Someplace between a botanical backyard and a tree stroll on the College of British Columbia, there’s a cedar-clad timber construction with a inexperienced roof, a skylit inside, and a ramp for wheelchair entry. It smells like a forest. It appears to be like like a bit of thought-about structure. And tucked inside its again wall is one thing no public rest room has ever used earlier than: a compartment lined with dwelling mushroom mycelium that absorbs odour, accelerates decomposition, and turns human waste into usable compost and not using a single drop of water, a gram of chemical enter, or a connection to any plumbing system. The MycoToilet, developed by researchers at UBC’s College of Structure and Panorama Structure and the Division of Microbiology and Immunology, launched at UBC Botanical Backyard in September 2025. It’s the first of its sort wherever on this planet, and the issue it’s making an attempt to resolve is significantly bigger than any single campus set up.
The worldwide sanitation disaster that makes mushroom-powered waterless expertise so urgently wanted
The dimensions of the sanitation drawback that applied sciences just like the MycoToilet are designed to handle is genuinely staggering. A 2024 evaluation printed in The ISME Journal by Oxford Educational discovered that over two billion folks wouldn’t have entry to satisfactory sanitation, a determine the UBC Campus as a Dwelling Lab challenge temporary for the MycoToilet places at 2.3 billion, with 450 million folks restricted to open defecation solely. Untreated human waste is a number one explanation for preventable illness and baby mortality throughout the creating world.The dominant options have their very own severe limitations. Centralised sewage remedy is energy-intensive, water-hungry, and requires vital infrastructure funding that many municipalities and rural communities can’t afford. Chemical bogs, the moveable items mostly utilized in parks, building websites, and occasion areas, depend on formaldehyde and different poisonous chemical compounds that require dealing with waste as a hazardous materials on the disposal stage. Typical composting bogs are a cleaner different in precept, however have traditionally suffered from odour issues, inconsistent decomposition, and an operational popularity that has made municipalities reluctant to undertake them at scale.
What’s Mycelium and the way do fungi break down human waste sooner than commonplace composting
The MycoToilet’s core innovation is changing the usual composting course of with one pushed by fungal mycelium, the dense, thread-like root community that types the vegetative physique of a mushroom, distinct from the fruiting physique that seems above floor. In response to a2023 evaluation on mycoremediation printed in Utilized Sciences, fungi produce highly effective extracellular enzymes able to breaking down complicated natural compounds, together with lignocellulosic biomass, hydrocarbons, and organic waste, into less complicated compounds that microbial communities can then course of additional. This enzymatic capability is what makes mycelium notably well-suited to decomposing human waste.“Fungi are excellent at breaking down biomass, together with human and animal waste,” stated Dr Steven Hallam, professor in UBC’s Division of Microbiology and Immunology, within the official UBC announcement. “They produce enzymes that remodel materials into less complicated compounds whereas supporting microbial communities that speed up decomposition. No added water, electrical energy or chemical compounds are required.”The UBC Dwelling Lab challenge abstract notes that mycelium-based decomposition of dangerous pathogens takes roughly half the time of conventional composting bogs a big operational benefit for a system designed to be maintained on a minimal schedule. Laboratory exams of the mycelium liners confirmed they take away greater than 90 per cent of odour-causing compounds, addressing the one largest sensible barrier to composting rest room adoption in public and group settings.
How the MycoToilet system separates waste, eliminates odour, and produces fertiliser and compost
The MycoToilet operates by a separation-first design. Liquid and strong waste are divided on the level of deposit, with strong waste channelled into the mycelium-lined composting compartment on the rear of the construction. The fungi and the thermophilic microbial communities they assist then break down the strong materials aerobically, which means within the presence of oxygen, which prevents the anaerobic situations chargeable for the odours and methane manufacturing that plague poorly designed composting programs.A low-power fan maintains air circulation by the ventilated cedar construction, and the skylit design helps passive temperature regulation. The 4 upkeep visits per 12 months the system requires are intentionally scheduled slightly than reactive, a design selection that challenge lead Affiliate Professor Joseph Dahmen of UBC’s College of Structure and Panorama Structure described as intentional: “We have taken out the uncertainty that may scare municipalities away from composting bogs and solved it the schedule is about, the air flow is built-in, every little thing works because it ought to.”When absolutely operational, the MycoToilet is projected to supply roughly 600 litres of nutrient-rich soil compost and a couple of,000 litres of liquid fertiliser yearly. The nutrient restoration numbers are vital: a research printed in The ISME Journal discovered that well-managed composting of human excrement can get better as much as 91 per cent of the nitrogen, 83 per cent of the phosphorus, and 59 per cent of the potassium current within the waste vitamins that, if returned to agricultural soil, scale back dependency on artificial chemical fertilisers.
The structure and supplies behind the MycoToilet’s design at UBC Botanical Backyard
The bodily construction of the MycoToilet is as deliberate as its organic system. Prefabricated timber panels type the first construction, with a cedar exterior that’s naturally rot-resistant and has been charred a conventional Japanese method known as shou sugi ban to offer it further antimicrobial properties. The inexperienced roof helps native crops and native wildlife habitat. The inside combines timber and chrome steel finishes with odour-absorbing mycelium compartments, designed by Dahmen to interchange the look and odor sometimes related to composting bogs with one thing nearer to a forest shelter.“We needed to show a every day routine everybody is aware of into a nice expertise that reminds us of our connection to ecological cycles,” Dahmen stated. The construction blends into the botanical backyard’s forest setting, is absolutely wheelchair accessible through a ramp, and was constructed to be modular and relocatable a design characteristic with direct implications for deployment in parks, distant communities, and areas with out plumbing infrastructure.
What the six-week pilot take a look at and future analysis will decide about scaling the MycoToilet
The six-week pilot that started on the finish of September 2025 is testing the MycoToilet underneath real-world utilization situations, with researchers from each SALA and the Division of Microbiology and Immunology monitoring how the fungal and microbial communities work together because the system processes precise human waste at quantity.If the pilot demonstrates constant efficiency, the self-contained, chemically clear, and low-maintenance nature of the system positions it as a reputable different to chemical bogs in parks and public areas and probably a significant sanitation possibility for the communities that want it most. A rest room that requires no water, no chemical compounds, no sewage connection, and solely 4 upkeep visits a 12 months, whereas changing its waste into agricultural inputs, is a basically totally different proposition from something at present deployed at scale. Whether or not it will probably attain that scale is what the analysis now has to reply.
