New bubble based antifouling solution being trialled at Nelson Marina

Cawthron Institute is trialling an innovative new antifouling technology at Nelson Marina. Effective antifouling products are essential to keep our boats clean, but existing biocidal products are increasingly being banned due to their environmental risks so it is important that new, ecofriendly products are developed and become available for us all to use.

The new approach, is part of the Marine Biosecurity Toolbox project and relies on microscopic, trapped air layers rather than harmful biocidal chemicals. The approach mimics the air-trapping ability of the feathers of waterfowl and seabirds by using textiles that have been treated to make them ‘super hydrophobic’ (water hating). 

When the material is submerged in the sea, it traps and retains a microscopic layer of air that effectively ‘cloaks’ the surface and prevents fouling from touching or adhering to it. The air layers require periodic replenishment, which is currently achieved via diffuser arrays that pulse bubbles onto the surface at required timeframes.

The field test compares several variations of the new technology with different bubbling regimes. The results will inform further optimisation of the product, including improved methods for air-layer replenishment and methods of application. 

Ultimately, the antifouling technology could see use for vessels, aquaculture structures, and even marina pontoons. 

The experiment currently underway in the marina is a notable step in the development of this innovative approach to antifouling, and will hopefully result in a new, ecofriendly option to manage the significant problems posed by biofouling.

Images and story provided by Nelson Marina