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Diffuse emission and control of copper in urban surface runoff
1EAWAG, Swiss Federal Institute for Environmental Science and Technology, Duebendorf.
Summary
Diffuse copper pollution from urban runoff can be managed using granulated iron-hydroxide (GEH) adsorption systems. These systems effectively retain copper from roof and façade runoff, protecting soils and water.
Area of Science:
- Environmental Science
- Water Quality Management
- Urban Hydrology
Background:
- Copper from building materials is a significant source of diffuse urban pollution.
- Sustainable strategies require replacing copper-based materials, but interim solutions are needed.
- Urban stormwater management increasingly relies on decentralized infiltration systems.
Purpose of the Study:
- To evaluate an adsorber system for retaining copper from urban runoff.
- To assess the performance of granulated iron-hydroxide (GEH) and calcium carbonate mixtures.
- To provide full-scale data on copper façade runoff and adsorption trench effectiveness.
Main Methods:
- Investigated copper runoff from a large copper façade.
- Treated façade runoff using an adsorption trench with GEH layers.
- Monitored copper concentrations before and after treatment over one year.
Main Results:
- Façade runoff contained average copper concentrations of 1-10 mg/l.
- The adsorption trench achieved 96-99% reduction in copper concentrations.
- Demonstrated the efficacy of GEH adsorption for copper removal in infiltration sites.
Conclusions:
- GEH adsorption systems are effective for managing diffuse copper pollution from urban runoff.
- Adsorption trenches offer a viable solution for copper retention in decentralized stormwater infiltration.
- The study provides crucial full-scale data supporting the use of GEH for environmental protection.