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Biochar Addition Enhances Phenanthrene Fixation in Sediment
Ying-Heng Fei1,2,3, Yuxiao Chen1, Chengshuai Liu4
1Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
Bulletin of Environmental Contamination and Toxicology
|January 3, 2019
Summary
Biochar effectively stabilizes phenanthrene in sediment, reducing contaminant release. This study shows biochar enhances pollutant adsorption and fixation, even with sediment aging.
Area of Science:
- Environmental Science
- Soil Science
- Environmental Chemistry
Background:
- Biochar shows potential for soil contaminant stabilization due to its high adsorption capacity.
- Research on biochar's efficacy in sediment remediation, particularly considering aging effects, is limited.
Purpose of the Study:
- To investigate the performance of plant biomass-derived biochar in remediating phenanthrene-polluted sediment.
- To evaluate the impact of biochar addition on phenanthrene adsorption and stability during sediment aging.
Main Methods:
- Phenanthrene-polluted sediment was amended with biochar and incubated for 60 days.
- Phenanthrene partition coefficients and adsorption isotherms were analyzed.
- Extreme extraction using a strong surfactant was employed to assess contaminant release.
Main Results:
- Sediment aging increased phenanthrene's partition coefficient, with or without biochar.
- Biochar addition significantly increased partition coefficients and resulted in more curved adsorption isotherms, indicating enhanced retention.
- Biochar amendment reduced phenanthrene release ratio from 60% to 5% under extreme extraction.
Conclusions:
- Biochar is applicable for enhancing organic pollutant adsorption in sediments.
- Biochar application leads to stable fixation of adsorbed pollutants during the aging process due to increased affinity.
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