Closing the chloride loop: Halophyte biomass for circular road salt management.
Chiasson A, Dimovska K, Ramesbottom A, Bilton A, Cartwright L
Phytoremediation
The roadside grasses you drive past all winter may actually be quietly cleaning chloride out of the soil and waterways that feed your local streams, wetlands, and garden wells.
When cities spread road salt in winter, a lot of it seeps into the ground and nearby water, where it builds up over time and harms plants and wildlife. Some tough grasses can soak up that salt through their roots. This study showed that you can rinse that salt back out of the harvested grass — recovering nearly all of it — and potentially reuse it as road salt again, closing the loop.
Key Findings
Active leaching recovered nearly 100% of chloride from harvested grass biomass using four times less water than passive rinsing, which only removed up to 70%.
Halophyte stands could recover an estimated 4–21 grams of chloride per square meter per year — comparable to the amount applied in a single winter road salt treatment.
This is the first study to demonstrate a scalable method for reclaiming road salt from phytoremediation biomass, with pathways to integrate into existing vegetation management infrastructure.
chevron_right Technical Summary
Researchers found that salt-tolerant grasses growing along roadsides can absorb road salt from contaminated soil, and that chloride can then be efficiently washed out of the harvested plant material and potentially reused — creating a circular system that reduces the need for new salt purchases.
Abstract Preview
Road salt contamination is an increasing environmental concern in cold-climate cities, where repeated applications lead to long-term chloride accumulation in soils and waterways. Salt-tolerant vege...
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