Questions For Thinking And Discussing

1. Calculate the settling velocity of coal particles in water at 20° C. The average size of the particles is 225 pm.

2. Develop a detailed process flow scheme for a wastewater treatment plant. The contaminants that are to be removed are TSS, BOD, E. coli, various nutrients, heavy grit, oil and grease.

3. Explain how the activated sludge process works.

4. Explain the difference between, and compare the advantages and disadvantages between rapid- sand and slow-sand filtrations.

5. Explain the process of digestion and when it should be used.

6. Make a list of chemical flocculating agents and relate each of these chemicals to the specific types of contaminants they are best suited to handle in wastewater. Obtain MSDS (Material Safety Data Sheets) for each of these chemicals.

7. Define hydraulic performance.

8. List the mechanisms and forces that are important to sand filtration.

9. What chemicals can be used for bed regeneration and how is this operation performed?

10. Define a colloidal suspension and give some examples.

11. Explain what is meant by a sludge displaying thixotropic behavior.

12. How does one control slurry recirculation of solids in the reaction zone?

13. Under what conditions would skimmers be used in wastewater treatment?

Chapter 8

SEDIMENTATION, CLARIFICATION, FLOTATION, AND COALESCENCE

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