In biofilters, harmful and odorous substances from waste-gas and exhaust-gas flows are decomposed to non-toxic, odourless and largely low molecular weight substances, such as carbon dioxide and water. This is done biochemically by the metabolic activity of microorganisms. For this purpose, the pollutant to be separated is first dissolved and microbiologically degraded.
It must be ensured that the metabolic activity of the microorganisms used can proceed at an optimum level. It is often useful here to use other substances such as, for example, phosphorus or trace elements.
We offers appropriate system types and construction tailored to the application
- Bio scrubbers, biofilters, biotrickling filters/ trickle bed reactors
- Single-stage or multi-stage – for example with upstream bio- or chemo-scrubbers
- Surface, circular and floor filters
- Container plants as well as compact and mobile biofilter plants
- Closed biofilter for targeted waste-gas flow guidance
In biofilters, microorganisms are settled on an organic substrate (e.g. bark or woodchips). In addition to the pollutants, this serves the organisms as a nutrient substrate. For pollutant removal, the waste gas is blown into the filter bed from the bottom to the top. With their simple design, biofilters can be operated cost-effectively in applications with low pollutant loading.
In contrast to biofilters, the microorganisms used are suspended in the scrubbing liquid in bio scrubbers. The pollutants are extracted from the waste gas and then biodegraded. Depending on the pollutant load, the decomposition occurs in the absorber sump or in an additional external regeneration reactor.
In biotrickling filters, inert substrates are used instead of the biological substrates in conventional biofilter methods, on which the microorganisms are settled. Organic and inorganic gaseous compounds are biochemically oxidised under aerobic conditions and converted into low molecular weight, non-harmful compounds which are no longer perceptible, such as carbon dioxide and water. The laden waste gas flows through the substrate in cross, counter and direct flow with respect to the trickling liquid.
Electrostatic Collection of Micro and Nanoparticles
Electrostatic filters use an electric field to clean process waste gases from particles. Our systems filter micro and nanoparticle-containing or aerosol-containing process waste gases as they occur.
For the treatment of condensable organic compounds, we offer an electrostatic condensate separator.