Division 14.2 Emissions to air
United Kingdom
| Technique | Description |
|---|---|
| Bag filter | Bag filters, often referred to as fabric filters, are constructed from porous woven or felted fabric through which gases are passed to remove particles. The use of a bag filter requires the selection of a fabric suitable for the characteristics of the waste gas and the maximum operating temperature. |
| Cyclone | Dust control system based on centrifugal force, whereby heavier particles are separated from the carrier gas. |
| Non-thermal plasma treatment | Abatement technique based on creating a plasma (i.e. an ionised gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge) in the waste gas by using a strong electrical field. The plasma oxidises organic and inorganic compounds. |
| Thermal oxidation | The oxidation of combustible gases and odorants in a waste gas stream by heating the mixture of contaminants with air or oxygen to above its auto-ignition point in a combustion chamber and maintaining it at a high temperature long enough to complete its combustion to carbon dioxide and water. |
| Use of gaseous fuels | Switching from the combustion of a solid fuel (e.g. coal) to the combustion of a gaseous fuel (e.g. natural gas, biogas) that is less harmful in terms of emissions (e.g. low sulphur content, low ash content or better ash quality). |
| Wet scrubber | The removal of gaseous or particulate pollutants from a gas stream via mass transfer to a liquid solvent, often water or an aqueous solution. It may involve a chemical reaction (e.g. in an acid or alkaline scrubber). In some cases, the compounds may be recovered from the solvent. |