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2003 Course Environmental Eng. (Theory) (Elective)

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Total No. of Questions : 12] P1363 [Total No. of Pages : 3 [3764]-325 B.E. (Chemical) ENVIRONMENTAL ENGINEERING (Elective) (Theory) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidate: 1) Answer any three questions from each section. 2) Answer to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Your answers will be valued as a whole. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) Name and describe the four layers of the atmosphere. b) What are the primary pollutants? What are the secondary pollutants? Give examples. c) Explain the relationship between the adiabatic lapse rate of rising plume of stack gas and the ambient lapse rate. d) Name and define the two types of inversions. Which types prompts the formation of fog? [16] OR Name five natural removal mechanisms at work in the atmosphere. Which is the most important particulate removal mechanism. [8] Q2) a) b) What are two broad approaches to control of air pollution emissions. Explain in detail. [8] Q3) Write short notes on; a) NDIR spectrometry. b) Isokinetic sampling. c) Selection of particulate collector. d) [16] Fabric filter. P.T.O. 1 OR Q4) Write note on any four of the following; a) Ozone depletion. b) Chemical pollution. c) Effect of air pollution on human health. d) Air pollution laws and standards. e) [16] Control of air pollution in automobiles. Q5) a) Draw a neat sketch of cyclone separator. Compare the dimensions of conventional and high efficiency cyclone. [6] b) An air stream with a flow rate of 500 m3/min is passed through a standard cyclone of diameter 2 m. [6] i) Determine the cutsize for particles with density of 1.5 g/cc. ii) What will be the cutsize if same velocity was maintained in multiple cyclone of 400 mm diameter. Data :- Number of effective turns 5, Viscosity of air 2 10 5 kg/ms. c) List and compare different particulate emission control techniques. [6] OR Q6) a) A plate type electrostic precipitator for use in cement plant for removing dust particles consists of 10 equal channels. The spacing between the plates are 0.15 m and the plates are 2 m high and 2 m long. The unit handles 10,000 m3/hr of gas. What is the efficiency of collection. What should be the length of plates for achieving 99% collection efficiency if other condition are same. Where Vpm = 0.1 m/sec. [8] b) A conventional cyclone with diameter 1 m handles 3.0 m3/sec of standard air carrying particles with a density of 2000 kg/m 3. For Ne = 6, determine the cutsize, where a = 0.5 m, p = 2000 kg/m3, g = 1.81 10 5 kg/m.sec. [4] c) Explain the gravity settling Chamber with neat sketch. [6] SECTION - II Q7) Explain the basic concept of the activated sludge process and indicate the advantages and disadvantages of the two major kinds of activated sludge reactors, with neat diagram. [18] OR [3764]-325 2 -2- Q8) a) Define and describe the components of: i) Primary treatment. ii) Secondary treatment. iii) Tertiary treatment. [10] b) What are the major types and sources of grit in municipal waste waters. Describe the treatment methods used to remove grit. [8] Q9) a) Define and explain the significance of following parameters in activated sludge process. [12] i) Volumetric loading rate. ii) Food to mass ratio (F/M). iii) Hydraulic retention time. iv) Mean cell residence time. v) Recycle ratio. vi) Mixed liquor suspended solids (MLSS). b) What are the nine categories of water pollutants. [4] OR The following BOD results were obtained from a stream sample at 26 oC. Q10)a) t, d ii) b) 1 2 3 4 5 Y mg/L 0 i) 0 3 5.4 7 8.3 9 6 7 8 9 9.6 9.8 10 10.1 Compute the reaction rate constant K and the ultimate first stage BOD, using least square method. [8] Compute the reaction rate constant at 20 oC, = 1.047. A large stream has a rate of retention (base e) K2 = 0.45 d 1 and the rate of deoxygenation K1 = 0.25/day. The dissolved oxygen deficity (DO) of a mixture of water stream and the waste water at the point of reference is 1.5 mg/L and the ultimate BOD of waste (Lu) is 65 mg/L. Calculate [8] the critical time (tc) and the critical deficity (Dc). Q11)Discuss how you would run a sanitory landfilling operation in your city. Be sure to include the technical, economical considerations. [16] OR Q12)List in a tabular form the advantages and disadvantages of the following methods of solid waste disposal in detail. Incineration, sanitory land fill, composting and pyrolysis. [3764]-325 3 -3- [16]

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