Environmental technology for retrofitting: multiple filters for the exhaust pipe

In the fight against unwanted odour emissions, Bavarian filter specialist Fritzmeier Umwelttechnik has come up with something: an easy-to-retrofit hybrid system that filters the process air three times. If this is not enough, several of the COALSI multi-chamber filters can be connected in series - until the last odour molecule is neutralized.

Fritzmeier has developed the compact filter for companies whose process exhaust air pollutes employees and residents. It is suitable for passive as well as active venting via fans. The system is used in the passageway or end strand of the ventilation pipe. An electrical connection is not required.

There are four hybrid mat modules inside. Each module filters physically, chemically, and biologically. The highlight is the “odor-eating” organisms: They metabolize typical odour generators such as hydrogen sulphide and ammonia. In the physical part, the substances are retained solely by the mechanical action of the filter material. A mat made of activated carbon is responsible for chemical filtering. The porous, fine-pored carbon acts catalytically and thus neutralizes many odorous components. This is where the smaller molecules in particular get stuck. If the filter performance is not sufficient, several modules can be installed one after the other. Parallel operation in the branch is also possible. According to Fritzmeier, the gas flow rate is barely affected, as the filter surfaces are completely flowed through. Depending on the application, up to 99 percent odour retention is possible.

The system originated in the municipal sector, where smaller versions have proven effective as street sewer filters against sewage odors. For large volumes, the manufacturer builds electronically controlled stand-alone devices that filter thousands of cubic meters per hour. Depending on the load and flow rate, the service life of the filter mats is around one year. The change is carried out quickly and cost-effectively by the user himself. The material is neither human, plant nor animal pathogenic and therefore harmless to health.

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