Which of the following statements is correct regarding to Streeter-Phelps Do sag

Question

Which of the following statements is correct regarding to Streeter-Phelps Do sag equation? (a) It uses the same unit as total maximum daily load (TMDL). (b) It has been developed (c) It is for one-source waste discharge only. using oxygen deficit rather than oxygen concentration. (d) It is for BOD calculation only 2What type of lake is defined as high productivity (high algal growth)? (a) Oligotrophic (b) Eutrophic (c) Mesotrophic (d) Senescent lakes Which of the following statements is not correct regarding to Federal water Pollution (a) It requires providing secondary treatment for wastewater. 3.- Control Act? system (NPDES) system. (c) It established pretreatment standards for discharging industrial wastewater into municipal treatment system. (d) It prohibits all municipal sewage sludge dumping into ocean (b) It established a permit 4Microorganisms can be classified in a number of ways. Autotrophs and heterotrophs are classified based on (a) energy source (b) electron donor (c) carbon source (d) electron donor. in water and wastewater treatment, unit operation means the pollutants will go through 5 (a) only physical changes physical, chemical, and biological changes. (b) both physical and chemical changes (c) only chemical changes (d) In the secondary step of wastewater treatment, which process that sludge is oxidized (c) Activated and recycled under aerobic conditions? (a) Rotating biological contactor (b) Lagoon sludge (d) Trickling filter 7. Which process is methane produced during the wastewater treatment? (a) Activated sludge (b) Trickling filter (c) Anoxic decomposition (d) Anaerobic decomposition 8, According to US EPA, which of the following is not one of the six criteria air pollutants? (a) Ozone (b) Carbon monoxide (c) Nitrogen oxides (d) Carbon dioxide 9This air pollutant is an asphyxiant. When inhaled, it binds to hemoglobin to form carboxyhemoglobin. 10 NO2 (d) O (a) CO, (b) sO2 (c) NO2 (d) co Which of the following is a product of photochemical reactions? (a) co, (b) S0, (c)

Explanation / Answer

1. b

2. b

c. d

4. a

5. d

6. c

7. d

8. a

9. d

10. a . CO2 is the product of the photochemical reaction

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