PubMed · 2026-03-12
Researchers combined mild heating (35-40°C) with an oil-based nutrient amendment to clean up groundwater contaminated with industrial solvents and fuel chemicals simultaneously, demonstrating that the right temperature range is critical for microbial communities to break down both pollutant types at once.
Heating groundwater to 35-40°C combined with emulsified vegetable oil amendment enabled simultaneous biodegradation of both chlorinated solvents and fuel chemicals (BTEX), while temperatures of 45°C inhibited degradation of both pollutant types.
At 30°C in lab experiments, solvent breakdown increased 2.2-fold over controls, but benzene degradation did not improve significantly, highlighting that different microbial communities have different temperature tolerances.
In the field pilot, the ratio of a key dechlorination gene (vcrA) increased markedly, providing molecular evidence of complete breakdown of the most toxic chlorinated compounds — a result not replicated in smaller lab experiments.