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Environmental Engineering - II (April 2010)

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Total No. of Questions : 12] [Total No. of Pages : 4 [3764]-102 P1463 B.E. (Civil) ENVIRONMENTAL ENGINEERING - II (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to 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) a) b) Explain giving reasons, when to adopt separate and combined systems.[6] Design a sanitary sewer for following data: i) Population = 120000 persons. ii) [6] Rate of water supply = 200 Lpcd. iii) Value of N = 0.013. iv) Peak factor = 3. v) c) Slope = 1 in 700. Differentiate Dry Weather Flow and Wet Weather Flow. [4] OR Q2) a) Describe the procedure for laying and testing of sewers. [6] b) The BOD5 of a waste has been measured as 500 mg/l. The rate constant is 0.12. Determine ultimate BOD and 3 day BOD at 27 C. [6] c) Explain the necessity of DO fixation while determining DO in water and state procedure for the same. [4] P.T.O. Q3) a) Draw a figure showing different zones of stream pollution and discuss in detailed about zone of active decomposition. [6] b) What are the natural forces acts for the purification for streams? [6] c) Write short note on Oxygen sag curve. [4] OR Q4) a) A screen consisting of 10 mm diameter bars, at a clear spacing of 40 mm, treats a maximum hourly flow of 1200m3. Velocity of flow through the screen chamber is 0.75 m/ sec. [6] Work out: i) Length and number of bars. ii) Head loss in the chamber. b) Explain the purpose of providing grit chamber and give design criteria for grit chamber. [6] c) What is the difference between preliminary and primary treatment of wastewater? [4] Q5) a) Explain with the help of a flow diagram, the essentials of activated sludge process. [6] b) Design an activated sludge process for following data: i) Municipal wastewater flow rate = 12,000 m3/day. ii) BOD of settled effluent = 150 mg / lit. iii) BOD of treated effluent = 5 mg/lit. iv) Yield coefficient, Y = 0.5 kg/kg. v) Endogenous decay coefficient, kd = 0.05 d 1. vi) MLSS, X = 3000 mg/lit. vii) Return sludge solids concentration, Xr = 15,000 mg/lit. viii) Mean cell residence time, c = 10 days. Determine: a) b) F/M ratio. c) Volumetric loading rate. d) Oxygen requirement. e) [3764]-102 Volume of reactor. Recycle ratio. f) BOD removal efficiency. 2 [12] OR Q6) a) Design a high rate trickling filter using N.R.C. equation for following data. [10] i) Sewage flow = 8 Mld. ii) Recirculation ratio = 1.5. iii) BOD of raw sewage = 300 mg/lit. iv) BOD removal in primary clarifier = 30%. v) b) Final effluent BOD desired = 30 mg/l. Explain with sketch the biological process in trickling filter. [8] SECTION - II Q7) a) Distinguish clearly between the working of an oxidation ditch and oxidation pond. [6] b) Explain algae bacteria symbiosis. [6] c) Classify the different types of oxidation ponds. [4] OR Q8) a) Write the design steps required for oxidation pond. [6] b) What are the advantages and disadvantages of aerated lagoons? [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 plain sectional elevation with baffle walls, inlet outlet positions in detail. [6] OR Q10)a) Write the various design parameters of anaerobic digesters. [6] b) What are the advantages and disadvantages of anaerobic treatment? [6] c) What are the different stages of digestion in case of anaerobic digesters? [4] [3764]-102 3 Q11)a) b) Draw a flow chart for treating sugar mill and dairy wastewater. What are the characteristics of distillery spend wash? [12] [6] OR Q12)a) Explain any one method of hazardous waste treatment. [6] b) What are the benefits of hazardous waste reduction? [6] c) Explain Ignitability and toxicity in hazardous waste. [6] Y [3764]-102 4

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Additional Info : April 2010 Examination - Environmental Engineering - II (2003 Course)
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