Mycoremediation is a type of bioremediation that involves the use of fungi for the cleanup of contaminated soils and waters, including groundwater. Fungi are well-known for their ability to colonize a wide range of heterogeneous settings and adapt to complicated soil matrices, even in the face of harsh environmental circumstances. Fungi such as Pleurotus, Aspergillus, Basidiomycetes and Trichoderma have proved to be successful in removing lead, cadmium, nickel, chromium, mercury, arsenic, copper, boron, iron, and zinc in in coastal habitats, wastewater, and on land. Fungi have been shown to be a cost-effective, ecologically friendly method of eliminating a wide range of toxins from contaminated sites. This article will explain to you about Mycoremediation which will be helpful in preparing the Environment syllabus for the UPSC Civil Service exam.

What exactly is Mycoremediation?

• Mycoremediation is a bioremediation technology that uses fungi to remove hazardous substances from the environment.
• It can be done with both filamentous fungi (molds) and macrofungi (mushrooms).
• Both classes have enzymes that can degrade a wide range of contaminants.
• They can also break down organic substances and colonize both biotic and abiotic surfaces with ease.
• Filamentous fungi have several unique properties that make them preferable to yeasts and bacteria for soil bioremediation.
• Byproducts of the remediation process, such as enzymes, edible or medicinal mushrooms, can be valuable resources in and of themselves, making the remediation process even more profitable.
• As a result, mycoremediation is a biological instrument for degrading, transforming, or immobilizing environmental pollutants.

Mycoremediation Using Fungi

Mycoremediation - Influencing Parameters

Chemical And Physical Characteristics of Soil

• In general, soil's chemical-physical properties have a great impact on the mycoremediation process.
• They include pH, temperature, water content, and redox potential which in particular have a substantial impact on microbial development and, as a result, on the success of the procedure itself.

Nutrient Availability

• The biodegradation activity of microorganisms is influenced by the availability of macro-and micronutrients in soil, as well as any other factors that influence microbial metabolism, such as contaminant type and concentration, as well as bioavailability, toxicity, and mobility.
• Although soil normally contains sufficient nutrients for microbial development, nutrients can also be given in a functional form that acts as an electron donor to speed up the bioremediation process.

Genetic Characteristics of the Microorganism

• The biodegradation of a harmful substance is mostly determined by the microorganism's genetic traits, particularly the extracellular and intracellular enzymatic systems.

Contaminant Concentration

• The concentration of contaminants has a direct impact on microbial activity.
• A high concentration could have a range of harmful effects on different microbial species, but a low concentration could not be enough to trigger the production of degradative enzymes.
• Filamentous fungi, for example, are more resistant to high contaminant concentrations than bacteria because they may construct an extended mycelial network and synthesize a large number of atypical enzymes.

Contaminant Bioavailability

• One of the most critical aspects that may be improved to optimize and expedite biodegradation is contaminant bioavailability.
• This fact has been established in the mycoremediation of old PAH-contaminated soil.
• The ability of fungal biosurfactant synthesis to chemically change or impact pollutant bioavailability has been reported in various evaluations.

Mycoremediation- Process

• Because mushrooms and other fungus have enzymatic machinery for degrading waste/contaminants, they can be used to treat a wide range of pollutants.
• Fungi are well-suited to this task because breakdown is their principal function in the environment.
• Fungi are natural decomposers, converting organic matter into soil.
• Extracellular enzymes and acids are secreted by the mycelium of fungus, which break down the two primary building components of plant fiber, lignin and cellulose.
• Since these two chemical molecules are structurally similar to many organic contaminants, mycelium can degrade them as well.
• As various fungal strains are more successful at breaking down certain pollutants, the key to mycoremediation is matching the proper fungal species with the pollutant.
• Wood-degrading fungi, such as oyster mushrooms, are particularly adept at degrading contaminants such as hydrocarbons and pesticides.
• Fungi have the ability to break down big hydrocarbon chains into smaller fragments, allowing microbes and plants to operate on them as well.

Mycoremediation- Mushroom As An Emerging Tool

• Mushrooms have been consumed as a product for a long time because of their flavor and protein content.
• Because of their usage in the remediation of many kinds of contaminants, mushrooms are also known as mycoremediation tools. For the decomposition of many types of substrate and contaminants, mycoremediation relies on the effective enzymes produced by mushrooms.
• In addition to waste degradation, mushrooms are also used as a consumable product.
• However, they may absorb the pollutant in their mycelium (biosorption process) and are unable to ingest it because of the toxic elements received.

Mycoremediation- Advantages

• Low-cost Technology: This is indeed a direct benefit of Mycoremediation. It is a low-cost technology compared to other bioremediation techniques because it does not necessitate the construction of new buildings, structures, residences, or other items and resources.
• Easy Availability: It is a low-cost approach since fungal spores are generally inexpensive and easy to obtain.
• Shorter Span of Treatment: In a short period of time, fungi will spread throughout the soil, reproducing on their own.
• No Additional Costs: To begin the process of mycoremediation, no additional costs are required. Only a minimal amount of fungus or fungal spores can be used to clean up the entire polluted surface.
• Safe Usage: Because this procedure does not require the process of digging and disposal, it is safer than other remediation techniques.
• No- requirement of Further Clean Up: Furthermore, because this process does not generate secondary waste streams, there is no further cleanup required. It is a simple and safer way than other technologies because no machinery is required. Also because results are not toxic, neither humans nor animals are affected.
• Reusable Products: The materials obtained after using the mycoremediation approach are safe and can be utilized for further processing such as land scaling, road underlayment, and so on.
• Safer For Humans And Animals: Because this technology changes dangerous molecules into non-toxic ones, these items are safe for humans and animals to reuse.
• Quick Results: This methodology produces faster results than previous methods. Focusing on odor improvement and reduction at the performance site yields observable effects. This method takes weeks to complete.
• No Noise Pollution: This technique is quieter than other options because it does not require any machinery, construction, or other noise.
• Environment Friendly Approach: This method is natural and does not introduce corrosives or other chemicals into the environment.
• The fungal system works to treat harmful compounds caused by any contaminant, finally restoring the system's original purpose and equilibrium and bringing pollutants back into line with the ecology.

Mycoremediation- Disadvantages

• Unproven Technology: Organizations who want to use these services are finding it difficult to sell them because the technology is yet unproven, and individuals prefer to use established technologies.
• Efficiency: Bio systems are not 100 percent capable, which makes it difficult for users to evaluate and choose the best approach for their needs.
• Toxin Level: If the level of toxins are too high for the fungi to clean they may be at the risk of destruction.

Conclusion

It is undeniable that micro- and macro fungi can decompose organic contaminants and reduce heavy metal concentrations in soil. When compared to other microorganisms, filamentous fungi are more useful in bioremediation processes due to their soil growth morphology, poor specificity of extracellular enzymatic complexes, and the ability to utilize hazardous chemicals as a growth substrate. However, some crucial aspects of the design of a soil mycoremediation process must be considered, such as the selection of the suitable fungal strain and the assessment of its potential interaction with the contaminated soil microbiota.