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Mycoremediation (from ancient Greek μύκης (), meaning "fungus", and the suffix -remedium, in Latin meaning 'restoring balance') is a form of bioremediation in which fungi-based remediation methods are used to decontaminate the environment. Fungi have been proven to be a cheap, effective and environmentally sound way for removing a wide array of contaminants from damaged environments or wastewater. These contaminants include heavy metals, organic pollutants, textile dyes, leather tanning chemicals and wastewater, petroleum fuels, polycyclic aromatic hydrocarbons, pharmaceuticals and personal care products, pesticides and herbicides in land, fresh water, and marine environments.
The byproducts of the remediation can be valuable materials themselves, such as enzymes (like laccase), edible or medicinal mushrooms, making the remediation process even more profitable. Some fungi are useful in the biodegradation of contaminants in extremely cold or radioactive environments where traditional remediation methods prove too costly or are unusable.
Mycoremediation is a cheaper method of remediation, and it doesn't usually require expensive equipment. For this reason, it is often used in small scale applications, such as mycofiltration of domestic wastewater, and industrial effluent filtration.
According to a 2015 study, mycoremediation can even help with the polycyclic aromatic hydrocarbons (PAH) soil biodegradation. Soils soaked with creosote contain high concentrations of PAH and in order to stop the spread, mycoremediation has proven to be the most successful strategy.
Not all the individuals of a species are effective in the same way in the accumulation of toxins. The single individuals are usually selected from an older polluted environment, such as sludge or wastewater, where they had time to adapt to the circumstances, and the selection is carried on in the laboratory. A dilution of the water can drastically improve the ability of biosorption of the fungi.
The capacity of certain fungi to extract metals from the ground also can be useful for bioindicator purposes, and can be a problem when the mushroom is of an edible variety. For example, the shaggy ink cap ( Coprinus comatus), a common edible mushroom found in the Northern Hemisphere, can be a very good bioindicator of mercury. However, as the shaggy ink cap accumulates mercury in its body, it can be toxic to the consumer.
The capacity of metals uptake of mushroom has also been used to recover precious metals from medium. For example, VTT Technical Research Centre of Finland reported an 80% recovery of gold from electronic waste using mycofiltration techniques.
Other toxins fungi are able to degrade into harmless compounds include petroleum fuels, phenols in wastewater, polychlorinated biphenyl (PCB) in contaminated soils using Pleurotus ostreatus, polyurethane in aerobic and anaerobic conditions, such as conditions at the bottom of landfills using two species of the Ecuadorian fungus Pestalotiopsis, and more.
The mechanisms of degradation are not always clear, as the mushroom may be a precursor to subsequent microbial activity rather than individually effective in the removal of pollutants.
The mechanism by which the fungi degrade dyes is via their lignolytic enzymes, especially laccase, therefore white rot mushrooms are the most commonly used.
Mycoremediation has proven to be a cheap and effective remediation technology for dyes such as malachite green, nigrosin and basic fuchsin with Aspergillus niger and Phanerochaete chrysosporium and Congo red, a carcinogenic dye recalcitrant to biodegradative processes, direct blue 14 (using Pleurotus).
Microorganisms play an important role in the field of environmental science by degrading and transforming PCP into non-toxic or less toxic forms. Naturally how completely and efficiently PCP degradation occurs depends by microorganisms and the environmental conditions.There are numerous studies that focus research efforts on degradation of PCP by pure and mixed cultures of aerobic and anaerobic microorganisms. Conditions that inhibit and enhance degradation, and pathways, intermediates and enzyme systems implicated essentially in PCP degradation especially by bacteria such as Pseudomonas spp., Flavobacterium spp., Nocardioides spp., Novosphingobium spp., Desulfitobacterium spp., Mycobacterium spp., Sphingomonas sp., Kokuria spp., Bacillus spp., Serratia sp. and Acinetobacter spp. and fungi such as Phanerochaete spp., Anthracophyllum spp., Trametes spp., Mucor spp., Byssochlamys spp. and Scopulariopsis spp.
Most land plants can form a symbiotic relationship with fungi which is advantageous for both organisms. This relationship is called mycorrhiza. Researchers found that phytoremediation is enhanced by mycorrhizae. Mycorrhizal fungi's symbiotic relationships with plant roots help with the uptake of nutrients and the plant's ability to resist biotic and abiotic stress factors such as heavy metals bioavailable in the rhizosphere. Arbuscular mycorrhizal fungi (AMF) produce proteins that bind heavy metals and thereby decrease their bioavailability. The removal of soil contaminants by mycorrhizal fungi is called mycorrhizoremediation.
Mycorrhizal fungi, especially AMF, can greatly improve the phytoremediation capacity of some plants. This is mostly due to the stress the plants suffer because of the pollutants is greatly reduced in the presence of AMF, so they can grow more and produce more biomass. The fungi also provide more nutrition, especially phosphorus, and promote the overall health of the plants. The mycelium's quick expansion can also greatly extend the rhizosphere influence zone (hyphosphere), providing the plant with access to more nutrients and contaminants. Increasing the rhizosphere overall health also means a rise in the bacteria population, which can also contribute to the bioremediation process.
This relationship has been proven useful with many pollutants, such as Rhizophagus intraradices and Robinia pseudoacacia in lead contaminated soil, Rhizophagus intraradices with Glomus versiforme inoculated into vetiver grass for lead removal, AMF and Calendula officinalis in cadmium and lead contaminated soil, and in general was effective in increasing the plant bioremediation capacity for metals, petroleum fuels, and PAHs. In wetlands AMF greatly promote the biodegradation of organic pollutants like benzene-, methyl tert-butyl ether- and ammonia from groundwater when inoculated into Phragmites australis.
Some fungi species, like Rhodotorula taiwanensis, are resistant to the extremely low pH (acidic) and radioactive medium found in radioactive waste and can successfully grow in these conditions, unlike most other organisms. They can also thrive in the presence of high concentrations of mercury and chromium. Fungi such as Rhodotorula taiwanensis can possibly be used in the bioremediation of radioactive waste due to their low pH and radiation resistant properties. Certain species of fungi are able to absorb and retain such as 137Cs, Strontium, 152Eu, 239Pu and 241Am. In fact, cell walls of some species of dead fungi can be used as a filter that can adsorb heavy metals and radionuclides present in industrial effluents, preventing them from being released into the environment.
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