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Jacob\'s 6th grade science project where he tries to clean up a small oil spill from sea water.
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2. The Problem:
Oil spills such as the Exxon Valdez in Alaska have a devastating
effect on the environment. Unfortunately, although billions of
dollars have been invested in technology to obtain oil, very little
new technology exists to clean up oil that is spilled in the ocean.
In fact, oil still remains in Prince William Sound, where the Exxon
Valdez crashed, even though the spill happened in 1989, 9 years
before I was born. The effects of the oil can still be seen
today.
3. March 24, 1989, the supertanker Exxon Valdez ran aground on
Bligh Reef in Prince William Sound on Alaska's southern coast. Some
10.8 million gallons (40,900 kiloliters) of oil spilled from the
deep gash in the ship's hull, eventually washing up on more than
1,200 miles (1,900 kilometers) of pristine coastline, causing what
still stands as the worst oil spill in U.S. history. The impact on
local wildlife was devastating: An estimated 250,000 seabirds died
in the months after the spill, and 14 members of the 36 local
Prince William Sound killer whale pod had disappeared by 1990. The
so-called carcass count also tallied, among other creatures, 1,000
dead sea otters as well as 151 dead bald eagles, according to the
Exxon Valdez Oil Spill Trustee Council (EVOSTC), a group formed to
oversee restoration projects. Some of the spill remains to this
day, with a 2003 estimate pointing to about 20,000 gallons (75,700
liters) soaked deep into sands in intertidal zones, slowly
poisoning ducks and other shore creatures.
Scientific American, March 23, 2009
4. My Hypothesis:
Oil cannot be completely cleaned from seawater even in small
quantities.
5. My Procedure:
Most technology used to clean up oil spills in open water
(containment, absorbents, detergents, enzyme treatment) can easily
be replicated at home. We will not attempt burning the oil off for
safety reasons. I intend to recreate an oil tanker spill on a small
scale, and evaluate the effectiveness of several different methods
as individual variables in removing the oil. I will record the data
by photographing the entire process and use the photos to
demonstrate my progress in the cleanup. If this technology can be
relied upon to clean the entire ocean, they should be effective in
cleaning motor oil out of a baby swimming pool.
6. Materials
20 gallon inflatable swimming pool for infants.
1 quart heavy duty motor oil (the closest I can get to crude
oil.)
A plastic boat (my tanker.)
Sand
Sea grass
20 gallons tap water with salt added to simulate seawater.
Dawn dish detergent (contains a surfactant used by oil companies to
clean up oil spills)
SHOUT laundry stain remover (enzyme based oil remover)
Floating bumper to help contain oil floating on the water.
800 cotton balls
Measuring cup
Digital Camera
7. My simulated oceanComplete with beach, marshland (represented by
grass), and built on top of our hot tub. We turned the motor on to
simulate waves.
8. My tanker, filled with 8oz of motor oil.
9. The small amount of oil spread quickly to cover most of the
waters surface.
10. Step 1: Containment
The oil spread too quickly for the floating bumper I made to
contain it.
11. Step 2: AbsorbentsI tried to absorb the oil with cotton, each
cotton ball weighed approx. 1oz. Although only 8oz. of oil were
spilled a large amount of oil remained visible on the surface of
the water, even after 400 cotton balls.
12. Step 3: Dispersants
Dawn has a surfactant used to break up the oil.
It initially made the water very cloudy.
13. The oil broke up into small particles, but moved again to cover
the surface of the water, this time in a greasy cloud.
14. SHOUT laundry stain remover contains an enzyme used to break
down oil in the ocean. When we added this to the cloudy film that
resulted from the Dawn, the oil clumped back together in large
blobs.
15. Following the enzyme treatment, I scooped out as many of the
blobs of oil as I could easily see with a sandbox shovel. I then
decided to wait a day to see if smaller particles would merge
together again and if more oil would rise to the surface out of the
sand. This is what I found.
A photo of what is washing ashore from the recent disaster in the
Gulf of Mexico.
My Model
16. Again, I removed the visible oil by scooping it out. I waited
another 5 days to see what would happen. The sea grass I planted in
the sand began to die, and plenty of oil was still visible on the
waters surface.
17. Conclusions:
My hypothesis was correct. I found it impossible to completely
clean the water even with all the different techniques I used.
Ounce for ounce, I used 50 times as much cotton as there was oil
and my best estimate based on the visible oil was that I absorbed
less than half. The oil was very difficult to remove.
18. Conclusions: (continued)
The chemical additives did little to decrease the amount of oil in
the water, although adding the enzymes did seem to make it easier
to remove. No one technique, nor repeated attempts over time
enabled me to completely clean the water, even to the naked eye.
Even if I had removed all of the visible oil, I have no doubt that
I could have found oil particles if I had studied the water under a
microscope.
19. Results:
Results:
Every effort should be made to avoid oil spills. They are nearly
impossible to clean up, and have devastating effects on the
delicate ecosystems of coastal regions. After this experiment I am
worried about the effects of oil on the beaches where I live.
22. Bibliography:
American Scientific, March 2009
Photos courtesy of the following:
The Boston Globe
www.hotindienews.com
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