What nanobubbles do for your water

The eight applications above are three properties of a gas cavity under 200 nanometres, pointed at different water.

It stays. Buoyant force scales with volume, drag roughly with radius, so under 200 nm buoyancy loses. The cavity travels with the water for days to weeks instead of rising out of it.

It presents an enormous interface. Billions of cavities give a gas–liquid area no diffuser reaches at any pressure, so transfer runs towards completion instead of racing the ascent.

It carries charge. A negative zeta potential stops the cloud coalescing, and lets a bubble attach to a solid, an oil film or a biofilm and lift it.

Oxygenation and gas infusion come out of the first two, cleaning and flotation out of the third. Nothing is dosed in any of them. The physics is in our approach to nanobubble technology.

Ozone works on contact, and contact is what a coarse-bubble contactor struggles to buy: much of the dose reaches the surface undissolved and is destroyed in the off-gas.

Inside a cavity under 200 nm the ozone goes wherever the water goes — the far corner of a tank, a dead leg, the surfaces where organisms establish. It decays to oxygen, so nothing is left to remove and no dosing equipment appears on site.

That is intake duty in aquaculture, and the same case in food processing water treatment. Placement, and the comparison with UV, are covered under treating water at the intake.

Biofilm is not dirt sitting on a surface. It is a community anchored in a matrix it secretes itself, and it grows back from whatever survives the clean. Chemicals attack the matrix; nanobubbles attack the attachment.

Small enough to enter the boundary layer at the wall, the cavities carry negative charge into it, destabilise the bond to the substrate and lift material into the water to be filtered or floated off. Run continuously the effect is preventative, and cleaning cycles and downtime fall with it.

The same charge degreases

Bubbles wedge under an oil film, weaken its adhesion and carry it up: equipment degreased with no detergent in the loop, and the reason the mechanism belongs in desalination pretreatment. In open water the target is algae rather than film, and the lever is oxygen at depth.

Flotation is a collision problem. A particle has to meet a bubble, drain the film between them and hold on to the froth. Fines fail: they lack the inertia to cross the streamlines around a rising bubble, so recovery falls away where a finer grind puts the value.

Nanobubbles change the attachment step rather than the cell. They nucleate on hydrophobic surfaces, so a conditioned particle arrives already carrying gas. In water treatment the same behaviour reads as clarification — charged cavities attach to fine solids and oil droplets and float them out. Hence NanoMAR's 80 %+ suspended-matter removal and 50 %+ turbidity reduction.

Two sectors live here: minerals, where the argument is froth flotation and tailings water, and produced water treatment. Both gain twice — less liquid to dewater, less mass downstream.

Root zones are oxygen-limited more often than water-limited. A saturated substrate has no air-filled porosity left, so roots and the microbes around them compete for the oxygen the water carries. Oxygen delivered as nanobubbles survives the run from header to emitter, and the same flux discourages the biofilm that blocks drippers.

Odour is an anaerobic symptom. Hydrogen sulphide appears where a sludge blanket has run out of oxygen; holding dissolved oxygen up keeps digestion aerobic and removes the conditions rather than masking the smell. Flotation does the rest: denser sludge means fewer transports and a lower cost per cubic metre of dewatered mass.