Potential role of anaerobic plant-associated bacteria in naphthenic acid degradation.
Morvan S, Correa-García S, Bergeron M-J, Trepanier K, Vander Meulen IJ
Phytoremediation
Constructed wetlands — the same reed-and-sedge systems used in stormwater gardens and ecological restoration projects — may hold the biological machinery needed to detoxify one of North America's most stubborn industrial pollutants, validating wetland planting as a remediation tool.
Oil sands mining in Canada produces enormous amounts of contaminated wastewater loaded with toxic chemicals that are very hard to break down. Researchers built small artificial wetlands using water sedge plants and studied the microscopic organisms living in the roots, soil, and water to see which ones could eat these chemicals. They found that bacteria that thrive without oxygen — the kind found deep in waterlogged sediments — may be especially important for cleaning up this pollution.
Key Findings
Constructed wetland treatment systems using aquatic plants like water sedge show promise for reducing naphthenic acid fraction compounds (NAFCs) in oil sands process-affected water
Anaerobic (oxygen-free) plant-associated bacteria in sediments and rhizosphere zones are identified as potentially significant contributors to NAFC breakdown
Microbial communities across three distinct microhabitats — sediments, rhizosphere, and open water — each play different roles in the degradation process, though their relative contributions remain poorly characterized
chevron_right Technical Summary
Scientists are using wetland plants and their root-zone microbes to break down toxic chemicals left over from oil sands mining operations, finding that certain bacteria thriving in low-oxygen environments may be key players in cleaning up this persistent pollution.
Abstract Preview
Plant-associated microorganisms can break down many contaminants, including naphthenic acid fraction compounds (NAFCs)-one of the toxic contaminants in oil sands process-affected water (OSPW). One ...
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