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2008 Registered Environmental Engineer Professional Examination Multiple-choice questions on the first day of the afternoon test 1. Judgment of the characteristics of various types of oxidation ditches. Please see page 155 of Volume 1 for details on solving the problem. 2. Determination of urban sewage discharge standard levels. Please see page 72 of Volume 3 for details on solving the problem. 3. A sewage treatment plant in a coastal city has a sludge treatment process with a daily processing capacity of 250,000 tons. A Aerobic treatment B Anaerobic treatment C Sanitary landfill D Deep sea landfill Answer: B Anaerobic treatment is the correct answer. 4. Judgment of observation conditions of various microorganisms during biochemical treatment. 5. Calculation of hydraulic retention time of stabilizing pond. 6. What mechanisms does the cohesion principle include? 7. Judgment of the characteristics of various types of sedimentation tanks. 8. Investigation of water volume change coefficient. 9. Judgment of the characteristics of various types of filtering technology. 10. Characteristics, similarities and differences between pure water and demineralized water. 11. Judgment of reverse osmosis characteristics. 12. Judgment of the characteristics of various types of chemical precipitation. 13. Methods for oxidation ditch optimization. Please see page 156 of Volume 1 for details on solving the problem. 14. Judgment of the characteristics of various types of biofilm methods. 15. Some requirements and methods for online testing. 16. Judgment on some methods of phosphorus removal. 17. Investigation on process knowledge points of phosphorus removal. 18. Judgment of characteristics of various types of land treatment 19. Investigation of characteristics of remaining sludge in oxidation ditch. Please see page 157 of Volume 1 for details on solving the problem. 20. Calculation of microbial sludge age. 21. Adjustment characteristics of sludge return. 22. Judgment of the characteristics of various types of flocculation tanks. 23. Judgment of the characteristics of various types of secondary sedimentation tanks. 24. Judgment of the characteristics of various types of concentration tanks. 25. Various instrument options for aeration. 26. Selection of aerator type. 27. Industrial oily wastewater treatment methods. 28. Investigation of knowledge points on electromagnetic pollution of transmission lines. 29. Noise punishment methods. Please see page 129 of Volume 4 for details on solving the problem. 30. Investigation of noise standard knowledge points. Please see page 195 of Volume 3 for details on solving the problem. 31. Investigation on knowledge points of railway noise standards. For details on solving the problem, see Table 1 on page 198 of Volume 3. 32. What principle does the sound-absorbing spike used in the sound absorption treatment of the anechoic chamber use to achieve a wide frequency range of 0.99? The answer is the one that uses impedance gradient. Please see page 429 of Volume 3 for details on solving the problem. 33. Investigation of sound source types. When the distance between a certain sound source and the body is doubled and then reduced by 3dB, what type of sound source can this sound source be regarded as? Point A sound source B line sound source C/D solution: Line B sound source is the correct answer. 34. Examination of the knowledge points of the reverberation radius ro 35. Examination of the knowledge points of the sound absorption principle. 36. Calculation of critical Hz when the anastomosis effect occurs. 37. Calculation of sound insulation transmission loss 38. Judgment of characteristics of various types of mufflers. 39. Acoustic evaluation investigation of muffler. 40. Judgment of noise propagation type characteristics. Multiple choice question 41. Examination of knowledge points on deep well aeration. 42. Investigation on knowledge points of papermaking wastewater discharge standards. For details on solving the problem, see Table 1 on page 82 of Volume 3. 43. Investigation on knowledge points of pig emission standards. Please see page 96 of Volume 3 for details on solving the problem. 44. Judgment of characteristics of various types of regulating pools. 45. Examine various knowledge points on the use of activated carbon. 46. Various metal ion chemical precipitation methods. 47. Investigation on knowledge points of blow-off process. 48. Judgment of characteristics of plug-flow activated sludge process. 49. Investigation on process knowledge points of denitrification. 50. Investigation of process knowledge points of anaerobic treatment. 51. Investigation of knowledge points about oxidation ponds. 52. Investigation of knowledge points of submersible flow pumps. 59. Regarding the radio interference limit of high-voltage AC overhead transmission lines, when the frequency is 1MHz, which of the following statements are correct? A500V high voltage, radio interference limit is 55dB. B330V high voltage electricity, radio interference limit is 50dB. C330V high voltage electricity, radio interference limit is 53dB. D330V high voltage, radio interference limit is 48dB. answer: For details on solving the problem, see Table 1 on page 201 of Volume 3. The data in Table 1 are set when the frequency is 0.5MHz, so 5dB should be subtracted from the data in Table 1, so the correct answer should be D. Since it is a multiple-choice question, I personally think that the 330V in front of the answer B is misprinted, and it should be 500V. What I finally chose was BD 63, three 48dB sound sources, what is the total sound source? What is the wrong answer to the following criteria? A does not exceed the limit. B exceeds the limit by about 4dB. C exceeds the limit by about 3dB. D exceeds the limit by about 1dB. answer: In the table on page 341 of the second volume, the total sound source of three 48dB sound sources is 52.8dB, and the standard value is 50. ABD is the correct answer. 65. Content assessment of the anechoic chamber. Answer related knowledge points include: The anechoic chamber is divided into a fully anechoic chamber and a semi-anechoic chamber. The fully anechoic chamber has sound absorption treatment on all six sides of the room. The semi-anechoic chamber has a solid and smooth reflective surface on the ground. For detailed problem solving, see Volume 2, page 429, 70. Examination of knowledge points on vibration reduction. 1 On the first day, I took a test on the recycling process of lead-acid batteries (choose acid leaching). 2 On the first day, I took a test on the recycling process of waste rubber powder. 3. Double-layer sound insulation walls made of aluminum plates and other materials. Which of the following measures can effectively improve the sound insulation?: A. Fill the air cavity with sound-absorbing material ； B. Apply damping material on the surface of the sound insulation wall ； C. Turn the connection between sound insulation walls into a rigid connection ； D. The thickness of the air layer changes from 100mm to 150mm.