Environmental Engineering - 2 Question Paper - December 2014 - Civil Engineering (Semester 7)

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Environmental Engineering - 2 - December 2014

MU Civil Engineering (Semester 7)

Total marks: --
Total time: -- INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

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 marks

1 (b) Explain causes and effects of air pollution. 5 marks

1 (c) Name the two factors used as criteria for selection of pipe diameter and slope in design of sewer. 5 marks

1 (d) Define Noise and explain its effects and control measures. 5 marks

1 (e) Define sludge . What are the factor controlling digestion. 5 marks

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? 5 marks

2 (b) Explain the principle and operation of an oxidation ditch. List its merits and demerits. 5 marks

3 (a) What are the criteria to be used in deciding the material for sewer pipes? 5 marks

3 (b) Differentiate between aerobic and anaerobic treatment of sewage giving major end products. Name one treatment method in each category. 5 marks

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. 5 marks

4 (b) Draw a flow diagram of sewage treatment plant for a medium, sized town. 5 marks

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. 5 marks

5 (b) Discuss the stage of biological action constituting sludge digestion. 5 marks

6 (a) State the merits and demerits of combined system and separate system. 5 marks

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 5 marks

7 (a) Explain the operational problems in ASP and Tricking filter. 5 marks

7 (b) Explain factors affecting self purification of stream. 5 marks

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