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Column study on Cr(VI)-reduction using the brown seaweed Ecklonia biomass.
Donghee Park1, Yeoung-Sang Yun, Dae Sung Lee
1Advanced Environmental Biotechnology Research Center, Pohang University of Science and Technology, Pohang 790-784, South Korea.
Journal of Hazardous Materials
|May 2, 2006
Summary
Brown seaweed Ecklonia biomass effectively reduces toxic hexavalent chromium (Cr(VI)) in a packed-bed column. Optimal conditions include low pH and high temperature for efficient Cr(VI) detoxification.
Area of Science:
- Environmental Science
- Bioremediation
- Chemical Engineering
Background:
- Hexavalent chromium (Cr(VI)) is a toxic heavy metal pollutant.
- Effective and sustainable remediation methods are needed.
- Brown seaweed Ecklonia offers potential as a bioremediating agent.
Purpose of the Study:
- To investigate Ecklonia biomass as a bioreductant for Cr(VI) removal.
- To evaluate the impact of operating parameters on Cr(VI) reduction efficiency.
- To model and predict the performance of a packed-bed column for Cr(VI) detoxification.
Main Methods:
- Continuous packed-bed column experiments.
- Systematic variation of influent Cr(VI) concentration, pH, biomass concentration, flow rate, and temperature.
- Neural network modeling for breakthrough curve prediction.
Main Results:
- Increased Cr(VI) concentration and flow rate, and decreased biomass concentration led to higher Cr(VI) breakthrough.
- Lower influent pH and higher temperature significantly enhanced Cr(VI) reduction.
- Neural network model effectively predicted column breakthrough curves.
Conclusions:
- Ecklonia biomass is a viable bioreductant for Cr(VI) removal.
- Optimizing pH and temperature is crucial for efficient Cr(VI) detoxification.
- The packed-bed column system demonstrates potential for industrial Cr(VI) remediation.