In a global context marked by the need to combat pollution and preserve natural resources, bioremediation is emerging as a key technology to restore degraded environments.
This environmental technology, based on the use of microorganisms, offers effective and environmentally friendly solutions to address problems such as soil, water and sediment pollution. Its potential to transform sectors such as environmental management and ecosystem protection makes it an essential element to move towards a more sustainable future.
What is bioremediation and what role do microorganisms play in it?
Bioremediation is a biotechnological process that uses microorganisms, such as bacteria, fungi or microalgae, to degrade pollutants present in the environment.
These living organisms act as “natural cleaners” that metabolise toxic compounds, such as petroleum-derived hydrocarbons and other organic pollutants, and transform them into less harmful or completely inert substances. This technique can be applied directly to the contaminated site (in situ) or in controlled facilities (ex situ), offering great versatility to address different types of pollution.
This method stands out for being a sustainable alternative to chemical or thermal treatments, as it takes advantage of natural biological processes and minimises environmental impact. Organisations such as the European Environment Agency have recognised bioremediation as a viable solution to restore ecosystems without generating secondary waste or consuming large amounts of energy.
Bioremediation with microorganisms vs conventional techniques
Traditional decontamination techniques, such as thermal treatment of contaminated soils or the use of chemicals, are often expensive, require high energy consumption and can significantly alter ecosystems.
In contrast, bioremediation takes advantage of the natural ability of microorganisms to degrade pollutants, offering a more environmentally friendly and more economically affordable approach. This process can be optimised through techniques such as bioaugmentation, which introduces microorganisms selected for a specific metabolic transformation, or biostimulation, which improves environmental conditions to favour the activity of the microorganisms present.
This methodology allows a wide range of pollutants to be treated, from the removal of petroleum-derived hydrocarbons or organochlorine solvents to the mobilisation of heavy metals such as mercury or cadmium.
In addition, bioremediation not only removes pollutants, but can also contribute to the regeneration of ecosystems, improving soil health in terms of fertility and organic matter content, as well as groundwater and surface water quality.
A new horizon for environmental and waste management
Bioremediation offers transformative opportunities to address global environmental challenges. In the field of waste management, this technology makes it possible to treat industrial effluents and recover soils contaminated by mining or industrial activities. It also plays a key role in protecting water resources, removing organic pollutants and excessive nutrients from wastewater.
In addition, its application in the restoration of degraded ecosystems contributes to preserving biodiversity and ensuring the safety of affected areas for future uses.
From an environmental point of view, bioremediation significantly reduces the environmental impact compared to conventional methods. It is capable of reducing greenhouse gas emissions associated with decontamination by up to 80%, while promoting the circular economy by generating useful by-products, such as biomass or bioactive compounds, from polluting waste.
In this sense, for bioremediation to consolidate itself as a transformative tool, it is essential to translate scientific discoveries into practical and scalable solutions for industry.
Applied bioremediation: sustainable technologies to recover contaminated soils and waters
Eurecat leads this effort through innovative projects that combine microbiology and engineering to develop more efficient and sustainable bioremediation processes.
Our goal is to create solutions that not only solve environmental problems but are also viable for companies and have a positive impact on society
—Xavier Martínez Lladó, head of Eurecat’s Water, Air and Soil Technology Unit.
Fungi and bacteria to recover contaminated soils
One of the most prominent projects is LIFE MySOIL, which has explored the use of fungi to degrade petroleum-derived hydrocarbons in contaminated soils. This project has combined the biological activity of fungi with organic substrates to accelerate decontamination processes, reducing both time and costs compared to conventional methods.
The results of LIFE MySOIL have shown that fungi can help recover contaminated soils in real conditions. In three pilot tests in Spain, France and Italy, the technology managed to reduce the oil hydrocarbons present in the soil by between 40% and more than 70%. In addition, the treatment improved soil health and reduced environmental impact and costs compared to more intensive techniques, such as thermal desorption.
LIFE MySOIL has demonstrated the potential of the joint activity of bacteria and fungi to tackle complex problems such as oil spills, with an approach that prioritises sustainability and the circular economy
—Carme Bosch, responsable de línea de investigación en suelos y aguas subterráneas de Eurecat.
More recently, LIFE InBioSoil takes a step forward in soil decontamination with bioremediation technology applied directly to the subsoil and without the need to excavate or transport contaminated soil. The project tests the low-pressure injection of specific fungi and bacteria capable of degrading petroleum-derived hydrocarbons.
This approach reduces pollutants, costs, waste and emissions compared to conventional treatments, and opens the door to more sustainable and less invasive soil restoration.
Microalgae to treat groundwater
In the field of water, LIFE SPOT has expanded the scope of biological solutions with a technology based on microalgae biofilters and cork filtration to remove nitrates and pesticides from groundwater.
Unlike reverse osmosis, which despite being efficient generates brine waste that is difficult to manage, especially in isolated areas, the technology developed in the LIFE SPOT project transforms pollutants into usable biomass for uses such as fertilisers or biogas.
Thus, it is positioned as a circular, self-sufficient and economically competitive alternative to guarantee quality water in rural areas or areas with limited infrastructure.
Challenges and prospects for the future
Despite its enormous potential, bioremediation still faces several challenges to consolidate itself as a technology fully integrated into industry and society. One of the main obstacles is scalability, as biological processes can be slower than conventional methods and require specific conditions to be effective.
In addition, the variability of pollutants and affected environments requires adapted solutions, which can increase initial costs. However, advances in technologies such as metagenomics and artificial intelligence are helping to overcome these barriers, improving efficiency and reducing costs.
Another challenge is public perception and regulation. In some countries, the use of genetically modified microorganisms may generate reluctance, and strict regulations may limit the application of these technologies. According to the World Economic Forum, ensuring consumer education and establishing clear regulatory frameworks will be key for bioremediation to reach its full potential.
Bioremediation is not only a scientific revolution, but a strategic tool to address major environmental challenges: combating pollution, preserving natural resources and promoting a sustainable development model.
