Edited by: Somya Mehta | Graphic by: Ethan Kung
How Mycoremediation Uses Mushrooms to Clean Polluted Environments
A mushroom is only the visible part of a much larger organism. Beneath it, threadlike cells called hyphae weave together into mycelium, a network that moves through soil, wood, and other material in search of nutrients. Researchers are learning to put that hidden network to work against pollution. This approach, called mycoremediation, uses fungi or fungal products to remove, trap, or break down contaminants in soil and water.
Fungi are useful because they digest food outside their bodies. They release enzymes into their surroundings, chop large molecules into smaller pieces, and then absorb what they can use. White-rot fungi are especially interesting. In nature, they decompose lignin, the tough polymer that helps support wood. Their enzymes, including laccase, lignin peroxidase, and manganese peroxidase, are not highly selective. That flexibility allows the same chemical toolkit to act on compounds that resemble lignin, including some petroleum hydrocarbons, pesticides, industrial dyes, and polychlorinated biphenyls.
The process is more complicated than scattering mushrooms over a spill. Cleanup teams may mix fungal material into contaminated soil, grow fungi on straw or wood chips, or pass polluted water through a fungal treatment system. The branching mycelium spreads through small spaces and brings its enzymes into contact with contaminants. As fungi alter an organic pollutant, other microorganisms may continue the job. Ideally, the original chemical is converted into less harmful products, but researchers must test both what disappeared and what replaced it.
Laboratory and small-scale studies show why the idea is appealing. In one experiment, researchers mixed spent oyster mushroom compost into petroleum-contaminated soil. After three months, soil treated with 10% compost plus fertilizer had 64.7% less total petroleum hydrocarbons than the control. The compost was not just waste from mushroom farming; it carried fungal mycelium, enzymes, and a community of hydrocarbon-degrading microorganisms. This suggests that one waste product could help treat another.
Heavy metals require a different strategy. An element such as lead or cadmium cannot be chemically broken into a harmless substance by an organism. Instead, fungal cell walls can bind metal ions through biosorption, while living cells may accumulate metals. That can concentrate contamination into fungal material that must then be collected, handled, and disposed of safely. In other words, fungi may move or immobilize metals, but they do not make the metals vanish.
Mycoremediation also has practical limits. A fungus that attacks one chemical may do little to another, and a strain that succeeds in a controlled container may struggle at a real site. Temperature, pH, oxygen, moisture, nutrients, native microbes, and the contaminant’s concentration can all change the outcome. Large sites also raise engineering questions: how should enough fungal material be produced, distributed, protected, and later removed? A review of petroleum mycoremediation concludes that researchers still need application methods that translate laboratory results into field use.
For now, fungi are better viewed as specialized partners than as a universal cure. They may work alongside bacteria, plants, composting, or physical cleanup, with the combination matched to each polluted site. Continued field trials could identify sturdier strains, better growing materials, and reliable ways to monitor breakdown products. Mushrooms will not solve every contamination problem, but their underground networks offer a compelling lesson: an organism known for recycling a fallen log may also help repair some of the industrial damage above it.