This exercise was developed by Dr. Michael Hotz, Wyandotte High Science Teacher and Lead Teacher at the KCK Saturday Science and Math Academy
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Appearance: | |||||||
Odor: | |||||||
STEP
1: Aeration -- Cap the two liter bottle and aerate the water aby
shaking it vigorously for 30 seconds. Pour the water into one of the
cut-off two liter bottles, and then pour the water back and forth
between the cut-off two-liter bottles five times. Once you are done,
rank the appearance and odor of the water.
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Scale: Apperarance 1-5 with 1 being clear. Odor 1-5 with 1 having no odor.
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Appearance: | |||||||
Odor: |
STEP
2: Coagulation--The water should be in one of the cut-off two-liter
bottles. Add 20 grams (1 teaspoon of alum crystals to the container and
stir gently for 5 minutes. The alum wil act as a coagulant and bind
with the particles suspended in the water. Describe what happens to the
appearance of the water during the 5 minutes.
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STEP
3: Sedimentation--Leave the container undistrurbed for 20 minutes, and
record the observations of the water's appearance at 5 minute
intervals.
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STEP
4: Filtration--Construct the filter apparatus as directed(go back to
the top under Constructions). Pour approximately 1 liter of clean water
through your filter to clean it.(Be sure to have a collecting container
under the filter before you do this.) Pour this water down the drain.
Carefully and slowly pour off the top two thirds of the water in the
container into a clean beaker(or cut off bottle). It is important that
you do not disturb the sediment when pouring, so take a great deal of
care during this step. Allow the water to settle, and then pur 400 ml
of water from the beaker into the filter aparatus. The water will
percolate through the sand and pebbles and collect in the beaker beneath
the apparatus. Describe the appearnace and odor of the water after it
has been filtered. Pour the remaining water and sediment in the two
liter bottle into the 5 gal white bucket.
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Scale: Apperarance 1-5 with 1 being clear. Odor 1-5 with 1 having no odor.
1 | 2 | 3 | 4 | 5 | |||
Appearance: | |||||||
Odor: |
STEP
5: Disinfection: The final step in the process, the elimination of
any remaining microorganisms, WILL NOT BE DONE in this exercise. This
is normally an important step in the process, but as the water is not to
be consumed and disinfection methods can be dangerous outside of
controlled conditions, this step will not be done.
ANALYZING RESULTS: Appearance--Rank the appearance through out the treatment process.
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Scale: Apperarance 1-5 with 1 being clear. Odor 1-5 with 1 having no odor.
1 | 2 | 3 | 4 | 5 | |||
Contaminated Water | |||||||
Aeration | |||||||
Coagulation | |||||||
Sedimentation | |||||||
Filtration |
ANALYZING RESULTS: Odor--Rank the odor through out the treatment process.
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Scale: Apperarance 1-5 with 1 being clear. Odor 1-5 with 1 having no odor.
1 | 2 | 3 | 4 | 5 | |||
Contaminated Water | |||||||
Aeration | |||||||
Coagulation | |||||||
Sedimentation | |||||||
Filtration |
Did the appearance change from the begining to the end?
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- Yes
- No
- Stayed the same.
Did the odor change from the begining to the end?
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- Yes
- No
- Stayed the same
How well would you say this filtration process worked?
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Go to EPA website for instructions