Bronte Wells
Biofilms are an aggregation of microbial organisms that can form on various surfaces, including rocks, pebbles, plants, and even boat hulls. They are composed of bacteria, fungi, protozoa, and other microorganisms. Biofilms play an essential role in breaking down contaminants and pollutants, such as oil spills, heavy metals, and xenobiotics, through bioremediation. This process involves the biological adsorption, immobilization, and breakdown of pollutants by the microorganisms within the biofilm. In some cases, biofilms can have negative impacts, leading to persistent infections in hospital settings and biofouling on boat hulls. However, they also have beneficial applications, such as in wastewater treatment and the protection of marine ecosystems. Understanding the interactions between biofilms and pollutants is crucial for managing their potential risks and harnessing their capabilities for environmental remediation.
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What You'll Learn
- Biofilms can bind inorganic metallic elements and organic polymeric substances
- They can be used to bioremediate contaminated soil and groundwater
- Biofilms can help eliminate petroleum oil from the ocean
- They can form on microplastics, influencing their behaviour and potential risks
- Biofilms can be used to treat wastewater
Biofilms can bind inorganic metallic elements and organic polymeric substances
Biofilms are syntrophic communities of microorganisms that stick to each other and often to a surface. They are present in natural, industrial, and hospital settings. Biofilms can be used to remediate contaminated soil and groundwater, and they are also relevant for the improvement of metal dissolution in the bioleaching industry.
Extracellular polymeric substances (EPS) are key to biofilm development, contributing to the bacterium's adhesion and resistance to antimicrobial agents. EPS is composed of carbon compounds, which provide bacteria with nutrients. It also plays the role of a carbon reservoir, as it contains a large amount of carbon. In addition to carbon compounds, EPS contains extracellular polysaccharides, proteins, lipids, and DNA.
Biofilms can also incorporate organic polymeric substances from the outside environment. This is validated by the fact that biofilms can be used to remediate organic pollutants, pharmaceuticals, and personal care products. For example, biofilms have been used to treat water contaminated with oil spills, xenobiotics, and persistent organic pollutants.
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They can be used to bioremediate contaminated soil and groundwater
Biofilms are used in bioremediation to treat contaminated soil and groundwater. Bioremediation is the process of using biological organisms to remediate polluted environments. Biofilms are communities of microorganisms that can treat contaminated soil and groundwater through sorption and metabolization. This is achieved through the expression of genes governed by quorum sensing, which enhances bioremediation kinetics with the help of signalling molecules, the transfer of genetic material, and metabolites.
Biofilms can be used to remediate soil contaminated with flammable and moderately flammable organic substances. This is done through a process called bioslurping, which involves drawing liquid from the free product layer and lifting it to the surface, where it is separated from the surrounding air and water. This method is cost-effective as it uses less groundwater, requiring less storage, disposal, and treatment.
Biofilms are also used in bioventing, which is a technique that stimulates indigenous microflora through aeration to enhance the biodegradation ability of microbes and promote decontamination of heavy metal pollutants. This approach can be used to reach soil and groundwater levels for restoration. In situ bioremediation, a type of bioventing, has been used to treat clogged groundwater and decontaminate shallow, unsaturated soil.
Additionally, biofilms can be used to treat contaminated groundwater by removing trace amounts of pharmaceutical ingredients, such as birth control pills, anti-epileptics, pain relievers, and antidepressant medications, commonly found in groundwater sources. Genetically engineered plants can also be used in bioremediation to target specific pollutants through discovered metabolic processes, enzymes, genes, or operons.
Overall, biofilms play a crucial role in bioremediating contaminated soil and groundwater by transforming hazardous pollutants into harmless substances.
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Biofilms can help eliminate petroleum oil from the ocean
Oil spillage is one of the most common pollutants, causing significant economic loss and environmental damage. The damage can vary depending on the type of oil, the location of the spill, and the climatic parameters in thearea. For instance, the 2010 Deepwater Horizon explosion in the Gulf of Mexico, the largest marine oil spill in history, saw nearly 5 million barrels of oil spilled.
Biofilms can be used to help eliminate petroleum oil from the ocean. Biofilms are complex communities of microorganisms that are held together by slimy extracellular substances. They can form on virtually every non-shedding surface in non-sterile aqueous or humid environments, and they can grow in extreme environments. In the context of oil spills, biofilms can form on the surfaces of oil droplets, reshaping the droplets and accelerating the oil's degradation. This process is known as bioremediation, which is an environmentally friendly and cost-effective approach for marine biological restoration. It allows complex petroleum hydrocarbons in spilt oil to decompose completely into harmless compounds.
