Drinking Water Flashcards
Describe the steps needed to make fresh water suitable for drinking?
Get water from the reservoir
That water goes to the water treatment plant
It’s aerated (adds oxygen to remove iron)
Sedimented (adds aluminium sulphate to remove clay)
Filtered (add a carbon slurry to remove smells)
Sterilised (adds chlorine and ozone to kill microorganisms and bacteria )
Add sulphur dioxide to remove excess chlorine
Gets put into the mains
Either goes to the industry or into homes
How can you purify water when you know what it contains?
You can use simple distillation
How can fresh water be obtained from sea water?
It’s called desalination and it can be achieved used simple distillation
Why must water being used for chemical analysis must not contain any dissolved salts?
Because otherwise incorrect results will be obtained
What is producing pure water from sea water called?
Desalination, this can be achieved using simple distillation
What does chemical analysis involve?
Chemical analysis involves using chemical reactions or sensitive machines to identify and measure the substances in a sample, the water used fir chemical analysis should not contain any dissolved salts otherwise incorrect results will be obtained
In the uk’s where does the raw material used for drinking water come from? What does this water contain?
Rivers, lakes or aquifers (underground rocks containing ground water)
Fresh water from these sources contain:
Objects such as leaves and twigs
Small insoluble particles such as grit and silt
Soluble substances, including salts, petrified so and fertilisers
Bacteria and other microorganisms that might be harmful to health
What are the steps to safe drinking water?
Screening (using a sieve)
Sedimentation (in which small particles are allowed to settle out)
Filtration (using tanks containing beds of sand and gravel
Chlorination (chlorine is added to kill all the microorganisms in the water)
