Brown coal is similar to activated carbon in its ability to remove pollutants from waste water and exhaust air. It has the added advantage that it is much less expensive than activated carbon. Through its special properties, brown coal makes an excellent carrier material for microorganisms which decompose harmful substances. Bioactive brown coal filters can thus be developed, in which the absorbed toxins are broken down.
A combined filtering method using brown coal first and active carbon last offers a substantial reduction in costs while maintaining equivilent or even higher purification standards. The majority of pollutants are filtered out with inexpensive brown coal significantly increasing the life span of the activated carbon filter. |
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Brown coal has been proven successful in combating the following pollutants:
- mineral oil hydrocarbons
- polycyclic aromatic hydrocarbons
- chlorobenzine and other volatile halogenated hydrocarbons
- pesticides
- benzine, toluene and other solvents
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