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Evaluating iron remediation with limestone using spectral induced polarization and microscopic techniques
Na Hao1, Jianshe Ye1, Li Zhao1
1MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China.
The Science of the Total Environment
|August 24, 2021
Summary
Spectral induced polarization (SIP) effectively monitored iron remediation using limestone, tracking precipitate formation and growth. This non-destructive technique shows promise for assessing permeable reactive barrier performance in groundwater cleanup.
Area of Science:
- Environmental Science
- Geochemistry
- Geophysics
Background:
- Groundwater contamination by iron from mining and landfills necessitates effective remediation.
- Permeable reactive barriers (PRBs) offer a cost-effective solution for subsurface remediation.
- Spectral induced polarization (SIP) is a non-destructive geophysical method for monitoring subsurface processes.
Purpose of the Study:
- To apply SIP for monitoring iron remediation using limestone in a column study.
- To investigate the geochemical changes and precipitate formation during iron remediation.
- To evaluate the capability of SIP in assessing the performance of engineered barriers.
Main Methods:
- Column-scale experiments simulating iron remediation.
- Chemical analysis to determine pH and precipitate composition (XPS, SEM).
- Micro computed tomography (CT) for precipitate distribution analysis.
- Spectral induced polarization (SIP) for monitoring geochemical processes.
Main Results:
- Limestone dissolution increased pH, promoting iron precipitation as γ-FeOOH and Fe₂O₃.
- Micro-CT revealed preferential flow paths and uneven precipitate distribution.
- SIP accurately quantified accumulated iron precipitates, correlating with chemical measurements.
- SIP provided insights into precipitate crystal growth and aggregation dynamics.
Conclusions:
- SIP is a promising technique for non-destructively monitoring iron remediation processes in porous media.
- SIP can effectively track the quantity, size, and distribution of iron precipitates.
- The study validates SIP's potential for assessing the long-term performance of engineered barriers in groundwater remediation.
