Bacteria living on foam cubes digest toxic solvent fumes
Li P, Li L, Wang W, Han Y, Zheng T
Phytoremediation
The same kind of bacterial teamwork that breaks down this industrial solvent is at work in your garden soil right now, quietly digesting pollutants and feeding nutrients back to your plants' roots.
Scientists packed a filter with foam cubes and let bacteria grow on them like a living sponge, then used it to clean a nasty industrial chemical called o-xylene out of polluted air. The bacteria on the foam turned most of the chemical into carbon dioxide and used the rest as food, with three types of bacteria doing most of the work. It's a neat example of how microscopic life forms a cleanup crew whenever given a surface to cling to and something toxic to eat.
Key Findings
The biofilter achieved a maximum o-xylene removal capacity of 35.36 g/(m3·h) at a 76-second residence time, with about 64% of the carbon mineralized to CO2.
Bacteria living in the surface biofilm (versus floating in the circulating liquid) showed 22.3% greater enrichment of pollutant-degradation pathways, with the xylene-specific pathway enriched 1.33-fold.
Pseudomonas, Mycobacterium, and Comamonas were identified as the key bacterial genera driving degradation, using purely aerobic (oxygen-based) breakdown routes feeding into the cell's main energy cycle.
chevron_right Technical Summary
Researchers built a biofilter using foam cubes coated with bacteria to clean o-xylene, a toxic solvent vapor, from industrial air, destroying about 64% of it into harmless CO2 and breaking the rest down through natural bacterial digestion pathways.
Abstract Preview
Original paper
Physicochemical and microbial metabolic insights into o-xylene biotransformation mediated by catechol-type intermediate pathways in porous-packed biofilter.
In this study, gaseous o-xylene was removed using a laboratory-scale biotrickling filter packed with polyurethane foam cubes. The maximum elimination capacity of 35.36 g/(m3·h) can be achieved at a...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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