How do you treat contaminated rainwater at a DuPage County landfill? Let the trees do the cleaning. Here are the natural ways they do it.
Since coming online in 2018, a 14-acre irrigation system of 8,500 trees has treated more than 20 million gallons of the leachate that otherwise would have been trucked to a water treatment plant. That's curbing emissions, saving energy and cutting costs for the district.
"It is gratifying to me that the International Phytotechnology Society considers our site a model of science and engineering put into practice and worthy of attention," said Dan Zinnen, the district's director of resource management and development,"because from the time the project was conceived, we wanted it to both functionally address our environmental protection needs and demonstrate that landfills need not be wastelands -- they can be a valuable part of the landscape if...
Since then, the county has put a series of systems in place to address the issue, including a network of about 30 wells drilled throughout the landfill. The county also keeps tabs on potential contamination at each of its landfills with groundwater monitoring wells. The trees use ammonia as fertilizer, neutralizing one of the district's more dire concerns being so close to the river -- ammonia is extremely harmful to aquatic life. Inorganic compounds like metal also can be absorbed by the trees, which store them in their wood as they grow.
The overall goal is to slowly draw down how much leachate is in the landfill, preventing it from leaking into the river or down into the groundwater. The district is able to treat up to 5.4 million gallons a year with the system. This spring, the district planted a host of native tree seeds: walnut, Kentucky coffee tree, oak, redbud and dogwood.
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