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Environmental Engineering Practice Test: Unit Operations for Wastewater Treatment, Preliminary Treatment
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Avg score: 76% • Most missed: “Which of the following has a minimum detention period?”
Preliminary wastewater treatment involves removing larger visible particles that may harm equipment or cause operational issues. Some unit operations in preliminary wastewater treatment include: Screening: Removes larger floating objects Grit removal: Removes inert sand and inorganic particles Settling: Removes settleable suspended organic solids  Other unit operations in preliminary wastewater treatment include:  Grinding, Flotation, Equalization, Flocculation, Comminution, Oil and grease removal.  Topics include: Types of Unit Operations, Racks and Screen, Grit Chambers, Tanks and... Show more
Environmental Engineering Practice Test: Unit Operations for Wastewater Treatment, Preliminary Treatment
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25 Questions

1. Organic contaminants are removed from the wastewater by ____________
2. What is the maximum capacity of medium screen in collecting solids?
3. Which of the following has minimum detention period?
4. Screens are inclined to the direction of flow to ____________
5. Dealkalization results in removal of all the ions from the wastewater.
6. In which form of solute stabilization, hydrogen sulfide in the effluent is oxidized into sulfate?
7. The dimension formula of kinematic viscosity is ____________
8. Which form of solute stabilization occurs when effluent passes through limestone?
9. __________ is used to cut the sewage into smaller parts.
10. Which of the following has a minimum detention period?
11. Solids are removed from the wastewater by which of the following unit operation?
12. The dimension formula of dynamic viscosity is ____________
13. The head loss through the screen is given by HL = k* (Vt2 – Va2), where Vt and Va are velocities through and above the screen respectively. What is the value of constant k?
14. How many types of aerators are commonly used in the treatment of wastewater?
15. The maximum spacing between the bars in medium screen is ____________
16. The relation between dynamic and kinematic viscosity is given by ____________
17. The coefficient of drag for a transition settling is ____________
18. A pressure difference of _____________ is applied to the vacuum floatation method to remove impurities from sewage.
19. Which of the following device is used for the removal of oil and grease?
20. The minimum spacing between the bars on fine screen is ____________
21. Which of the following process is used to remove the colloidal particles from the effluent?
22. Flocculation of iron from water by the addition of lime is an example of which of the following process?
23. By which process, odor producing substances are oxidized?
24. The spacing between the bars in racks is ____________
25. In which unit operation, gases are released or absorbed in the effluent?

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