Purenviro - Carbon Filters

How does a carbon filter work?
A carbon filter works by leading the pollutant gas slowly through a layer of active carbon. The carbon is formed so that it has an extremely large surface that attracts odor and pollution. Some applications use carbon that has been added with Sodium Hydroxide, acid or catalysts. The pollutants stick to the surface of the carbon, and the gas is cleaned from pollutants and odor.

When do you choose a carbon filter?
A carbon filter often has a very high efficiency and should be chosen when there is a demand for a high removal rate. A carbon filter is especially well suited for odor removal and other compound gases with low concentrations. The filters can be constructed small and compact, and should be used on low gas flows. The smallest carbon filters can be delivered with an integrated fan.

Most important advantages with carbon filter:

• High removal rate >99%
• Low energy consumption
• Easy maintenance
• Demands little or no automation
• Choose optimal filter medium
• Takes up little space
• Adapt the shape of the filter to fit the room where it is placed
• Handles large variation in gas flow

Carbon filters have many applications, and are found in most industries. Designated as BAT in a number of sectors. By choosing the right type of filter medium, carbon filters can be used in a large number of applications. The list below shows only a few of those applications.

Odor from Pumping Stations
Carbon filters work well when removing odour from sewage, and can be built so small that they fit into pumping stations. We deliver filters with a built-in fan for simple placing and mounting to pumping stations.

Odor Reduction for Wastewater Treatment Plants
Carbon filters are also used for odor reduction in most wastewater treatment plants. A removal rate of 99% is achieved. All odor from dirty zones can be cleaned with carbon before it is released into the atmosphere.

Cleaning of H2S from Biogas
H2S in biogas is often a problem for gas engines. With special filter mediums, we can selectively remove H2S from the gas flow, which makes the gas better fit for energy production.

Removing Odor from Proteins and Fish Silage
We deliver a special type of carbon filter which is better suited for removing odor from fish oils and fish silage. These are normally applied to tank ventilation and small gas flows.

Removing Odor from Sewage Sludge
When cleaning wastewater, there are many processes which produce odors. Handling sludge is particularly odor intense. Odour from sludge is handled effectively with carbon filters.

Cleaning Sour Gases
When distinctive pollutants are present, there are demands for a special kind of filter. We deliver filters which catch and clean sour gases like hydrochloric acid, HCl.

Tank Ventilation
Carbon filters can be built in small sizes and handle variation in gas flow. They are well suited for cleaning gas from tank ventilation. We have good experience in using carbon filters in those applications.