Environment – Breaking down persistent substances through the power of electricity

Gas/Liquid interfacial discharge technology

Gas/Liquid interfacial discharge technology achieves cost reduction and energy savings

Problems with industrial wastewater

  • Often contains substances that do not decompose easily such as surfactants (detergents), pesticides, pharmaceutical drugs, and dioxins.
  • The cost of fully breaking down such substances is extremely high. If removed through adhesion to activated carbon, the activated carbon itself then becomes waste.

Gas/Liquid interfacial discharge technology generates OH radicals by applying an electrical discharge to the surface of water in contact with oxygen gas. OH radicals have a strong oxidizing ability that enables persistent substances to be broken down into CO2 or water (H2O) (oxidation reaction) when making contact.

The OH radicals that do not react at the interface combine to form hydrogen peroxide (H2O2), which dissolves in water. The water contains ozone created through electrical discharge. Additionally, OH radicals are generated through the reaction between ozone and hydrogen peroxide, thus enabling the decomposition of persistent substances in water.

Compared to the conventional decomposition method combining ultraviolet rays and ozone, this method is extremely advantageous: it halves the energy required, utilizes only one-tenth of the oxygen previously required, and is inexpensive to implement. Furthermore, less waste is produced than the method of adhering persistent substances to activated carbon, etc. If gas/liquid interfacial discharge technology becomes popular in the future, there may come a time when all industrial wastewater can be recycled.

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