Phytoremediation has become a proven, low-impact technique for the recovery of contaminated soils and waters. At Litoclean, we apply this natural strategy in combination with advanced testing at our Innovation Center (CIL) and the expertise gained from European projects such as Phy2Climate.
What is Phytoremediation?
Phytoremediation is a bioremediation technique that uses plants and microorganisms associated with their roots to eliminate, immobilize, or transform contaminants present in soils, water, and sediments. It is an in situ, low-cost solution with minimal environmental disruption.
Types of Phytoremediation and Their Applications
Each type of phytoremediation is suited to specific contaminants and environmental conditions:
Phytoextraction
This involves the absorption of contaminants—mainly metals such as lead, cadmium, or zinc—by plant roots. These elements are transported and accumulated in the aerial biomass. The plants can then be harvested and, in some cases, processed through phytomining to recover valuable elements.
Phytostabilization
Through this mechanism, roots immobilize contaminants in the soil or bind them within plant structures, reducing their mobility and bioavailability. This prevents their spread to groundwater or entry into the food chain.
Rhizodegradation
In the rhizosphere—the soil zone surrounding the roots—plants exude compounds that stimulate the activity of microorganisms specialized in degrading organic pollutants. This plant-microbe symbiosis is key to eliminating pesticides, hydrocarbons, or solvents.
Phytovolatilization
Certain plant species transform specific contaminants into less toxic volatile compounds, which are released into the atmosphere through their leaves. Although this technique requires special caution, it can be useful for elements such as mercury or selenium.
Phytofiltration
Particularly effective in contaminated water, where roots act as living filters that adsorb or absorb contaminants in aqueous solutions, including metals, nutrients, or organic compounds.
Advantages and Limitations of Phytoremediation
Key advantages of phytoremediation include:
- Low cost and minimal energy requirements
- Integration of natural solutions without major environmental disruption
- Potential recovery of metals or useful biomass in certain cases
- Avoidance of transporting contaminated soil, minimizing environmental impact
However, it also has some limitations:
- Effectiveness is limited to the depth reached by plant roots
- Requires longer treatment times compared to physico-chemical technologies
- Proper management of accumulator biomass is essential to prevent its entry into the food chain
A Field in Constant Evolution
Research in phytoremediation is advancing rapidly, incorporating innovative approaches such as genetic engineering of plant species, electro-phytoremediation, and integration with other in situ bioremediation technologies. Efforts are also underway to identify new hyperaccumulator plants capable of adapting to various climates and contaminant types.
Proven Success Case: European Project Phy2Climate
Litoclean participated in Phy2Climate, a project that combined phytoremediation with biofuel production from the generated biomass. This initiative involved experts from various disciplines and case studies in Spain, Serbia, Lithuania, and Argentina. Biomass processing at a biorefinery was centralized in Germany. This approach promoted circularity by integrating environmental recovery with renewable energy generation.
Do you want to know more about this project?
The European Phy2Climate project on phytoremediation kicks off in Tarragona
Phy2Climate achieves major breakthroughs in its second year
Phy2Climate approaches its conclusion with promising results in phytoremediation and biofuels
