Enviromental Engineering Exam 2

Enviromental Engineering Exam 2 - 4) Introduction to...

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Unformatted text preview: 4) Introduction to Environmental Engineering 1. 2. 10. 11. 12. Exam 2 Review Questions What is COD?...C ................. ..O ......................... ..D ...................... .. COD is a direct measure of ............................................................. .. COD is indirect measure of .............................................................. .. What is BOD?...B .................... ..O ......................... ..D .......... ....... .. BOD is a direct measure of ............................................................. .. BOD is indirect measure of .............................................................. .. In an experiment to estimate BOD5, 50 mL wastewater was mixed with 250 mL distilled water (with no BOD). The mixture was placed in a 300 mL BOD bottle. Oxygen was provided and the initial D0 in the BOD bottle was 8 mg/L. After 5 days, the DO was reduced to 2 mg/L. a. What is BOD5 of the mixture .................................. ..(in mg/L) b. What is the BOD5 of the wastewater alone .................. ..(in mg/L) TS = TVS + ................... .. TSS = VSS + .................. .. TDS = VDS + ................. .. Estimate the following: TS .................................. ..mg/L TVS = ......................... ..‘.....mg/L TFS = .............................. ..mg/L 1 . . Dish +‘ Dry Dish + Burned‘ Sample Volume Weight of DlSll Solids (1030C) Solids—(2500C) 85.375 g Estimate the following: T SS ............................... ..mg/L VSS = .............................. ..mg/L FSS = ........................... ..mg/L 13. 14. 15. 16. 17. 18. Filter + Burned Solids 550°C 01426g . Filter + Dry 0.1400 g 0.1530 g From the data in Questions 12 and 13, estimate the following: 200 mL Sample Volume TDS ............................... ..mg/L VDS= . .......................... -mgm FDS= ........................... “mgl TSS can be harmful because: (u ............................................................................................ - a) ............................................................................................ - BOD5 can be harmful because: a) .......................................................................................... " Turbidity in water affects algae growth in the following way: . . . . . - . . . . - . . . . . . . . . . ~ . - . - . . . . . . . . . . . . . . - . - . . . . . . . . . . . . . . . . . . . - . - . - . . . . . . . . . . . . . . . . . . . . . . . . . . . .- . . . . . . . - - . - . . . . . . . . . . . . - . - . . . . . . . . . . . . - . . . . . . . . . . . . . . . . a . - . . - . . . . . . . . . . . . . . . . . . . . . . . - . - . . . . - . - . . u . . . . . . . . . . - . - . . . . . . . . . . . . - . . . . . . . . . . . . . . n . o u . q . . . . . . . . . . . . . . - . u . . . . . . . . . . . . . . . . . . . . . . . . . . . - ~ - -. Turbidity may consist of‘the following: “ x (l) microorganisms, such as bacteria ....................................... .. (2) suspended solids ........................................................... .. (3) Dissolved solids .................. ............................... ...... .. .u 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. The sources of Energy for microorganisms are: (1) ............................................................................... .. (2) ............................................................................... .. (3) ............................................................................... .. The sources of Carbon for organisms are: (1)..-. .......................................................................... .. (2) ............................................................................... .. Autotrophic Microorganisms obtain their Energy from: (1) .................................. ..and thus are called Photosynthetic. (2) .................................. .. and thus are called Chemosynthetic. Heterotrophic Organisms obtain their energy from: (1) ......................................................................................... .. (2) ............................................... ........................................ .. Autotrophic Microorganisms obtain their Carbon from: (1) ................................................................. .................... .. Heterotrophic Organisms obtain their Carbon from: . (1) .......................... ..4 .............................. n. .......................... .. Aerobic microorganisms survive in environments that has oxygen in the form of ......................................................................................... .. Anaerobic microorganisms survive in environments that do not have oxygen in the forms of ............................. ..'. ....... ..or ................... ............... .. Facultative microorganisms can survive in environments that have oxygen in the forms of ....................................... ..or .................................... .. Anoxic environments have the following forms of oxygen ......................... .. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. Aerobic environments have the following forms of oxygen ...................... .. Anaerobic environments do not have oxygen in the forms of .......................................... ..or ............................................ .. Plants, such as algae, in water require the presence of the following main ingredients to grow: (1) ............................................. .. (2) ....... .. .................................... .. (3) ............................................ .. Which is the nutrient that limits the growth of algae in a water that has 10 mg/L N and 4 mg/L P? and why? . . n . . - n . . a . . - - . . . . . . . . . . . . . . . . u . . . . . . - . . o . . . . . . - . . - . . . . . . . . . . . . . . . . - - . u . . . . . . . . . . . . . . u . . o . . . . . .- . - - . u - . . . . . . . . . . . . . . . . . . . . . . . . . . - - . . . . . . - . u - a . . . . . . . . . . . . . . . . - . . - . - . . . . . . . . . . . . . . . . . . - . . . . . . . . .. . . . . . . - . . . . . . - . . . . . - a . u - . u . . . - . . . . . . . . . . . . . . . . . - . . u . . - - . . - . . . . . . . . . . u . . . . . u . . . - . . . . . . . . . . . . . - . . . If the composition of algae can be represented by the following formula: C105H263016N15P Atomic Weights ((3:12, H = 1, 0:16, N=14, P=31) and if the consumption rates for N and P are proportional to the amounts of N and P needed for growth, then which is the limiting nutrient in a water that contains 003 mg/L N and 0.01 mg/L P: Limiting nutrient is ....................................................................... .. Which is the limiting nutrient in a water that contains 0.04 N and 0.001 mg/L P. Limiting nutrient is ........................................................................ .. The discharge of oxygen demanding contaminants in water bodies results in ........................................................................................... .. . . . - . . . . . . - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - . . . . . - . . . . . . . . . . . . . . . . . . . - - . . - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - . . . . . . - . . . . . u u . . . . .. . . . . . . . . . - - . . . . . . . . . - . . . - . . . . . . . . . . . . . . . . u . . . . . . - . . . . . . . . . u . . . . . . - . . - . . . - . . - . - - i . . . . . . . . . . . . . . .- Oxygen consumption due to discharge of oxygen demanding contaminants result according to the following reaction . . . - . . . . . . . . . . . . . . . . . . . - - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - . . . - . . . . . . ~ . . - . . . . .. u . u - . . - - . . - . . . . . . . . . . . . . . . . . . . . - . . . . . . . . . . . . . . . . - . . - . . . - . . - . . . . . . - . . . ~ . - - . . . . . . . . . . . . . . . . . . . - . .- ~ . - - . . - u . . - . . - n . . . . . . . . . - . . . . . . . . . - . . . . . - - . . . . . . - . . . . . - - . . - . . - . . . . . . . . . . . . . . . . . - . . - . . . . . . - . . -. Septic conditions result due emission of ...................... .. according to the following reaction ........................................................................ .. . . u . . . . . . . u . . . . . . . - . . . . . . . . . . . . . . . u . . - . . - . . . . - . . - . - n . - . . - . . - . - - . . . . . . . . . . . . . . . . . . - . . . . - . . . . . . . . . . . - . . . . - . - - . - . . - . . - . - - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . u . . - . . - . . . . - . . - . - . . . . . . . . . . . . . . . . - . . . . -. 39. The discharge of N and P in water bodies can result in the following effects: (1) ........................................................................................ .. (2) ......................................................................................... .. (3)....._ ................................................................................... .. 40. The discharge of suspended solids results in the following direct and indirect negative impacts: (1) ........................................................................................ .. (2) ......................................................................................... .. 41. What are the three processes that affect the level of D0 in water following the discharge of wastewater containing BOD: (1) ........................................................................................ .. (2) ......................................................................................... .. (3) ........................................................................................ .. 42. A fresh water river with D0 = 9 mg/L, BOD5 = 0 mg/L, flow of 9 m3/s and velocity = 1 m/s receives a wastewater discharge of 1 m3/s with D0 = 0 mg/L and BODs = 100 mg/L. Given the following (t = seconds, BOD and D0 in mg/L): BODs Remaining I. __ * —0.0005*t DO reduction due to BOD removal (only) D0 = 0 * 8—0.0005“! t I: DO added due to Re—Aeration ‘\ t K -0.0005 ” I D0 : [9_{16.67*(e—0l0005*t _e—0.0008*t)+0'9*e—O.0008*t}]_D0’=0 *e Determine the following: BOD5 at x =0 ...................................................................... ..mg/L BODs at x= 1500 m ............................................................. . .mg/L BOD5 at X = 10000 m ............................................................ . .mg/L 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. DO at x =0 due to BOD removal ............................................... ..mg/L DO at x =1500 m due to BOD removal ...................................... ..mg/L DO at x =10000 m due to BOD removal ..................................... ..mg/L DO at x =0 due to Re-aeration ................................................... ..mg/L DO at x =1500 m due to Re-aeration ......................................... ..mg/L DO at x=10000 m due to Re-aeration ......................................... ..mg/L Draw the DO sag curve resulting from the wastewater discharge in the above question. Also determine the exact location of the point with minimum DO. Explain the Osmosis and Reverse Osmosis concepts and how RO is used for desalination. Show the sequence of typical surface water treatment processes and explain the objective and treatment principle of each step. Show the sequence of typical wastewater treatment processes and explain the objective and treatment principle of each step. Explain what is done to manage the residues (large objects, grit and sludges) from wastewater treatment plants. Explain digestion and the principles of treatment of each of its two types. Define noise pollution. What is the mathematical function that represents (Bel) or (Level). What is the unit of measurement of sound level?. What are the main sources of community noise? .\ What is the noise level resulting from adding the following three sources: 70 dB, 75 dB, and 82 dB. Sounds can have the same leVel but differ in ...................................... .. Louder sounds have higher ............................................................ .. To represent noise exposure and impacts, we need to know: Noise level, which is important because ........................................... .. Loudness, which is important because ............................................. .. Time of exposure, which is important because ................................... .. no) cl 56. 57. Cumulative exposure, which is important because ............................... .. Type of noise, which is important because ........................................ .. To measure noise, we can use devices that employ: (1) Weighting Networks, which provide the following information in terms of sound level and frequency (a) ................................ ..(b) ..................................... .. (2) Octave Bands, which provide the following information in terms of sound level and frequency (a) ................................ ..(b) ..................................... .. Highway noise depends on the following factors, among others: ( 1) Traffic Speed (2) .............. .. (3) ............. .. (4) ............. .. (5) ............. .. ...
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Enviromental Engineering Exam 2 - 4) Introduction to...

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