Page 25 - Agricultural innovation

bubbles. The distance from the electrode surface to the diaphragm is very narrow (≈1mm), the time
of electrochemical action on the water particles is short, thus minimizing the exothermic effect. All
the special structural details have facilitated most of the elements in the water flowing through the
electrochemical chamber to be in contact with the electric double layer to absorb the energy from the
charged particles and convert it into internal potential. As a result, the water particles are excited to
a pseudostable excited state with quenching times that can last for tens of hours. After creating air
bubbles from the electrochemical unit, the anolyte aqueous solution is put into the ultrasonic beaker
and treated for 5–10 seconds to create a solution containing microbubbles-nanobubbles. Anolyte has
fast and strong antiseptic properties although it has less active chlorine than javen water (hypochlorite
sodium). Because this solution contains a series of oxidants located in pseudostable states such as
H O , O , HO , HClO, ClO- … when it is put into the ultrasonic device, it will explode the air bubbles
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generated from the electrochemical unit to become microbubbles-nanobubbles that enhance the ability
to kill bacteria many times.
Nanobubble microbubble solution is prepared from an electrochemical-ultrasonic system that has
the ability to quickly kill bacteria, viruses, and molds in a short time of contact but without being
greasy after a long time of use; treat saltwater and brackish water polluted by bacteria, algae and toxins
with high efficiency; simple production process, low cost—only costs about 700 VND/m compared
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to 2,000 VND/m when using chemicals for treatment. Besides, normally, the shrimp farming process
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will release a large amount of dirty wastewater into the environment, but this new water treatment
method will only consume a small amount of electricity, not water.
Microbubble solution prepared from electrochemical-ultrasonic has many preeminent features
such as: capable of treating Vibrio spp. high efficiency; non-toxic, does not affect the user’s health,
is environmentally friendly; low cost, simple production process suitable for brackish and saltwater
aquaculture areas.

Figure 7. System for treatment of water by electrochemincal-ultrasonic method
Source: Vietnam Agriculture Newspaper

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