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2003 Course Environmental Biotechnology

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Total No. of Questions :11] P1113 [Total No. of Pages : 3 [3864] - 435 B.E. (Biotechnology) ENVIRONMENTAL BIOTECHNOLOGY (2003 Course) (Sem.- I) (416281) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate answer books. 2) Draw diagrams wherever necessary. 3) Maximum marks for each question is given in parentheses. SECTION - I Q1) Describe the variations of the conventional activated sludge process for wastewater treatment. Mention the advantages and disadvantages of each type. [18] OR Q2) a) b) An 1800 ml of activated sludge is allowed to settle for 30 minutes. At the end of the settling time the sludge volume is 1300 ml. What is the thirty minute settled sludge volume (SSV 30). If the mixed liquor concentration of a waste water sample is 3200 mg/L, what is the sludge volume index (SVI)? [9] Explain the different methods employed for dewatering sludge. [9] Q3) What is the significance of sampling in wastewater? Describe the different types of sampling techniques. Why is equalization done? [16] OR Q4) a) b) What are the different types of aeration mechanisms employed in suspended biological treatment method? [8] o The B.O.D5 of a surface water sample is 250 mg/litre at 25 C. Assuming the value of the reaction constant K = 0.23 day-1 to the base e , estimate the ultimate B.O.D of the sample. [8] Q5) Differentiate any four: a) Chemical coagulation and Chemical precipitation. b) Stabilization Ponds and Aerated lagoons. c) Fixed film biological process and suspended growth process. d) Adsorption and Absorption. e) Sedimentation and flocculation. f) Chlorination and Irradiation. [16] P.T.O.

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