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Environmental Engineering - II (October 2010)

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Total No. of Questions : 12] P1300 [Total No. of Pages : 4 [3864]-102 B.E. (Civil) ENVIRONMENTAL ENGINEERING - II (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Solve Q. 1 or Q. 2, Q. 3 or Q. 4, Q. 5 or Q. 6 from Section I and Q. 7 or Q. 8, Q. 9 or Q. 10, Q. 11 or Q. 12 from Section II. 2) Answers 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) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) Q2) a) Differentiate between separate and combined sewerage system. [6] b) Determine the size of a circular sewer for a discharge of 600 lps running half full. Assume S = 0.0001 and n = 0.015. [6] c) Write a short note on Drop Manhole. [4] OR a) Explain how treatability index helps in deciding the type of treatment.[6] b) The BOD5 of a waste has been measured as 650 mg/l. The rate constant is 0.12. Determine ultimate BOD and 3 day BOD at 27 C. [6] c) Define : [4] i) B.O.D. and ii) COD Q3) a) Discuss the following zones of a stream which is undergoing self purification. [6] i) Zone of degradation. ii) Zone of active decomposition. iii) Zone of recovery. iv) Zone of clear water. P.T.O. b) Give the Streeter-Phelps equation and explain each term in the equation. [6] c) Write short note on Oxygen sag curve. OR Q4) [4] a) Design the screen chamber of an ETP to treat a peak flow of 80 mld of sewage. Assume inclination of bars 45 with horizontal, Size of bars : 10 mm 70 mm; 10 mm dimension facing the flow, clear spacing between bars as 50 mm and the velocity through the screen as 0.8 m/sec at peak flow. [6] b) Design a grit chamber for the following data : [6] i) ii) Maximum flow Specific gravity of particle : : 20 mld 2.65 iii) Diameter of particle to be removed iv) Average temperature : : 0.2 mm and above 20 C v) Flow through velocity vi) Width of grit chamber vii) Freeboard : : : 0.23 m/sec 1.2 m 0.3 m viii) Space for sludge accumulation : 0.25 m. c) What is the difference between preliminary and primary treatment of wastewater? [4] Q5) a) Explain activated sludge process. What are the advantages and disadvantages of activated sludge process? [6] b) Design an activated sludge process for following data : [12] i) ii) Municipal wastewater flow rate BOD of settled effluent iii) BOD of treated effluent iv) Yield coefficient, Y v) Endogenous decay coefficient, kd = 10,000 m3/day = 150 mg/lit. = 5 mg/lit. = 0.5 kg/kg. = 0.05 d 1 vi) MLSS, X = 3500 mg/lit. vii) Return sludge solids concentration, Xr = 15,000 mg/lit. viii) Mean cell residence time, c [3864]-102 -2- = 10 days Determine : 1) Volume of reactor. 2) 3) 4) 5) 6) Q6) F/M ratio. Volumetric loading rate. Oxygen requirement. Recycle ratio. BOD removal efficiency. OR a) Design a high rate trickling filter using N.R.C. equation for following data : [10] i) ii) Sewage flow Recirculation ratio = = iii) BOD of raw sewage = iv) BOD removal in primary clarifier = v) Final effluent BOD desired = 10 Mld. 1.5 150 mg/lit. 30% 30 mg/l. b) Compare the conventional trickling filter and high rate trickling filter. [8] SECTION - II Q7) a) Write the design steps required for oxidation pond. b) Explain algae bacteria symbiosis. [6] [6] c) What is the difference between oxidation pond and aerated lagoon?[4] OR Q8) a) What is the principle involved in the design of oxidation ditch? [6] b) Write about constructional details and design criteria of oxidation pond. [6] c) How the detention period of oxidation pond is estimated? [4] Q9) a) Design a septic tank for a hostel housing 200 persons. Also design the soil absorption system for the disposal of the septic tank effluent, assume the percolation rate as 1500 minutes per m, L/B ratio = 4 and De-sludging period = 1 year. [10] b) Draw a neat figure of septic tank. Show plan, sectional elevation with [6] baffle walls, inlet outlet positions in detail. [3864]-102 -3- OR Q10) a) Draw a neat figure of unlined soak pit filled with broken brickbats. Explain its working. [6] b) What are the advantages and disadvantages of anaerobic treatment?[6] c) How does the anaerobic digestion works? [4] Q11) Draw a flow diagram for treatment of wastewater and write characteristics of wastewater for any two of the following industry. [18] a) Sugar industry. b) Dairy industry. c) Paper and pulp industry. OR Q12) a) Explain any one method of hazardous waste treatment. [6] b) What is waste minimization? Write classification of waste minimization [6] techniques. c) Explain Ignitability and toxicity in hazardous waste. [6] rrrr [3864]-102 -4-

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Additional Info : 2003 Course
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