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Contamination and Cleanup |
| Section: NATURAL SCIENCE / WATER AND HUMAN DESTINY |
| Author: Marc J. Defant |
| Publication: The world & I online |
| Issue Date: 4/1/2003 |
| Size: 591 Words, 3,953 Characters |
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Potential sources of groundwater contamination range from the surface runoff of pesticides and fertilizers to injection wells used for disposing of industrial and hazardous wastes deep underground. Other potential sources include septic tank systems, landfills, mining operations, and underground storage tanks. A few examples illustrate the challenges of keeping groundwater pure.
Septic tank systems and injection wells for waste disposal are both based on the idea that wastes can be safe...
. . .
...lves injecting air through deep wells. As the air returns to the surface, it passes through the aquifer collecting volatiles from the contaminants, such as gasoline. The injected air also oxygenates the aquifer, supporting the growth of bacteria that can help eliminate the contaminants. Another practice requires that water be pumped out of the aquifer, cleaned, and then pumped back.
----M.J.D.
(500 of 3,953 characters)
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