 5day 20$^o$C BOD is 150 mg/lit. Assume K$_D$ at 20$^o$C as 0.1
(10 marks) 2854

2(b) Explain the various system of plumbing.
(10 marks) 1116

3(a) 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

3(b) Describe physical, chemical and Biological characteristics of sewage and their significance in Waste water Treatment.
(10 marks) 1618

4(a) Explain the modifications in the conventional sludge process. What are the draw backs of conventional activated sludge process?
(10 marks) 516

4(b) Design the dimensions of a septic tank for a small colony of 150 persons provided with an assured water supply frokm the municipal head-works at a rate of 120 litres per person per day. Assume any data, you may need.
(10 marks) 1115

5(a) Determine the size of a high rate trickling filter for the following data:
Flow= 5.5Mld
Recirculation ratio= 1.5
BOD of raw sewage= 280mg/lit
BOD removed in primary clarifier=25%
Final effluent BOD desire=40mg/lit

(10 marks) 526

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

Q6) Write short note on (any four)

• a) Differentiate between combined and separate system of sewage. 528

• b) Sludge volume Index 524

• c) Sludge Thickener 519

• d) Grit Chamber 582

• e) Anti-siphonage pipe 3068

(20 marks) 00