Citizen science urban mining: decontamination of soils

Phytomining is a known phenomenon indicating the ability of some plants to collect and transfer to their aerial section a high concentration of metals from the soils they are growing in. Many studies have approached this plant capability in highly contaminated soils and evaluated their potential for soil remediation and decontamination.

We are now interested in utilising some of these plants to “clean up” the metals present in garden and allotments due to anthropogenic activities such as transports, industry emissions, construction etc. In the summer of 2020, we carried out the first round of trials, our “Friends and Family” trial, to evaluate the feasibility of our scientific concept.

The main aim of our trial was to understand the potential of domestic soil regeneration using a specific mix of metal-collecting plants – grasses and flowers.

The objectives of the trial were to:

• Understand the type, concentration and the potential sources of soil contaminants in our domestic settings;
• Evaluate the ability of a mix of metal-collecting plants to cope with different soils and contaminants exposure; and
• Assess the yield of metals absorbed by the plants
• Gain experience in the logistics of seeds supply and provision of analysis for domestic applications.

After the trial, we gathered comments from the participants to adjust the mixture of metal-collecting plants (to improve diversity, yield, aesthetics, resilience and invasiveness of the selected plants). All the results are being processed, to provide information back to our participants and eventually for (anonymised) publication to the public.

We are now ready to start a much larger trial! This second trial will follow a Citizen Science approach and will aim to:

• Widen the understanding of soil contamination types and sources within the UK;
• Investigate the behaviour of our plant mixes at different latitudes and further assess the plants ability to thrive in different soils and contaminants concentration;
• Optimise our plant mixes to ensure that all metals are collected in the aerial part of the plant to allow for easy harvesting;
• Provide a visual assessment of the soil contamination through the use of flowering plants that change the colour of their flowers depending on the type of metal present in the soil (similarly to hydrangea);
• Understand if and how we could create a self-sustaining commercial business to provide soil regeneration services for gardeners and allotment users;
• Assess and improve the metal yields accumulated by the plants;
• Evaluate the potential for the creation of a sustainable resource of specialist metals while cleaning our gardens.

With a citizen science approach, we intend that all the participants will be co-scientists within the project. All the data, feedbacks and resources that participant gather and share is of uttermost importance to understand the overall results. Such information gathered and shared with the help of participants constitutes open science, an ideology that is imperative in driving such a far-reaching endeavour where we hope to balance the need to unravel such a complex matter while encouraging inclusiveness for all as we plan to evolve this service into a long term commercial venture.

All the data will be fully anonymised for scientific publications and the social media linked to the project will give room for debate and exchange of information between us and our co-scientists.

Support us and become a co-scientist

Our project is to develop a sustainable business that helps regenerate soils extracting metal contaminants using UK (or local) native plants and then harvest them and upcycle them to high value products.

The business will ensure natural metal recovery, resilient metal supply, and green methods for the upcycling of the products. Our group is committed to work on environmental improvements through responsible resourcing and manufacturing.

You can participate in our project by donating to our cause and receive rewards such as project booklets, seed packets, and your own grass or soil analysis.