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2003 Course Environmental Biotechnology (Theory)

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Total No. of Questions : 6] P1279 [Total No. of Pages :3 [3664] - 365 B.E. (Biotechnology) ENVIRONMENTAL BIOTECHNOLOGY (2003 Course) (416281) (Sem. - I) (Theory) Time : 3 Hours] Instructions to the candidates: 1) 2) 3) 4) [Max. Marks:100 All questions are compulsory. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. SECTION - I Q1) a) What is the purpose of sedimentation? Where is it located in the treatment process? [6] b) The B.O.D. 5 of a surface water sample is 200 mg/litre at 20 C. The value of the reaction constant is K = 0.2 day-1 with base e . Calculate the ultimate B.O.D. of the sample. [6] c) With the help of examples differentiate between unit operations and unit processes. [6] OR a) Why is disinfection significant in waste water treatment? How is it done?[6] b) Write the equation for unseeded and seeded BOD5 estimations. c) Distinguish between primary and secondary treatment process for waste water. [6] Q2) a) How is oxygen controlled in the aeration system? What happens when the DO of waste water increases above the standards specified? [8] b) The daily flow to a trickling filter is 54,50,000 gpd (20628 cubic meter). If the BOD content of the trickling filter influent is 260 mg/L, calculate per day (either in pounds or grams) BOD entering the trickling filter. [8] [6] OR P.T.O.

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