Panasonic Photocatalytic Purification Technology

Gentle on the environment; detoxify harmful substances in drinking water

Photocatalytic water purification technology creates safe water by utilizing sun’s ultraviolet rays and photocatalysts to react with harmful substances in the water, rendering them harmless. Compared to chlorination or chemical purification, the impact on the environment is minimal, and it provides the advantage of detoxifying the remained harmful substances after chlorination.

Titanium dioxide (TiO2) is one of the most well-known superior photocatalyst. When it is placed in water and exposed to ultraviolet light, the energy of that light is transmitted to the electrons in the titanium dioxide particles, and high-energy electrons (electron excitation) are generated on the surface of particles In addition to purifying toxic metals like arsenic and hexavalent chromium, these high-energy electrons react with oxygen in the water to generate reactive oxygen, purifying bacteria and organic substances.

Reactive oxygen is also generated when the surface of photocatalytic particles from which electrons have already been ejected come in contact with water, contributing to the efficiency of the water purifying effect.

50-100 times faster than conventional process, as much as 99.9% of toxic substances removed

The new photocatalytic particle greatly enlarges the surface area of the photocatalysts, allowing for major acceleration of the purification speed, as compared to fixed photocatalysis: 100 times faster for the processing of non-biodegradable organic ssubstances, and 50 times faster for arsenic. In addition, this technology not only eliminates organic substances and microorganisms, but also detoxify as much as 99.99% of toxic metals, which had previously been difficult to eliminate from groundwater. This makes it possible for problematic sources of groundwater to be renewed as sources for drinking water.
Water purification equipment utilizing this technology is based on the simple process of mixing the photocatalytic particles into the water, applying sunlight to purify it, and then removing the particles afterward, so it is possible to create a small-scale, recycling-oriented water purification system at a community scale. Panasonic’s technology will contribute to the realization of a world in which people can find clean water to drink anywhere.

 

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