UFB Industrial ApplicationsWhich Gas for Which Process
UFB industrial applications depend on two things: the physical mechanism doing the work, and the gas chosen to deliver it. “UFB” is the ISO 20480-1 standard term for ultra-fine bubble technology. The mechanisms — extended gas-water contact time, reduced surface tension, and a stable surface charge — are gas-agnostic; they apply however the bubble is generated, and are explained in full in What Is Ultra-Fine Bubble (UFB) Technology? The gas is a separate choice, made based on the chemistry the process needs: oxygen for aeration, ozone for oxidation, nitrogen for an inert atmosphere.
The table below summarises the gases most commonly used in UFB systems and where each is applied. The sections that follow go through the industrial applications in more detail, noting which mechanism is doing the work in each case.
| Gas | Characteristics of the gas | Why UFBs are useful | Main applications |
|---|---|---|---|
| Oxygen (O₂) | Essential for aerobic biological processes. Low solubility in water; escapes quickly as conventional bubbles. | Keeping it at nano scale increases gas-water contact area and keeps oxygen dispersed for longer, improving availability. | Aquaculture, wastewater treatment, hydroponics, irrigation, lake restoration |
| Air | Approx. 78% nitrogen, 21% oxygen. Abundant, inexpensive, the most common gas source for aeration. | At this scale, the oxygen naturally in air transfers more efficiently — a low-cost method for increasing dissolved oxygen. | Laundry, industrial cleaning, ponds, wastewater aeration, cooling systems |
| Ozone (O₃) | Powerful oxidizing, disinfecting gas. Unstable; decomposes rapidly back into oxygen. | Breaking it down to nanobubble size improves dissolution and increases the time it remains active before breaking down. | Drinking water treatment, food washing, wastewater treatment, industrial sanitation |
| Carbon Dioxide (CO₂) | Highly soluble. Important in photosynthesis; forms carbonic acid, lowering pH. | At nano scale, dissolved CO₂ levels are easier to maintain and distribute efficiently. | Greenhouses, algae cultivation, beverage processing |
| Nitrogen (N₂) | Inert, very low chemical reactivity. Used where oxygen removal or an oxygen-free environment is required. | This size allows efficient dispersion into liquids and helps reduce dissolved oxygen levels. | Food preservation, chemical processing, specialty manufacturing |
| Hydrogen (H₂) | The lightest gas, very low solubility in water. Diffuses quickly; easily lost from solution. | Generated as nanobubbles, hydrogen escapes more slowly, helping maintain dissolved hydrogen for longer. | Hydrogen-rich water production |
Oxygen: extended contact time for aeration
The mechanism here is extended gas-water contact time: oxygen nanobubbles stay suspended long enough to dissolve fully, raising dissolved oxygen beyond what surface aeration achieves. This is the basis for two of the more established industrial applications of the technology.
In wastewater treatment, higher dissolved oxygen improves the biological treatment stages that depend on it, and installations are documented at both municipal and industrial facilities. See Nanobubbles in Wastewater Treatment: A Review of the Evidence for the full evidence review.
In aquaculture, the same mechanism supports higher stocking densities without the oxygen crashes that cause die-offs. Commercial operations in Brazil and across Latin America already run this at production scale, covered in Portuguese and Spanish e-book editions; an English edition is in development.
Air: surface tension for cleaning
Air is the lowest-cost gas source for UFB systems. Some air-based applications use the same extended-contact-time mechanism as oxygen above — general aeration in cooling systems and wastewater lines, at lower cost. Industrial cleaning uses a different mechanism entirely: reduced surface tension.
Pre-paint vehicle-body washing, tank and vessel cleaning between production batches, and machinery degreasing all depend on water penetrating oil, grease, and residue more completely, so less surfactant is needed to lift it. Commercial car-wash pre-soak systems were among the first documented commercial installations of this effect.
Surface charge: biofilm and scale control
Not every industrial application is defined by gas choice. Biofilm and mineral scale control inside pipes, membranes, and cooling systems depends on the third mechanism — surface charge — and works with whichever gas the system already runs on, typically air. Nanobubble water clears existing biofilm more effectively than plain water, and the same negative surface charge makes it physically harder for new biofilm and scale to form in the first place.
This is installed at building level in facilities where Legionella control matters — nursing homes and dialysis units — and in industrial cooling towers, drip irrigation, and filtration systems, where scale and biofilm buildup otherwise force frequent, production-stopping cleaning cycles.
Ozone: extended contact time for disinfection
Ozone is a strong oxidiser and disinfectant, but it is unstable and normally decomposes back into oxygen within minutes. The extended-contact-time mechanism applies here too: reducing ozone to nanobubble scale improves how much dissolves and extends how long it stays active before breaking down, which is what makes it usable as a disinfection method rather than a brief burst of oxidation.
In food processing, this is used to clean processing lines and wash produce without relying on hot water or heavy detergent loads, reducing surface microbial load and extending shelf life. Equipment selection depends on facility certification and which gas the process is approved for — see Nanobubbles Food Safety & Processing for device selection specific to this application.
The same oxidative effect is used in wastewater treatment and general industrial sanitation, typically alongside — not instead of — the oxygen-based aeration covered above.
Nitrogen and carbon dioxide: displacement and dissolution
Nitrogen and carbon dioxide rely on the same extended-contact-time mechanism as oxygen and ozone — keeping the gas dissolved and available for longer — applied to a different chemical goal. Nitrogen is inert and used to displace oxygen where an oxygen-free environment is required, such as food preservation and specialty chemical processing. Carbon dioxide is highly soluble and used where dissolved CO₂ levels need to be maintained and distributed efficiently, including greenhouse irrigation, algae cultivation, and beverage processing.
Published field data for these two is more limited than for the oxygen- and ozone-based applications above. The mechanism is documented; production-scale deployment is earlier-stage.
Choosing Equipment for UFB Industrial Applications
Not every claim made for industrial UFB equipment is equally supported. Detergent-free laundry claims, universal water-quality benefits, and therapeutic drinking-water effects are common marketing claims without peer-reviewed backing. The applications above are the ones with documented evidence behind them, and matching mechanism and gas to the process — not brand — is what determines whether a system suits a given job.
Nanobubbles: What’s Real, What’s Hype covers this in more detail, including a device-selection framework for evaluating equipment from any manufacturer.
For the full set of industrial application guides — including notify-me signup for editions still in development — see the Applications page.