This floating pond plant pulls heavy metals from treated sewage water
Topal M, Öbek E, Çelik E, Arslan Topal EI
Phytoremediation
The scummy green mat you've probably skimmed off a pond or ditch is actually a tiny metal-scrubbing machine that could help clean up water before it reaches rivers and lakes near you.
Researchers added a common floating water plant called Lemna gibba, a type of duckweed, to real wastewater at a treatment plant and tracked how well it removed dozens of elements over four weeks, comparing it to tanks without the plant. The duckweed pulled out aluminum almost completely (nearly 90%) and knocked out more than half of the cobalt, antimony, and titanium in the water, proving that this tiny plant isn't just pond scum but a legitimate tool for cleaning polluted water.
Key Findings
Lemna gibba removed up to 89.66% of aluminum from municipal wastewater effluent over four weeks of monitoring.
Removal efficiencies exceeded 50% for cobalt (57.86-60.61%), antimony (64.25-67.35%), and titanium (63.27-66.21%).
Statistical modeling (PCA and HCA) explained 85% of total variance, confirming the plant's measurable contribution beyond the treatment plant's existing secondary clarifier.
chevron_right Technical Summary
A floating pond plant called Lemna gibba (duckweed) can soak up metals like aluminum, cobalt, antimony, and titanium from treated wastewater, boosting cleanup rates at a municipal treatment plant by nearly 90% for aluminum alone.
Abstract Preview
Original paper
Phytoremediation of elements in municipal wastewater treatment plant effluent by Lemna gibba L.: a full-scale study.
In this study, capacity of naturally growing Lemna gibba L. in removing elements (B, As, Al, Ca, Ba, Co, Fe, Cu, K, Cr, Li, Mo, Ni, Mn, Na, Mg, Sb, P, Si, Pb, Se, Ti, Zn, V, and Sr) from the efflue...
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Lemnoideae is a subfamily of flowering aquatic plants, known as duckweeds, water lentils, or water lenses. They float on or just beneath the surface of still or slow-moving bodies of fresh water and wetlands. Also known as bayroot, they arose from within the arum or aroid family (Araceae), so oft...