1.
2.
a. Evaporation and then condensation, which gets
rid of almost all dissolved substances.
b. Bacterial action changes dissolved organic
contaminants into a few simple compounds.
c. Filtration through sand and gravel gets rid of
almost all suspended matter.
3. Floculation is the process where the alum and
slaked lime react to form aluminum hydroxide.
4. Calcium Oxide can be added to neutralize such
acidic water, raising its pH to a proper level.
5. Near 1 ppm of fluoride is added in order to
reduce tooth decay.
6. Adding chlorine to water has helped save
countless lives by controlling water borne diseases and killing lethal bacteria
in water.
7. Chlorine in water can react
with organic compounds produced by decomposing animal and plant matter to make
potentially harmful substances.
8. Water from a clear mountain stream may need
chlorination to make it safe for drinking because the there is possibly
bacteria and other dangerous contaminants in the water.
9. An alternative to the use of chlorination
in municipal water treatment is using an activated charcoal filter. This can
excrete most organic compounds from water.
18. If evaporation stopped, then condensation and
precipitation would, as well. And if those stop, then the whole cycle will not
properly function.
19. The cycle would not exist because it would not
be able to "cycle” since there would be no evaporation, etc.
20. EPA only limits the concentration of THMs, but
does not completely get rid of it.
21. The processes of evaporation and condensation
have a lot in common with distillation. When water passes gravel, sand, and
rock, matter is filtered out, just like in sand filtration.
22.
a. 1 ppm fluoride
b. 7 ppm fluoride
c. 365 ppm fluoride
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