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Environmental Engineering - II (October 2009)

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Total No. of Questions : 12] P929 [Total No. of Pages : 4 [3664]-102 B.E. (Civil) ENVIRONMENTAL ENGINEERING - II (2003 Course) (401003) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Solve all questions. 2) Answers to the two sections should be written in two separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Your answer will be evaluated as a whole. 6) Use of non programmable calculator is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) Differentiate clearly between BOD and COD. How do you determine the BOD and what are the limitations of BOD tests? [4] b) Write a short notes on testing of new sewers. [6] c) The BOD of a sewage incubated for one day at 30 C has been found to be 110 mg/L. What will be the 5 day 20 C BOD? Assume K1 = 0.1 at 20 C. [6] OR Q2) a) State the common laboratory tests conducted on sewage and their importance in the treatment and disposal of sewage. [4] b) State whether COD value and BOD value of same sample would be same? Or different? If it is different which will be greater? Why? [6] c) Design a sanitary sewer main to discharge a peak flow of 100 L/Sec within a mini velocity of 0.6 m/Sec and maxi of 2 m/sec Sewer length between two man holes = 100 m GL at U/S end of sewer = 50.500 GL at D/S end of sewer = 50.200 Depth of soil cover above sewer at U/S end = 1.5 m q/Q v/V N 0.838 1.120 0.013 0.671 1.072 0.013 Workout the invert level at the D/S end of the sewer. [6] P.T.O.

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Additional Info : 2003 Course
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