Sorption-mediated organohalide respiration biokinetics of tetrachloroethene.
Ting Y, Lombard N, Sowers KR, Ghosh U
Soil Health
Contaminated industrial sites leaching chlorinated solvents into soil and groundwater are a quiet threat to the water table feeding the wells, streams, and garden beds in surrounding communities — this research nudges the cleanup toolkit closer to something that actually works in place.
Scientists are trying to clean up soil and water polluted with a toxic industrial chemical called tetrachloroethene — the same stuff used in dry cleaning. They found that helpful bacteria, when stuck onto charcoal-like particles buried in contaminated sediment, can break down the chemical just as fast as bacteria swimming freely. The catch: the charcoal can also soak up vitamins the bacteria need, so you have to make sure enough nutrients are available for the microbes to keep working.
Key Findings
Biofilms of Dehalobacter chlorocoercia DF-1 attached to activated carbon, graphite, and silica maintained comparable dechlorination rates to their free-floating (planktonic) counterparts.
Sorption of B-vitamins to certain sorbents reduced bacterial biokinetics, highlighting nutrient availability as a critical design variable for this remediation approach.
Activated carbon sorption suppressed aqueous chloroethene concentrations but did not reduce net molar transformation, suggesting an active interplay between sorption and microbial dechlorination.
chevron_right Technical Summary
Researchers tested whether bacteria attached to activated carbon can clean up tetrachloroethene (a common industrial solvent) in contaminated sediments just as effectively as free-floating bacteria. They found the attached bacteria performed comparably, though vitamin availability on certain surfaces can slow the cleanup process.
Abstract Preview
Combining microbial bioaugmentation and activated carbon sorbent amendment is an emerging approach for in situ remediation of recalcitrant organohalide-contaminated sediments. However, how sorbent ...
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