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Bioremediation process for sediments contaminated by heavy metals: feasibility study on a pilot scale
H Seidel1, C Löser, A Zehnsdorf
1UFZ Centre for Environmental Research Leipzig-Halle, Department of Remediation Research, Permoserstrasse 15, D-04318 Leipzig, Germany. Heinz.Seidel@ufz.de
Environmental Science & Technology
|March 30, 2004
Summary
This study demonstrates a two-stage sediment remediation process using plant conditioning and microbial bioleaching. The method effectively removes heavy metals from polluted river sediment, offering a viable solution for sediment restoration.
Area of Science:
- Environmental Science
- Microbiology
- Soil Science
Background:
- Highly polluted river sediments pose significant environmental risks.
- Effective remediation strategies are crucial for restoring aquatic ecosystems.
- Conventional methods often face challenges with efficiency and cost.
Purpose of the Study:
- To evaluate a pilot-scale sediment remediation process.
- To assess the efficacy of plant conditioning and microbial bioleaching for heavy metal removal.
- To determine the cost-effectiveness of the proposed remediation technique.
Main Methods:
- Pilot-scale testing of sediment remediation.
- Plant conditioning of dredged sludge in 50 m3 basins using reed canary grass.
- Solid-bed bioleaching of heavy metals using microbially produced sulfuric acid in a 2000 L reactor with 2% sulfur addition.
Main Results:
- Plant conditioning transformed anoxic sludge into permeable, soil-like oxic material.
- Bioleaching removed 61-81% of Zn, Cd, Mn, Co, and Ni within 21 days.
- Copper removal was 21%, while Chromium and Lead showed limited mobility.
Conclusions:
- The combined plant conditioning and microbial bioleaching process is effective for remediating polluted sediments.
- The process shows promise for restoring sediments for beneficial reuse.
- Cost-effectiveness suggests practical applicability for environmental management.