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Innovative and effective landscape design to decontaminate and add value to polluted sites

Transforming public spaces with plants that decontaminate soils can add functional, ecological, economic and social value to derelict areas. A new study calls for consideration of social and environmental factors, as well as remediation needs, to produce effective and innovative landscape design.

Land contaminated by urbanisation and industrialisation can present substantial health and environmental problems. There are potentially 3.5 billion such contaminated sites in the EU, and thorough remediation is necessary to prevent pollutants leaching into groundwater or accumulating in food crops. An innovative method of remediation, which could provide a cost-effective and environmentally-friendly solution is ‘phytoremediation’, the use of plants to decontaminate polluted environments.

Researchers in the Netherlands tested the feasibility of phytoremediation in Buiksloterham, a polluted and deprived industrial area in Amsterdam-North. Plans to transform the site into a mixed residential and commercial centre are currently limited by a high concentration of heavy metal pollutants in the soil.

Combining the need to remediate the area with social and environmental concerns, the researchers produced a landscape design for Buiksloterham. Plants were chosen to transform the public space in a way that would be productive, as well as aesthetically pleasing. A group of plant species were chosen that collectively would break down heavy metal pollutants, trap pollutants in plant tissue and prevent their migration in the soil. Pollutants not broken down by the plants can be removed from the site by harvesting the plant material.

Soil reports and estimated timescales for phytoremediation showed that the time to clean up certain heavily polluted areas of the site in situ would conflict with the proposed timescale for urban development. Innovative solutions to this problem included transporting the heavily-polluted soils to canal barges where they would form ‘floating gardens’, or onto road sides where they would act as lush streetscapes, while undergoing long-term phytoremediation.

For the full article use the link below

Science for Environment Policy - European Commission 

http://ec.europa.eu/environment/integration/research/newsalert/pdf/328na1rss.pdf