Mycofiltration is an approach to water treatment that uses fungi, usually through their thread-like growth known as mycelium, to help capture, transform, or reduce pollutants. In industrial wastewater management, it is best understood as a potential treatment component rather than a universal replacement for established physical, chemical, and biological processes.
Interest in mycofiltration comes from the ability of some fungi to grow through porous materials and interact with a wide range of compounds. However, performance depends strongly on the wastewater, the fungal system selected, and how the treatment is designed and operated. A responsible assessment therefore begins with the treatment objective and the characteristics of the wastewater, not with the assumption that fungi will remove every contaminant.
What is mycofiltration?
Mycofiltration refers to the use of fungal biomass or fungal-containing media to help treat contaminated water. The fungi may be grown on a supporting material, incorporated into a filter bed, or used in another controlled treatment unit. As water passes through or contacts the system, several processes may occur:
- Physical capture: the structure of the fungal growth and its supporting media can help retain suspended particles or associated contaminants.
- Adsorption: some dissolved substances may attach to the surfaces of fungal cells or the surrounding material. Adsorption means attachment to a surface; it does not necessarily mean that the pollutant has been destroyed.
- Biological transformation: certain fungi produce enzymes that can break down or alter particular organic compounds.
- Changes in water chemistry: fungal activity may influence conditions such as acidity or the availability of nutrients, which can affect other treatment processes.
These mechanisms can operate together, but they are not equally effective for every pollutant. A system that captures a contaminant may concentrate it in the fungal biomass or filter media, creating a requirement for testing, monitoring, and responsible disposal or further treatment.
Where might mycofiltration fit?
Industrial wastewater is rarely a single, consistent stream. It may contain suspended solids, biodegradable organic matter, nutrients, metals, salts, solvents, colour, process chemicals, or mixtures of these. The most suitable role for mycofiltration will depend on which contaminants are present and what the facility must achieve.
Potential roles include:
- Polishing after primary or biological treatment: a fungal stage may be investigated to help address residual organic compounds, colour, or other defined treatment targets.
- Pre-treatment for a downstream process: reducing a particular load before another treatment stage may improve the overall process, provided the fungal unit does not create new problems for downstream equipment or biology.
- Decentralised or lower-throughput treatment: some sites may consider fungal systems where wastewater volumes are limited or where a modular treatment step is practical.
- Controlled treatment of a specific side stream: a relatively consistent wastewater stream may be easier to test and manage than a mixed discharge with changing chemistry.
In many cases, mycofiltration would be one part of a treatment train. Screening, equalisation, settling, conventional biological treatment, chemical treatment, membrane processes, or other controls may still be needed. A fungal stage should be evaluated according to the contribution it can reliably make to the complete system.
What determines feasibility?
Wastewater characteristics
Before selecting a fungal approach, an organisation needs a clear picture of the wastewater. Sampling should consider flow, variability, temperature, acidity or alkalinity, suspended solids, organic loading, salinity, nutrients, and the specific contaminants of concern. Occasional sampling may not capture changes caused by production schedules, cleaning, batch operations, or accidental releases.
Some wastewater conditions may inhibit fungal growth or reduce treatment performance. High concentrations of toxic compounds, extreme chemical conditions, insufficient nutrients, or rapidly changing flows can all create design challenges. The fact that a fungus can interact with a contaminant in principle does not establish that it will do so effectively in a full-scale industrial system.
System design and operation
A mycofiltration unit needs suitable contact between the wastewater and the active treatment media. Design decisions may include the type of support material, the available surface area, hydraulic loading, retention time, aeration, moisture, temperature control, and protection from clogging. These are engineering questions that must be matched to the site and wastewater rather than copied from an unrelated application.
Fungal growth also needs management. Biomass can become excessive, uneven, inactive, or detached from the support material. Solids may accumulate and reduce flow. The treatment media may eventually require replacement or regeneration. Routine inspection and maintenance should therefore be included in any cost and practicality assessment.
Contaminant fate
Measuring a lower concentration in treated water is not enough on its own. The assessment should determine whether a contaminant has been degraded, transferred to biomass, retained in filter media, or changed into another compound. Where transformation occurs, the resulting substances also need consideration.
Fungal biomass and used media must be handled according to their contaminant content and applicable waste requirements. They should not automatically be treated as harmless organic material or applied to land without appropriate assessment and approval.
Testing before wider implementation
Controlled testing is essential because mycofiltration performance is application-specific. A sensible development pathway may include:
- Define the treatment objective. Identify the contaminant or water-quality parameter that needs improvement, the required discharge or reuse standard, and the role the fungal stage would play.
- Characterise the wastewater. Establish representative chemistry, flow patterns, variability, and any substances that could inhibit biological activity.
- Conduct laboratory or bench-scale screening. Compare candidate fungal systems and media under conditions that reflect the intended wastewater. Results should include untreated controls and measurements of both water quality and contaminant fate.
- Test operating stability. Assess loading changes, maintenance requirements, clogging, biomass management, start-up time, and performance over an appropriate period.
- Evaluate a pilot system. If early testing is promising, a pilot can reveal practical issues that are not visible at small scale, including hydraulic behaviour, integration with existing equipment, and operator requirements.
- Review compliance and risk. Confirm permitting, discharge obligations, worker protection, biological controls, waste handling, and environmental safeguards with qualified professionals and relevant authorities.
Performance should be judged using agreed criteria such as contaminant reduction, consistency, energy and chemical requirements, maintenance frequency, residual waste, whole-life cost, and compatibility with existing treatment. A low-cost medium or simple-looking filter is not necessarily a low-cost treatment system once monitoring, replacement, safety controls, and waste management are included.
Safety and environmental responsibility
Industrial wastewater may contain substances hazardous to people and ecosystems. Fungal treatment does not remove the need for containment, appropriate personal protective equipment, safe sampling, process controls, and emergency planning. The introduction or release of fungal material should also be considered carefully, particularly where non-native organisms, contaminated biomass, or uncontrolled growth could present environmental concerns.
System operators should have clear procedures for inspection, cleaning, media replacement, spill response, and the handling of spent biomass. Any proposed use of treated solids or residual materials should be supported by appropriate testing and regulatory review.
A practical way forward
Mycofiltration may be worth investigating when a facility has a clearly defined treatment problem, a reasonably consistent wastewater stream, and the ability to monitor and manage a biological process. It may offer a useful supplementary step in a broader remediation strategy, but it should not be selected on the basis of general claims about fungi alone.
The next step is to characterise the wastewater and identify a realistic treatment objective. The organisation can then consult qualified wastewater, environmental, and process specialists to assess candidate designs, regulatory requirements, and risks. Controlled testing followed by a carefully monitored pilot provides a more reliable basis for decisions than adopting a full-scale system immediately. This measured approach helps determine whether mycofiltration can deliver a meaningful, safe, and economically responsible contribution to the site’s wastewater-management system.