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Biostabilization of cadmium contaminated sediments using indigenous sulfate reducing bacteria: Efficiency and process
Weihua Peng1, Xiaomin Li1, Tong Liu1
1School of Space and Environment, Beihang University, No. 37, XueYuan Road, HaiDian District, Beijing 100191, PR China.
Chemosphere
|March 17, 2018
Summary
Sulfate-reducing bacteria (SRB) effectively stabilized cadmium (Cd) in sediments. This bio-treatment reduced Cd in interstitial water by up to 96.4% and increased stable Cd fractions.
Area of Science:
- Environmental microbiology
- Geochemistry
- Bioremediation
Background:
- Cadmium (Cd) contamination in sediments poses environmental risks.
- Sulfate-reducing bacteria (SRB) show potential for heavy metal stabilization.
Purpose of the Study:
- To investigate the efficacy of SRB bio-treatment for stabilizing Cd in contaminated sediments.
- To understand the role of bacterial communities in Cd mobilization and stabilization.
Main Methods:
- Sediments were spiked with Cd and treated with SRB for 166 days.
- Cd speciation, mobilization index, and interstitial water Cd content were analyzed.
- Bacterial community composition was assessed using molecular techniques.
Main Results:
- SRB bio-treatment significantly reduced Cd in interstitial water (77.6-96.4%) and increased stable Cd fractions.
- Initial Cd mobilization occurred within the first 32 days of treatment.
- Bacterial community richness, diversity, and SRB abundance (Desulfobacteraceae, Desulfobulbaceae) were enhanced.
Conclusions:
- SRB bio-treatment is a viable method for stabilizing Cd in sediments.
- Bacterial community dynamics are crucial for understanding Cd biogeochemical cycling.
- Cd speciation and environmental factors influence bacterial community structure and function.
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