Application of ‘Nano-Bubbles' to Water Treatment for Aquaculture

A new technology from Japan is demonstrating exciting improvements in water quality.

The concept is very simple; much smaller bubbles in the aerator.  Only 100nm across, these ‘nano-bubbles’ are so small that they have insignificant buoyancy and remain suspended in the liquid indefinitely, resulting in high levels of aeration and massive surface area.  Oxygenation activity is high reducing BOD, COD, H₂S, CH₄ and ammonia, and suspended solids (even oil dispersions) are rapidly lifted out of suspension to be skimmed off.

The presentation will briefly introduce the technology and then share the data from Asian case studies showing improved fish health and weight gain, as well as reduced discharge pollution, reduced use of chemicals and reduced odor.

A 54% greater weight gain over a control system was demonstrated for commercial tilapia over 39 days. Lower death rates and higher vigor / eating voracity were both experienced.  It also seems that the small size of the nano-bubbles allows them to cross the water / blood boundary, and the blood / muscle boundary and have a direct effect on the fish physiology.