For industrial operators, residues of chemicals in used waters can be a stressful problem. Removal of dissolved organic pollutants is often challenging. At the same time, their maximum allowed emission levels are frequently regulated by legislative bodies and environmental authorities. Exceeding emission levels likely results in environmental problems and costly penalties.
The point of non-thermal plasma in water treatment is to use minimal energy. Using only electricity, Roxia Plasma Oxidizer synthetically creates the same oxidizing species that are most effective in natural processes. This powerful water purification technology uses ambient oxygen and the treated water itself as the source of these oxidants. The primary oxidants thus produced are hydroxyl radicals (OH) and ozone (O3). Processes using hydroxyl radicals for water purification are collectively referred to as advanced oxidation processes (AOPs).
Contaminants in the water are subjected to strong oxidation
We have brought plasma oxidation to a commercially available, industrial scale. Our plasma technology comes with low maintenance requirements and a high level of automation. Roxia Plasma Oxidizer is characteristic with:
Radical oxidants effectively break down organics
In contact with water, the high-speed electrons in non-thermal plasma enable the formation of OH-radicals and ozone according to the following equations:
| PRECURSORS | PRODUCTS |
| H2O + e- | OH + H + e- |
| O2 + e- | O + O + e- |
| O + O2 + M | O3 + M |
The atomic hydrogen as a product of the first equation is prone to reacting with molecular oxygen (O2), yielding hydroperoxyl radicals (HO2) which are also oxidants.
OH-radicals and ozone are very strong oxidants. This means that they can oxidize harmful organic pollutants. Oxidation of organics in its ultimate extent results in mineralization to carbon dioxide. Usually, complete mineralization is, however, not a requirement, allowing optimization of energy input.
In Roxia Plasma Oxidizer, the water falls like rain through a large plasma volume. This enables constant flux of abundant radical oxidants that effectively destroy organic contaminants, such as pharmaceuticals, biocides, surfactants and residual active reagents.
Various reactive oxygen species are present in plasma liquid contact. The most important ones are hydroxyl radical and ozone.
Plasma technology as a novel solution has been tested for successful degradation of dozens of pollutants from the following industries:
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