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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. a) The DO of a given water sample was 7.4 mg/L at the start of the test. After 5 days the sample had a DO of 2.5 mg/L. Calculate the BOD5 of the sample if seeding was done with 2 ml of seed material having concentration 90 mg/L. [8] b) Microorganisms are critical in biological treatment. Discuss. [8] Q3) a) What is activated sludge process? Write the advantages and disadvantages of the activated sludge process. [8] b) In a rotating biological contractor, explain how the slime growth (biomass) on the plastic media looks under (i) normal conditions, and (ii) abnormal conditions? [8] OR a) Briefly describe the different types of fixed film biological process for waste water treatment? [8] b) What are Aerated lagoons? Discuss the principle, advantages and disadvantages of aerated lagoons. [8] SECTION - II Q4) a) b) Draw a schematic diagram for the process flow of waste water treatment. [8] What is neutralization? Why is it done in waste water treatment? [8] OR a) Discuss the treatment methods commonly used for distillery effluent.[8] b) With the help of a neat sketch discuss the working of grit chamber. [8] Q5) Write short notes on ANY TWO : [16] a) Characteristics of Tannery effluent. b) Hazardous wastes. c) Sludge disposal. d) Waste minimization. Q6) a) With the help of a neat sketch describe the process of land farming. Discuss the applications of land farming. [9] b) How is composting done? What are its applications in waste management? [9] [3664]-365 2 OR Compare and Contrast ANY THREE : a) Ex-situ and In-situ Bioremediation b) Biostimulation and Engineered bioremediation c) Bioventing and Bioaugmentation d) Bioremediation and Phytoremediation e) Suspended and Fixed film bioreactors kbkb [3664]-365 3 [18]

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