One example of a biofilm that can degrade crude oil is the Alcanivorax borkumensis species, also known as Alca. Alca can survive in the ocean solely from the consumption of hydrocarbons. It forms biofilms that deform oil drops and eat the hydrocarbons, or it can transform the drops into larger aggregate structures that sink to the seafloor. Another example is the Pseudomonas species, which has been shown to degrade crude oil more effectively and extensively than planktonic counterparts.
The use of biofilms for bioremediation is not limited to marine environments. They are also employed in the industry for the remediation of contaminated soil and groundwater. Additionally, beneficial biofilm formation can be encouraged in industrial and environmental areas through surface modification and QS signals.
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They can form on microplastics, influencing their behaviour and potential risks
Biofilms are assemblages of microorganisms that bind together and attach to surfaces. They can form on microplastics, influencing their behaviour and potential risks. Microplastics are a modern societal issue due to their persistence in the environment and their potential adverse effects on organisms. Biofilms that form on microplastics can alter their physical and chemical properties, such as sinking, hydrophobicity, and functional groups. These changes can ultimately modify the adsorption capacity for other pollutants, increasing the uptake and biomagnification of pollutants along the food chain.
Biofilms can also affect nutrient cycling in aquatic environments. For example, they can increase denitrification in artificial freshwaters and reduce the enzymatic activity of important enzymes for carbon and nitrogen cycling. The degradation of plastics has been suggested to be a major source of dissolved organic carbon, which can influence the carbon cycle. Biofilms on microplastics can also release chemical signals that encourage their ingestion by organisms.
Furthermore, biofilms on microplastics can act as vectors of pollutants in aquatic environments, facilitating the spread of potentially pathogenic microorganisms across aquatic communities. While the full extent of the impact of biofilms on microplastics is not yet fully understood, studies have shown that environmental factors such as water pH, temperature, and salinity affect biofilm formation on microplastics.
Biofilms also have beneficial applications in bioremediation, where they can be used to transform hazardous pollutants into harmless substances, protect plants against phytopathogens, promote plant growth, and remove excess nutrients from wastewater.
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Biofilms can be used to treat wastewater
Biofilms have been used to treat wastewater in the past few years due to their ability to remove pollutants. Wastewater contains multiple contaminants, including organic and inorganic pollutants, that can be treated with biofilms. Biofilms are used in bioremediation, an environmentally benign method for decontaminating harmful contaminants for environmental sustainability and safety. Bioremediation has been used to eliminate, mineralize, degrade, and neutralize many inorganic and organic contaminants from wastewater using microbial communities (bacteria, fungi, and algae).
Biofilm-based environmental bioremediation is more eco-friendly and cost-effective than other chemicals, physical, and thermal approaches. Biofilms can help eliminate petroleum oil from contaminated oceans or marine systems. The oil is eliminated by the hydrocarbon-degrading activities of communities of hydrocarbonoclastic bacteria (HCB). In addition, biofilms can be used to remove excess nutrients from wastewater, such as organic and nitrogenous substances, and are connected with biological oxygen demand (BOD), ammonia, nitrogen, nitrate, and dissolved O2.
Biofilms are also used in microbial fuel cells (MFCs) to generate electricity from a variety of starting materials, including complex organic waste. Biofilms are relevant for the improvement of metal dissolution in the bioleaching industry and the aggregation of microplastics pollutants for convenient removal. In activated sludges of wastewater treatment plants (WWTPs), AHLs-producing QS and AHLs-degrading QQ (quorum quenching) bacteria contribute significantly to controlling the development of biofilm in biological wastewater treatments.
Biofilms can form on virtually every non-shedding surface in non-sterile aqueous or humid environments. They can be found on the surface of and inside plants, and either contribute to crop disease or exist symbiotically with the plant. Biofilms can also be found on rocks and pebbles at the bottoms of most streams or rivers and often form on the surfaces of stagnant pools of water.
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Frequently asked questions
Biofilms are an aggregation of microbial organisms enclosed in an extracellular polymeric matrix (extracellular DNA, carbohydrates, proteins, and water), self-synthesized by bacteria and irreversibly attached to an inert surface.
Biofilms can bind to pollutants through biological absorption, immobilization, and breakdown.
Microplastics in the environment can be easily colonized by microorganisms, forming biofilms. These biofilm-developed microplastics can then act as vectors to introduce pollutants and attached microorganisms into aquatic environments and organisms.
Biofilms can help eliminate pollutants from contaminated oceans, marine systems, soil, and groundwater. For example, biofilms can be used to eliminate petroleum oil from the ocean or to treat groundwater contaminated with heavy metals.
Biofilms can have negative impacts on human health, agriculture, the food industry, drinking water, and oceans. For example, biofilms can cause persistent infections in hospital settings by persisting on medical device surfaces and patient tissues.
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