OUR WORKS

What We Do

PHY4’s work is built around two complementary areas: environmental science and Nature-based Solutions, and stakeholder and participatory approaches.

Science for Ecosystems

Environmental Science & Nature-based Solutions

We develop and apply environmentally sustainable approaches for remediation, water treatment, ecosystem management and environmental monitoring.

Key Focus Areas

Phytoremediation

Phytoremediation is an environmentally friendly technology that uses plants and associated microorganisms to remediate soils, water and air contaminated by organic pollutants, such as solvents, pesticides and hydrocarbons, as well as inorganic pollutants, including heavy metals. It relies on natural processes such as root uptake, microbial degradation within the rhizosphere and volatilisation.

Key Advantages

Limitations

Technologies and Applications

Phytoremediation uses plants and microorganisms to remediate contaminated soils and water through a range of strategies, including rhizofiltration, constructed wetlands (CWs), phytostabilisation, phytoextraction, phytodegradation and phytovolatilisation.

Constructed wetlands, consisting of substrates such as sand and gravel combined with aquatic vegetation including Phragmites and Typha, can be highly effective in removing nutrients and contaminants, with performance influenced by biodiversity and system design.

Phytoextraction uses hyperaccumulator species or fast-growing plants to remove heavy metals from contaminated substrates. Phytostimulation promotes pollutant degradation through microorganisms associated with the rhizosphere, while poplars and willows are particularly suitable for phytodegradation and phytovolatilisation.

The main advantages are low costs, sustainability and environmental co-benefits. Key limitations include long treatment times and sensitivity to environmental conditions. Current research is increasingly focusing on integrated approaches, including the use of chelating agents, genetically modified plants and native species in constructed wetlands and buffer strips, with successful applications already reported in Europe and North America.

Constructed Wetlands

PHY4 designs, implements and maintains Constructed Wetlands (CWs): natural, sustainable and cost-effective systems for wastewater treatment, stormwater management and environmental restoration.

Constructed wetlands can provide:

Natural treatment of municipal, agricultural and industrial wastewater.
Removal of pollutants, including organic contaminants, nutrients, metals and bacteria.
Stormwater management and support for flood-risk reduction.
Remediation of contaminated sites and treatment of complex discharges.

NATURE-BASED REMEDIATION

Phytocapping

Phytocapping is a nature-based remediation technology that uses selected plant species to contain and, where possible, support the degradation of pollutants in landfills and contaminated soils, reducing their migration towards groundwater and the atmosphere.

It can provide an environmentally sustainable and cost-effective alternative to conventional approaches such as synthetic membranes, excavation and disposal. In suitable contexts, substantial cost savings may be achieved due to reduced material requirements, lower maintenance needs and the avoidance of contaminated-soil disposal costs.

PHY4 Comprehensive Support

Compared with conventional treatment systems, constructed wetlands can offer lower energy consumption, reduced operating costs and simpler maintenance, while also creating habitats for biodiversity and integrating effectively into the surrounding landscape.

They can be applied in municipal and rural areas, agricultural settings, industrial sites and environmental restoration projects. PHY4 develops site-specific solutions, with targeted selection of substrates and vegetation, supported by monitoring and ongoing technical assistance.

Biomonitoring

Biomonitoring uses living organisms as bioindicators to assess environmental quality and the effects of human activities on ecosystems. Unlike conventional physico-chemical analyses, it can provide an integrated and dynamic assessment of environmental conditions and reveal changes that may not always be detected through traditional monitoring methods alone.

Biomonitoring is particularly valuable for understanding ecosystem condition and functioning, as it can support the early detection of pollutants at very low concentrations, reveal cumulative effects from multiple contaminants, use biodiversity as an indicator of ecological balance, and enable the monitoring of large areas in an efficient and cost-effective manner.

Key Objectives

Practical examples include the use of algae to assess industrial water discharges, worms and plants to monitor landfill leachate impacts, and bees as bioindicators of agricultural-environmental quality.

PHY4 applies biomonitoring approaches to both public and private systems, drawing on current scientific methods and integrating biological evidence with wider environmental assessment.

COLLABORATIVE GOVERNANCE

Stakeholder, Risk & Participatory Approaches

Environmental challenges are not solely technical. Their management also depends on how risk is understood, how evidence is communicated and how different actors contribute to the development and implementation of solutions.

Key Focus Areas

Science Translation

Risk Communication

We work on how people understand, interpret and respond to risk, particularly when scientific evidence is complex, uncertain or difficult to translate into everyday decisions.

Our approach combines risk perception research with communication design, preparedness and evaluation.

Our Core Methods

Risk Perception & Audience Analysis Understanding risk perceptions, information needs and trust.
Tailored Communication Strategies Communicating complex evidence and uncertainty clearly.
Serious Games & Interactive Learning Exploring risk scenarios through engaging, interactive tools.
Preparedness & Evaluation Strengthening preparedness and assessing communication effectiveness.

From Scientific Evidence to Meaningful Action

We examine what information different audiences need, how they make sense of it, which sources they trust, and how uncertainty can be communicated clearly without oversimplifying the science.

Depending on the context, our work may involve risk perception studies, communication strategies, educational and interactive formats, preparedness activities, serious games, scenario-based exercises and the assessment of communication effectiveness.

The aim is not simply to make scientific information more accessible, but to make it more meaningful and usable for the people who need to act on it.

COLLABORATIVE INQUIRY

Participatory Approaches & Co-creation

We use participatory approaches when complex problems cannot be adequately understood or addressed from a single perspective. Our work integrates scientific expertise with professional, institutional and local knowledge through structured processes of dialogue, experimentation and collaborative learning.

Our Core Methods

From Participation to Meaningful Solutions

Our participatory methods go beyond traditional consultation, enabling stakeholders to contribute directly to the exploration, development and evaluation of ideas, tools and solutions.

Depending on the context, we combine workshops, scenario-based activities, simulations, counterfactual exercises and other interactive formats to encourage critical reflection and knowledge exchange.

For PHY4, co-creation does not mean replacing scientific expertise with consensus. It means creating structured opportunities for different forms of knowledge to challenge and complement one another, leading to solutions that are scientifically robust, context-sensitive and grounded in real-world needs.