Transcript water purification methods

GRADE FOUR
Presenter:
Sidonie Frater
 State what is water purification
 Identify the methods of water purification
 Suggest which method is most appropriate
 Link appropriate methods the given situations
 Discuss limitations of distilling
 Work in groups to present method of purifying
using creative ways
What is water purification?
 Water purification is the transition of dirty
harmful (Contaminated) water into clean safe
water.
WHY PURIFY WATER?
 We purify water to get rid of contaminants that
can be detrimental to our health.
What Is Water Purification?
Water purification generally means freeing water
from any kind of impurity it contains, such as
contaminants or micro organisms.
Water Purification Defined
Water purification, or drinking water treatment,
is the process of removing contaminants from
surface water or groundwater to make it safe and
palatable for human consumption.
Methods of purifying Water
 Boiling
 Filtering
 Distilling
 Chlorinating
Boiling
Main menu
Filtering
Main menu
Distilling
Main menu
Chlorinating
Main menu
Which Method is Appropriate?
There are various methods of water
purification and filtration, some
more effective at removing certain
types of contaminants than others.
Which Method is Appropriate?
 Whilst there are contaminants in every water
supply, the methods of water purification and
filtration you'll use will depend on 3 things: (1) the
state of your local water supply; (2) the cost and
performance of the filtration unit and (3) their
health-benefits.
Boiling
 The general advice is to boil all water for 5-10
minutes plus 1 minute for every 300m above sea
level, up to around 5500m where boiling becomes
ineffective.
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for picture
Filtering
Some home water filtration
systems can remove chemical
contaminants for example, but
fail to effectively remove
microbiological ones
(bacteria) from your water
supply. Therefore, these are
not "purifiers" in the true
sense of the word.
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for picture
Distilling
Of all the methods of water
purification and filtration,
distillation is considered in
some quarters to be the
best.
It removes the widest variety
of contaminants such as
salts, chemicals, bacteria
and other micro-organisms
from your water supply.
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for picture
limitations of Distilling
Produces flat tasting water
that is stripped of the trace
minerals that your body
needs.
 Some doctors contend that this can lead to
multiple-mineral deficiencies within the body.
However some experts contend that most of the
bodies mineral needs are met through eating food,
not drinking water. Therefore the effect of demineralized water on the body is still being hotly
debated
Chlorinating
Super-chlorination. This uses
a high dose of chlorine but
later neutralizes it using
hydrogen peroxide, and is
very effective.
Chlorine tablets. Used alone
these won't protect against
Guardia. Instead use a fine
filter and half a tablet.
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for picture
View For Additional Content
 Wiki water purification
 Cleanwater
 Methods of purification
 Work in groups of four to present information on
water purification methods.
THE END