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Environmental Engineering - II (October 2009)

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Total No. of Questions : 12] P929 [Total No. of Pages : 4 [3664]-102 B.E. (Civil) ENVIRONMENTAL ENGINEERING - II (2003 Course) (401003) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Solve all questions. 2) Answers to the two sections should be written in two separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Your answer will be evaluated as a whole. 6) Use of non programmable calculator is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) Differentiate clearly between BOD and COD. How do you determine the BOD and what are the limitations of BOD tests? [4] b) Write a short notes on testing of new sewers. [6] c) The BOD of a sewage incubated for one day at 30 C has been found to be 110 mg/L. What will be the 5 day 20 C BOD? Assume K1 = 0.1 at 20 C. [6] OR Q2) a) State the common laboratory tests conducted on sewage and their importance in the treatment and disposal of sewage. [4] b) State whether COD value and BOD value of same sample would be same? Or different? If it is different which will be greater? Why? [6] c) Design a sanitary sewer main to discharge a peak flow of 100 L/Sec within a mini velocity of 0.6 m/Sec and maxi of 2 m/sec Sewer length between two man holes = 100 m GL at U/S end of sewer = 50.500 GL at D/S end of sewer = 50.200 Depth of soil cover above sewer at U/S end = 1.5 m q/Q v/V N 0.838 1.120 0.013 0.671 1.072 0.013 Workout the invert level at the D/S end of the sewer. [6] P.T.O. Q3) a) Draw a figure showing different zones of stream pollution and discuss in detailed about zone of active decomposition. [4] b) Write Streeter - Phelps equation and explain the terms used in the equation. [6] c) Explain the factors governing de-oxygenation re oxygenation. [6] OR Q4) a) What is the difference between preliminary treatment and primary treatment. [4] b) A medium screen is to be designed for the following data. i) Screen flow 1 million lit per hour. ii) Inclination of Screen 45 0.3 m iii) free board iv) Bar size 10 mm 50 mm at 50 mm clear spacing Design Screen chamber, length and numbers of bars [6] c) A grit chamber is to be designed to handle a sewage flow from population of 50,000 and per capita daily consumption of water is 135 Lit design [6] grit chamber. Q5) a) Draw a neat flow diagram for a conventional Activated Sludge Process. [6] [6] b) Explain the following terms: i) Sludge Volume Index. ii) MLVSS. iii) Mean Cell Residence Time. iv) HRT. c) Determine the aeration period, BOD loading in Kg/m /day, F/M ratio, total solids, Suspended solids, BOD removal efficiency and recirculation ratio of ASP which is [6] operating with the following data. i) Waste water flow 35000 m /day. ii) Influent total solids 600 mg/lit. iii) Influent suspended solids 120 mg/ lit. 175 mg/lit. iv) Influent BOD (S0) v) Effluent total solids 495 mg/lit. vi) Effluent suspended solids 22 mg/lit. vii) Effluent BOD 20 mg/lit. viii) MLVSS 2500 mg/lit. ix) Returned Sludge Solids 9800 mg/lit. x) Volume of aeration basin 10000 m . [3664]-102 -2- OR Q6) a) Write about trickling filter: i) Construction and operation. ii) Filter media. iii) Under drainage system. b) What are the advantages and disadvantages of trickling filter. [6] [6] c) Determine the size of a high rate trickling filter for the following data.[6] i) Sewage flow 5 mld. ii) Recirculation ratio 1.5 iii) BOD of raw sewage 230 mg/L. iv) BOD removal in PST 30%. v) Final effluent BOD Desired 25 mg/L. SECTION - II Q7) a) Explain the bacterial-Algae symbiosis in oxidation pond. [4] b) Distinguish clearly between the working of an oxidation ditch and oxidation pond. [6] c) Write in detail design parameters of aerated lagoons and mention the advantages and disadvantages of the same. [6] OR Q8) a) Discuss with sketch the working of oxidation pond. b) What are the advantages and disadvantages of oxidation ditch. [4] [6] c) Design a oxidation pond to treat a domestic sewage flow of 3 MLD at a place, the latitude of which is 24 N. The 5 day 20 C BOD of sewage is 250 mg/L, Photosynthetic oxygen yield is 225 kg/ha/day and k = 0.23 per day. Assume necessary data if required. [6] Q9) a) Write a short note on Septic tank. [4] b) Design a septic tank to treat sewage from a working women hostel of 2500 residents. Water supply rate 120 lpcd. Draw a neat sketch giving plan elevation of a septic tank designed above. Also design and draw a soak well for the above septic tank considering percolation capacity of the filter media say 1250 L/m /day. Assume all other required data. [12] OR [3664]-102 -3- Q10) a) Write the design parameters of anaerobic digester. [4] b) Draw a neat sketch of dispersion trench plan and section and explain its construction and working in detail. [6] c) Draw a simple line diagram of standard rate anaerobic digester showing various space allocations for digested sludge storage, active digestion, supernatant, scum and gas storage in detail. [6] Q11) a) Explain equalization and proportioning. [6] b) Discuss in brief various treatment processes adopted for treating industrial waste water. [6] c) Explain the following points related to sugar industry. i) Manufacturing process and waste water generation. ii) Characteristics of waste water and iii) Methods of treatments. [6] OR Q12) a) What is the difference between grab sample and composite sample. [6] b) Explain the characteristics of pulp and paper mill waste. [6] c) Draw the flow chart for treating dairy waste water. [6] W [3664]-102 -4-

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Additional Info : 2003 Course
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