Oxidation with ozone
In oxidation, elements or compounds are combined with oxygen. In the process the substance to be oxidised emits electrons that are taken up by the oxidation agent. Ozone is a strong oxidation agent. Ozone is generated in so-called ozone generators. To this purpose dry air or technical oxygen (from PSA systems or from tanks) is conducted into a discharge cell with a strong alternating electrical field. In the process the oxygen molecules decompose and ozone is formed. Ozone is not stable: While decomposing, atomic oxygen remains which spontaneously reacts with water constituents or penetrates into cells.
Formation and decomposition of ozone
Oxidation agent for water treatment
Ozone is a strong oxidation agent. It is activated oxygen with a high specific oxidation potential (2.07 V).
|Oxidation agent||Potential in V||Oxidation agent||Potential in V|
|Hydrogen peroxide||1.78||Chlorine dioxide||1.27|
Due to its high oxidation potential, ozone produces a very fast oxidation of organic and inorganic water impurities. The HYDROZON® process utilises ozone both to oxidise the raw water and for the final disinfection of the pure water. Oxidation gives rise to, among other things, low-molecular, assimilable organic carbons (AOC). These carbons are mineralised in a biologically active filter bed that follows the oxidation.
The following are the main processes that occur in ozoning:
- Disinfection of the raw water
- Oxidation of iron to form iron hydroxide that can be filtered
- Oxidation of manganese to form brownstone that can be filtered
- Oxidation of arsenic to form arsenic that can be filtered
- Splitting of highly molecular organic compounds to optimize the biological mineralisation in the filter bed (ozone bio-filtration)
- Oxygen enrichment to supply the aerobic micro-biology in the biologically active filter bed
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Ozone (O3) is an instable molecule consisting of three oxygen atoms that decomposes into oxygen within a short period. It is a strong oxidation agent. Ozone is gaseous at room temperature and normal air pressure.
Ozone = activated oxygen.
Ozone is a colourless gas with a pungent odour.
Molar mass 48 g/mol
Density 2.144 kg/m³ (0 °C)