Bioremediation of α-terpineol-contaminated flotation wastewater using biochar-immobilized biosurfactant-producing bacteria.
Ye JC, Liu YX, Du H, Xie YQ, Xiang L
Phytoremediation
Mining runoff laced with flotation chemicals can leach into the same watersheds that feed your garden hose and the streams where wild watercress grows — this bacterial cleanup method offers a way to intercept that contamination before it reaches your soil.
A toxic chemical used in mining to separate minerals from rock ends up in wastewater and is very hard to break down naturally. Scientists found a soil bacterium that can eat this chemical and made it work even better by attaching it to biochar — a charcoal-like material made from plant matter. The biochar-bacteria duo cleaned up more than 85% of the toxic mess from real mining wastewater, even in harsh conditions with heavy metals present, and kept working across multiple cleaning cycles.
Key Findings
The bacterium Pseudomonas asiatica S4 removed over 90% of 1000 mg/L α-terpineol within 48 hours using self-produced biosurfactants to make the chemical more accessible.
When immobilized on biochar, the system achieved over 85% removal of both α-terpineol and chemical oxygen demand from real alkaline mining wastewater (pH 9.5) containing multiple heavy metals within 11 days.
Biochar protection upregulated the bacteria's breakdown genes by 2- to 8.7-fold and sustained performance across multiple treatment cycles, outperforming free-floating bacteria or biochar alone.
chevron_right Technical Summary
Researchers engineered a cleanup system for mining wastewater by coating bacteria onto biochar (charred wood/plant material). The bacteria break down a toxic chemical called α-terpineol — used in mineral mining — removing over 85% of it and other pollutants from real industrial wastewater within 11 days.
Abstract Preview
α-Terpineol, a persistent and toxic frother in mineral flotation wastewater, poses significant environmental risks due to its resistance to natural degradation and potential to elevate chemical oxy...
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