Aeration and degassing are used to remove unwanted gases from water while simultaneously increasing dissolved oxygen levels. The technology is commonly applied in groundwater and well water treatment where substances such as radon, hydrogen sulfide, carbon dioxide and methane may occur naturally. Aeration is also frequently used as a first step for oxidizing dissolved iron and manganese so that these substances can subsequently be removed by filtration.
Aeration in Atmospheric Tanks
Aeration and degassing are often performed in an open or atmospheric tank where water is exposed to air. This allows dissolved gases such as radon, hydrogen sulfide, carbon dioxide and methane to be removed while increasing dissolved oxygen levels. The process can also assist in the oxidation of iron and manganese prior to filtration.
In some systems, aeration is combined with ozone injection. Ozone acts both as a powerful oxidizing agent and as an effective barrier against many microorganisms. The combination of aeration, ozone and downstream filtration can improve odour, colour, microbiological quality and the removal of iron and manganese.
Suitable for
- Radon
- Hydrogen Sulfide (Rotten Egg Odour)
- Iron
- Manganese
- Carbon Dioxide
- Methane
- Unpleasant Odours and Taste
Advantages
- Robust and Proven Technology
- Low Chemical Consumption
- Effective for Many Dissolved Gases
- Can Improve Downstream Filtration
- Can Reduce Odour and Taste Issues
Limitations
- Does Not Remove All Types of Contaminants
- Often Requires Subsequent Filtration
- May Require Additional Disinfection
- Certain Gases May Require Specialized Equipment
When aeration is used for iron or manganese treatment, these substances are oxidized. In practice this means they are transformed from dissolved substances into solid oxygen-containing compounds. Iron forms rust-like particles while manganese forms solid manganese oxides. These particles can then be removed through filtration.
When water is aerated it is intentionally brought into contact with air. If the treated water is intended for drinking purposes, a downstream hygienic barrier such as UV disinfection is often recommended to reduce the risk of bacterial growth or recontamination within the system.