Download Water Quality

Water to
Drink
SHANNON
WILLAERT
IDT 510
ASSIGNMENT #4
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I will be able to…
 Describe the factors that affect water
quality.
 Explain why water is often treated before
people drink it.
 List and describe the steps of the water
treatment process.
 Explain what happens to wastewater in
most communities.
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Current Event
 Complete the worksheet – “Flint’s Drinking Water” –
to learn about a current event related to drinking
water.
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Water Quality
 The Environmental Protection Agency (EPA)
develops water-quality standards.
 The standards help to ensure that water is safe to
drink.
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Selected Water-Quality Standards
Substance
Limit
Arsenic
0.01 parts per million (ppm)
Carbon tetrachloride
0.005 ppm
Copper
1.3 ppm
Cyanide
0.2 ppm
Lead
0.015 ppm
Coliform count
No more than 5% of samples
taken in a month can be
positive.
pH
6.5 – 8.5
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Standards Explained
 pH – measures how acidic or basic the water is.
Acidic water can cause problems by dissolving lead
from pipes it passes through.
 Hardness – the combined level of calcium and
magnesium in water. Hard water does not easily
form suds and can lead to pipe-clogging deposits.
 Coliform count – measures the amount of E. coli
bacteria. Their presence of E. coli in water shows
that it contains human or animal wastes.
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Who determines quality
standards?
A. CDC (Center for Disease Control)
B. EPA (Environmental Protection Agency)
C. WHO (World Health Organization)
D. UND (University of North Dakota)
CORRECT!
 The EPA is responsible for deciding if water is safe to
drink as well as creating standards for ensuring good
water quality.
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Sorry, it is not the CDC.
 The CDC is responsible for monitoring the spread of
disease around the world.
 Go back
and try again.
Sorry, it is not the WHO.
 The World Health Organization is responsible for
monitoring disease outbreaks around the world.
 Go back
and try again.
Sorry, it is not UND.
 UND is responsible for educating students.
 Go back
and try again.
Why is water with a high
coliform count not good to
drink?
A. The water contains acid and may contain lead.
B. The water contains calcium and is hard.
C. The water contains bacteria from human and animal
wastes and may cause disease.
D. The water is OK to drink with a high coliform count;
water with a low coliform count is unsafe.
Sorry, you are incorrect.
 Coliform count does not have to do with acidity or
lead. Acidity has to do with pH.
 Go back
and try again.
Sorry, you are incorrect.
 Hardness deals with the amount of calcium and
magnesium in water. Coliform count is not about
hardness of water.
 Go back
and try again.
CORRECT!
 Coliform count is how much bacteria is in water.
The more bacteria, the more likely one is to get a
disease.
 You want the coliform count of the water you drink
to be low so that you do not get sick when you drink
water.
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Sorry, you are incorrect.
 Water with a low coliform count is actually safe to
drink. This means there is a very small number of
bacteria in the water.
 Go back
and try again.
Treating Drinking Water
 Water will go through the following steps in a water
treatment plant.
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1. First Filtration (large debris is removed)
2. Coagulation (alum is added to form sticky flocs)
3. Settling Basin (flocs sink into the settling basin)
4. Second Filtration (small debris is removed)
5. Chlorination (chlorine kills remaining organisms)
6. Aeration (air added to reduce odors)
7. Additional Treatments (water may be softened, fluoride
added)
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The Water Treatment Process
https://www.youtube.com/watch?v=tuYB8nMFxQA
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Water Distribution
 Once water is treated, it is
pumped to homes through a
network of pipes.
 Water towers may also be used
to store water until it is needed.
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What does aeration do to the
water during the treatment
process?
A. Aeration removes large debris.
B. Aeration kills tiny organisms.
C. Aeration makes the water smell better.
D. Aeration softens the water.
Sorry, you are incorrect.
 Filtration removes large debris from water.
 Go back
and try again.
Sorry, you are incorrect.
 Chlorination kills tiny organisms in water.
 Go back
and try again.
CORRECT!
 Aeration makes water smell and taste better.
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Sorry, you are incorrect.
 Aeration does not soften water.
 Go back
and try again.
How does water get from a
treatment facility to a home?
A. Water infiltrates the ground.
B. Water is pumped to homes through pipes.
C. Water is stored in a water tower.
D. Water is shipped from the treatment center to
your home.
Sorry, you are incorrect.
 Water that infiltrates the ground is now called
groundwater. Groundwater may get to your house
through a well, but this water has not been through a
treatment facility.
 Go back
and try again.
CORRECT!
 Water that has been treated at a treatment facility is
pumped through underground pipes to get to your
house.
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Sorry, you are incorrect.
 If water is stored in a water tower, than it cannot
reach your house. The water must be pumped from
the water tower to get to your house.
 Go back
and try again.
Sorry, you are incorrect.
 Water is not shipped to your house. This would be
take a lot of time, cost a lot of money, and be harmful
to the environment.
 Go back
and try again.
Treating Wastewater
 You create wastewater when you take a shower,
flush the toilet, or wash a load of laundry.
 Wastewater and the different kinds of waste in it
are called sewage.
 Communities deal with sewage through
wastewater treatment plants or septic systems.
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Wastewater Treatment Plant
 Wastewater flows from homes to sanitary sewers.
These sewers carry water to wastewater treatment
plants.
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Sewage Treatment Process
https://www.youtube.com/watch?v=gxgpK1EUZns
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Septic System
 A septic system contains a septic tank which is an
underground tank containing bacteria that treat
wastewater as it passes through.
 Occasionally a septic tank must be pumped so that
materials that do not break down do not fill the
tank.
 Water filters from the tank into a septic field and
over time, wastes break down naturally in the soil.
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Diagram of a Septic System
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How a Septic System Works
 http://www.gbra.org/septic.swf
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What happens to water after it
leaves a septic tank?
A. Water enters a septic field and wastes gradually break
down there.
B. Water enters a second holding tank and remains there
until it is pumped out.
C. Water stays in the septic tank.
D. Water is pumped into a network of pipes to be treated by
the sewage treatment plant.
CORRECT!
 Waste water that has entered the septic field is
underground and begins break down.
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Sorry, you are incorrect.
 Water goes directly from a septic tank to a septic
field.
 Go back
and try again.
Sorry, you are incorrect.
 Though some water will stay in a septic tank, most
water will go to the septic field after the septic tank.
 Go back
and try again.
Sorry, you are incorrect.
 Water from a septic tank does not get pumped to a
waste water treatment facility.
 Go back
and try again.
You should now be able to…
 Describe the factors that affect water
quality.
 Explain why water is often treated before
people drink it.
 List and describe the steps of the water
treatment process.
 Explain what happens to wastewater in
most communities.
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You should be able to define and use
the following words:
 Water quality
 Water treatment
 EPA
 Waste water
 pH
 Sewage
 Hardness
 Septic tank
 Coliform count
 Septic field
 Filtration
 Septic system
 Coagulation
 Chlorination
 Aeration
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THE END!