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How do leachate collection systems work in secure landfills?
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hazardous-waste management
Employees loading transuranic waste into a shipping container at Vallecitos Nuclear Center, a nuclear research facility in Alameda county, California.
In secure landfills designed for hazardous waste, leachate collection systems are critical components used to prevent environmental pollution and the contamination of groundwater.12
These facilities utilize a double-liner system, with a network of perforated pipes positioned above each of the two impermeable liners. The system functions as follows:1
- Upper Collection System: This network is designed to prevent the accumulation of leachate trapped within the waste fill.1
- Lower Collection System: This serves as a secondary backup to ensure containment if the primary system is bypassed.1
- Treatment: Once collected by these pipe networks, the leachate is pumped out of the landfill and transported to a treatment plant.1
To further minimize the generation of leachate, an impermeable cap is placed over the landfill once it is finished, which reduces the amount of water infiltrating the fill. Additionally, groundwater monitoring wells are maintained around the site to detect potential leaks, allowing for the interception and treatment of any polluted water.1