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Environmental Engineering Practice Test: Water Softening
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Water softening is a process that removes calcium, magnesium, and sometimes iron ions from water. These ions make it difficult for products with other positively charged ions to dissolve in the water. Water softening is usually achieved using lime softening or ion-exchange resins. It can also be accomplished using nanofiltration or reverse osmosis membranes.
 

Topics include: Types of Hardness and Method of their Removal, Lime Soda Process, & Zeolite Process.

 

Environmental Engineering Practice Test: Water Softening
Time left 00:00
25 Questions

1. Softening chemicals, lime and soda do not depend on ____________
2. The total hardness of water is 100ppm as CaCO3 equivalent. What is the type of water?
3. The Total hardness of soft water as CaCO3 equivalent is __________
4. What is the pH at which recarbonation should be done?
5. The permanent hardness can be removed by adding lime and soda.
6. The sludge in water softening accelerator is deposited at ____________
7. Which chemical is used for removing the permanent hardness of Calcium chloride?
8. The thickness of the layers of filter sand of zeolite softener is ____________
9. The zeolite process is unsuitable for water containing iron and manganese.
10. Which of the following is a disadvantage of the zeolite process?
11. What is the detention time of a water softening accelerator?
12. The color of the artificial zeolite permutit is ____________
13. The minimum reaction time allowed in the recarbonation basin is ____________
14. Which of the following is not used for removing the permanent hardness?
15. The color of the natural zeolite is ____________
16. The chemical formula of Permutit is ____________
17. The temperature at which the softening of water takes place by lime soda process is ____________
18. The permanent hardness is also known as __________
19. Which of the following statement is wrong regarding hard water?
20. The detention period of a lime soda treatment plant is ____________
21. The temporary hardness in water is due to the presence of __________
22. The time required for the mixing of lime and soda in lime soda process is _____________
23. Which of the following causes the temporary hardness?
24. Natural zeolite is mainly processed from ____________
25. Which filter is normally used in the lime soda treatment plant?

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