Algae bloom and Crash in earthern ponds - How Nanobubbles can help

PROBLEM IDENTIFICATION STEPS

Measure and monitor key water  quality parameters (pH, DO, NH3/TAN)

• Digital (Flourescent) (Optical) DO meter
• Measure at 20-30 centimeter above pond bottom
• Measure at Peak DO time (2-3 pm afternoon) and Lowest DO time (4-5 am morning before sunrise)

Learn to recognize different Algae types and suitable levels in pond

• Blue-green algae (cyanobacteria) - harmful
• Green, golden and diatoms

Water clearance measurement

Secchi disk

NAKASHIMA PROPOSAL

For Prevention and Mitigation

• Air Micro-Nanobubbles MNB
• Air Mili-Microbubbles Ven X

For Emergency

• Oxygen Nanobubbles (Pure Oxygen in use)

For Reactive and Periodical Control:

Ozone Nanobubbles or Air Nanobubble + H2O2

• Direct usage in Pond (caution required) – not preferred
• Protein Skimmers

USEFUL FEATURES OF FINE BUBBLES

Nanobubbles (< 1 micrometer) and Microbubbles (10-60 micrometers) with slow rising velocities can remain and be suspended for a period of time long enough to be spread by water flow currents created by the fine-bubbled-water flow and the paddle wheels (the most commonly used in outdoor aquaculture)

Fine-bubbled water is made near the bottom sludge to provide necessary dissolved oxygen to the fish/shrimps and nitrification process supported by microbiome in the bottom sludge

For reduction and control of harmful bacteria and vibrio, Ozone Nanobubbles or Air Nanobubbles plus Hydrogen  Peroxide can be used with caution.

Safer and more controllable sterilization effect by Ozone Nanobubbles or Air Nanobubbles (plus H2O2) can be performed in Protein Skimmers (or so-called Foam Fractionators) where suspended dirts after oxidization  can be expelled at once out of the skimmed water while the ORP (oxidization-reduction potential) of the skimmed water can be measured and monitored (not to exceed 300…350mV)