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Heavy metal fates in laboratory bioretention systems
1Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742, USA.
Chemosphere
|September 29, 2006
Summary
Bioretention facilities capture most heavy metals in soil, with minimal accumulation in plants. Increased plant biomass is needed for vegetation to significantly impact metal removal and extend facility life.
Area of Science:
- Environmental Engineering
- Soil Science
- Plant Science
Background:
- Bioretention facilities are crucial for managing heavy metals in urban runoff.
- Understanding the fate of heavy metals within these systems is essential for effective design and maintenance.
Purpose of the Study:
- To investigate the accumulation and distribution of heavy metals (copper, cadmium, lead, zinc) in plant tissues and soil media within simulated bioretention systems.
- To determine the percentage of metals captured by soil, lost from the system, and accumulated by plants.
Main Methods:
- Pot prototypes filled with bioretention media were used to simulate natural plant growth conditions.
- Synthetic runoff containing varying loads of copper, cadmium, lead, and zinc was periodically applied.
- Metal concentrations in plant tissues (Panicum virgatum, Kentucky-31, Bromus ciliatus) and soil media were analyzed after 230 days.
Main Results:
- Plant tissue metal concentrations followed the trend Zn > Cu > Pb > Cd, mirroring input concentrations.
- Bioretention media captured 88-97% of input metals in the soil.
- Only 0.5-3.3% of input metals accumulated in plant tissues, with 2.0-11.6% not captured by the media.
Conclusions:
- Soil media are the primary sink for heavy metals in bioretention systems.
- Plant uptake of heavy metals is limited, especially with low biomass production.
- Enhancing vegetation biomass density is necessary for plants to play a significant role in heavy metal removal and extending bioretention facility lifespan.
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