Lesson 3 - Water SAQ
This lesson allows you to test yourself on the material covered in the Water lesson and determine the level to which you have met the learning outcomes.
Self-Assessment Questions
1. * Explain the differences between the following:
a) Process water and product water
b) Permanent hardness and temporary hardness
c) Sedimentation, coagulation, and flocculation
d) Residual and non-residual sterilisation.
2. ** Describe the operation of a typical sand filter.
3. ** Why would you recommend having a system comprising WAC, SAC, WBA, and SBA versus one comprising only SAC and SBA? If you did not have sufficient funds for four separate ion exchangers, is there another option you would recommend?
4. ** Compare steam sterilisation versus hot water sterilisation for activated carbon filters. What are the relative advantages and disadvantages?
5. ** Discuss whether it is better to sterilise water at intake or at point of use, and what impact this could have across the water treatment process.
6. ** What are the main advantages of sand filters and ultrafiltration systems? When would you recommend a sand filter instead of ultrafiltration?
7. ** Compare crossflow and dead-end filtration:
a) Draw a basic sketch showing how this works. Be sure to show the feed and the filtrate as well as the concentrate if required.
b) Explain the different processes.
c) What are their main advantages and disadvantages?