Related Experiment Video
Updated: Aug 13, 2026
09:11
Evaluating the Impact of Hydraulic Fracturing on Streams using Microbial Molecular Signatures
Published on: April 4, 2021
Decipher hydrological-ROS-mineral-microbe geochemical interaction and groundwater table fluctuation governing
Wenbing Wang1, Zhaojing Yu2, Qifeng Fan2
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China; School of GeoSciences, University of Edinburgh, Edinburgh, EH9 3FF, UK.
Water Research
|August 11, 2026
Summary
Groundwater table fluctuations and soil lenses alter per- and polyfluoroalkyl substances (PFAS) fate. Unsaturated conditions enhance microbial removal of GenX and PFOA, with dynamic water tables disproportionately impacting PFOA.
Area of Science:
- Environmental Chemistry
- Geochemistry
- Microbiology
Background:
- Complex heterogeneous media with soil lenses and fluctuating unsaturated conditions present challenges in understanding per- and polyfluoroalkyl substances (PFAS) transformation.
- Quantitative data on the distinct hydrological-reactive oxygen species (ROS)-mineral-microbe interactions governing long-chain PFOA and short-chain GenX is lacking.
Purpose of the Study:
- To decipher the geochemical interactions controlling GenX and PFOA transformation under dynamic hydrological conditions.
- To quantify the differential plume evolution of PFOA versus GenX in heterogeneous aquifers with soil lenses and fluctuating water tables.
Main Methods:
- Integration of real-time molecular probes, large language models (LLM), ROS identification systems, and high-throughput sequencing.
- Application of a multi-model framework including pp-QSPR, Hydrus inversion, and COMSOL forward modeling.
- Investigation of microbial communities and geochemical factors influencing PFAS degradation.
Main Results:
- Microbial activity and FeₓS<0xE1><0xB5><0xA7> interactions generate ROS (·OH, O₂·⁻, ¹O₂), with unsaturated conditions favoring O₂·⁻ and ¹O₂.
- Unsaturated conditions enhanced Fe²⁺ release and microbial cooperation, leading to greater GenX and PFOA removal compared to saturated conditions.
- Specific microbial communities (e.g., Pseudomonas, Methanobacterium for GenX; Pseudomonas, Acinetobacter for PFOA) were identified as key players in PFAS transformation.
- Soil lenses promoted horizontal GenX transport, while groundwater table fluctuation (GTF) amplified plume evolution, disproportionately affecting PFOA, with high-amplitude GTF significantly increasing PFOA flux and concentration.
Conclusions:
- Hydrological-ROS-mineral-microbe synergies are crucial for understanding and managing PFAS in complex subsurface environments.
- The chain length of PFAS influences their transport and transformation, necessitating chain-length-dependent management strategies.
- Dynamic groundwater tables and soil lenses significantly alter PFAS fate and transport, requiring integrated modeling approaches for effective remediation.
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