Unit 4 Flashcards
How can THMs be removed from water ?
Charcoal
Why are THMs not allowed in water at levels above 80 ppb?
Can cause cancer
Ground water is impure and contains hardness ions.When does the water gain these ions.
Filtration when it rains
When ion exchange resin in a water softener is regenerated it (gains or loses)
Loses
Hardness ions (gain or losses) sodium ions
Gains
The name of the susbstance added during water treatment to kill germs and prevent diseases is?
Chlorine
In water treatment this process removes objects large objects like pop cans,stick,etc?
Screening
Some communities add Florine to thier drinking water supply’s?why?
So it can be healthier,reduce teeth decay
Why is adding chlorine to water through the post-chlorination step a concern?
Can cause forigen THM’s
The process of removing large particles from the water before treatment at a municipal water plant is known as?
Screening
In the lab if there were calcium ions remaining in the filtrate,a _______ removed formed whe. Sodium carbonate was added to the filtrate
Precipitate
Ion exchange resin possesses an attraction for
Mg,Ma,Fe,Ca
The method if water softening which involves passing hard water through a resin like that found water-softening unit is called?
Reverse osmosis
Converts dissolved orgaic susbstance a to few simple compounds.
Bacterial action
Removes ONLY large “suspended” particles?
Sand and gravel
