Waste-gas and exhaust gas treatment

Waste-gas and exhaust gas treatment

The terms waste gas and exhaust gas are used synonymously because of the partial non-uniform use in TA Luft and other sources.

Likusta systems of various types are designed for the removal of harmful components from the gas phase. We specialise in systems for chemical as well as biological waste-gas treatment.

Waste-gas treatment through gas scrubber Likusta
Waste-gas treatment through gas scrubber
Chlorine gas neutralisation Likusta
Chlorine gas neutralisation

Chemical waste-gas treatment

With chemical absorption, an ion, atom or molecule is absorbed into the free volume of the absorbing phase. The process of gas scrubbing is used, among other things, for the treatment of industrial waste gases or for the removal of odours. As an absorbent, water is used and - depending on the pollutant - the addition of specific chemicals (chemisorption) takes place. In most cases, very high treatment performance is achieved.

To achieve the required treatment performance at low operating costs, Likusta designs and manufactures various kinds of scrubbing types for different applications such as

  • Counter-flow scrubber

  • Cross-flow scrubber

  • Direct-flow scrubber

They can be installed in one or more stages or can be used as emergency units.

In addition to scrubbers, Likusta offers activated carbon filters for the adsorption of air pollutants. Activated carbon is fine-grained carbon with a highly porous structure and a very large surface. By attachment on the inner surface of the activated carbon, harmful or odorous substances are removed from gases, vapours and liquids.

In Likusta activated carbon filters our proprietary Likucarb activ is employed. They can be used to eliminate a wide range of harmful or odorous substances such as

  • Hydrogen sulphide

  • Indole and skatole

  • Methylmercaptane

  • Methylamines

  • Ammonia

  • VOC

Biological waste-gas treatment

In Likusta 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. As a specialist in dosing technology, Likusta would be happy to assist you with your project.

Likusta 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

Biological waste-gas treatment through biofilter Likusta
Biological waste-gas treatment through biofilter
Top view on organic substrate Likusta
Top view on organic substrate

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.

Experience and references from a variety of industries

Likusta gas scrubbers and filters are successfully used in various industries including:

  • Waste-water treatment

  • Waste treatment and composting

  • Chemical industry

  • Food processing

  • Feed production


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