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2003 Course Environmental Eng. (Elective I)

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Total No. of Questions : 12] P1125 [Total No. of Pages : 3 [3664]-276 B.E. (Chemical) ENVIRONMENTAL ENGINEERING (Elective - I) (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions : 1) Answer any three questions from each section. 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) 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) b) Discuss about hydrological cycle. [8] The exhaust gas from a motor vehicle shows CO concentration of 2 o percent by volume. What is the concentration of CO in mg/m3 at 0 C and 1 atm. [8] OR Q2) A capacitive power plant of MW with 40% thermal efficiency is to be designed which will use residual oil with 1% sulphur content. The emission factors for burning 1m3 of oil are : particulates = 1 kg, NO2 = 10 kg and SO2 = 16 S kg. Where S is the % sulphur content of oil. What are the rates of emission of particulates NO2 and SO2 to the atmosphere if no control devices are provided. The heating value of oil is 8000 KCal/kg and its density may be taken as [16] 950 kg/m3. Q3) a) b) Q4) a) b) Discuss about types of Plumes. Give the types of inversion. [8] [8] OR Write briefly about air quality modeling. [8] One model of the atmosphere assumes a constant density. Find the lapse rate for the atmosphere and indicate whether this is stable or unstable case. Assume that the atmosphere obeys perfect gas law. [8] P.T.O. Q5) a) b) Draw a neat sketch of cyclone separator, compare the dimensions of conventional and high efficiency cyclone. [10] Before the installation of an ESP, the stack gas of a power plant contained 6.0 gm particulates per m3 of gas. The gas flow rate is 350 m3/min and the new precipitator can move 2500 kg particulate/day. [8] i) What is the emission rate of particulates before and after pollution control in kg/day? ii) What is the efficiency of the ESP? iii) Will the new system meet an emission standard of 0.7 gm/m3. OR Q6) Water is used in a spray chamber as the spray fluid to treat standard air containing particles with a density of 1000 kg/m3. The flow of air is 120 m3/min. and that of water is 0.3 m3/min. The average drop size is 1000 m. The spray chamber has a diameter of 1 m and a height of 3 m. What is the overall collection efficiency of the chamber if the average particle size is 2.5 m. For the above particles the individual drop collection efficiency may be taken as 9.0 %. [18] SECTION - II Q7) Derive tC = K 1 K K1 ln 2 ( T ). 2 1 for oxygen Sag curve. K 2 K1 K1 K1 L4 [18] OR Q8) A typical wastewater treatment plant of a industry discharges secondary effluent to the stream which is on the surface. In the summer, measurements are taken and found that a maximum flow rate of 15000 m3/day, a BOD of 40 mg/lit, DO is 2 mg/lit and temperature of 25oC. The upstream from the point of discharge of wastewater is found to have a minimum flow rate of 0.5 m3/s, a BOD of 3 mg/lit, a DO of 8 mg/lit and a temperature of 22oC. The velocity of the mixture is 0.2 m/s from the flow regime, the reaction constant is estimated to be 0.4 day-1 for 20oC conditions. Draw a DO profile a 100 km reach of the stream below the discharge. [18] Q9) Discuss about the primary, secondary and tertiary treatment in detail. [16] OR Q10)Show that for a completely mixed activated system, the concentration of microorganism (X) is given by [16] X =Y c (S o S c ) ( + c K d ) 1 Where c is mean cell residence time. [3664]-276 -2- Y is the mass of micro-organism produced per unit mass of substrate utilised, S0 is the influent substrate concentration, is the hydraulic retention time. Se is the soluble food concentration in the reactor and Kd is the microbia decay coefficient. Q11)Write short note on :a) Trickling Filter b) [16] Aerobic digestor. OR Q12)Write short note on :a) Waste management Hierarchy. b) Composting. rrr [3664]-276 -3- [16]

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