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At apurio Umwelttechnik GmbH, we combine decades of expertise with state-of-the-art technology to provide you with top-notch solutions in the field of exhaust air purification systems. Browse through our product overview and find exactly what your company needs.

Mechanical Filtering Separators

Mechanical filtering separators represent the most common method for purifying industrial exhaust contaminated with particles. They consist of a housing and filter elements (filter media) installed inside. The contaminated air is passed through the filter media, where the particulate exhaust components are separated on the filter media. Small particles are primarily removed through diffusion, larger ones increasingly through blocking and inertia. If the air is not to be discharged outside but returned to a building, a HEPA (High Efficiency Particulate Air filter) stage (particulate filter) can be added to the process.

Dry Separator air

A dry separator is an effective method of exhaust air purification, removing dry dust from the exhaust air using filter media. Without the use of liquids, this separator ensures a clean and dust-free atmosphere.

#Removes: Particles (solid)

#Mechanical Filtration

The MQL separator is used for filtering dust with lubricants from the exhaust air. It utilizes pre-filters and coalescence filters to ensure that the exhaust air is rid of potentially harmful particles.

#Removes: Particles (liquid + solid)

#Mechanical Filtration

dust separator
Oil Mist Separator Air

Oil mist separators and emulsion mist separators are methods for effectively removing lubricant particles from the exhaust air using coalescence filters. For entrained solids, a pre-filter can be installed.

#Removes: Particles (liquid)

#Mechanical Filtration

Wet Separator

In the wet separator, the contaminated exhaust air is brought into contact with a washing liquid. The exhaust air constituents in the air transfer to the liquid phase. In this process, the exhaust air can be dispersed into the liquid (e.g., in a nozzle bottom scrubber) or the liquid into the exhaust air (e.g., via the Venturi principle in a Venturi scrubber). Alternatively, the exhaust air can be passed through liquid-wetted surfaces (e.g., in a washing tower, designed as a packed column or tower).

Depending on the washing agent used, a distinction is made between a physical wet separator (usually water) and a chemical wet separator (acidic/alkaline detergents). The washing liquid in the chemical wet separator is alkaline when the exhaust air constituents are acidic (alkaline scrubber) and vice versa (acid scrubber).

The Venturi scrubber is an efficient system for removing dust (and gases) from exhaust air streams that are difficult to treat using dry separators. The special design, which directs gas through a narrowed section (Venturi throat), achieves high velocity, generating an intense washing effect when combined with added water.

#Removes: Particles and Gases

#Wet Separator

venturi scrubber exhaust air technology
packed scrubber air

The scrubbing tower is a proven solution for gas cleaning, constructed as either a packed column or packed bed column. It efficiently functions as a chemical scrubber, i.e., an acid or base scrubber, to effectively remove unwanted gases and ensure clean exhaust air.

#Removes: Mainly Gases

#Wet Separator

A nozzle plate scrubber is a specialized exhaust air purification system that ensures intense contact between exhaust air and washing liquid using nozzle plates as bottoms in a bottom column.

#Removes: Mainly Gases

#Wet Separator

Nozzle Plate Scrubber

Biological Processes

Biological exhaust air purification processes refer to those methods in which the constituents present in the air are degraded within a controlled separation system by microorganisms, converting them into non-harmful or low-odor degradation products (biofilters, biowashers, biotrickling filters). Biological processes are suitable for exhaust air constituents that are biodegradable over short periods, non-toxic, and present in the correct concentration. These include especially straight-chain, water-soluble, non-halogenated hydrocarbons with an even number of carbon atoms. The exhaust air should be moist, grease and dust-free, and ideally have a temperature of approximately 25-30°C. For this purpose, the exhaust air may be pre-conditioned accordingly.

Biofilter systems utilize microorganisms on an organic substrate material to remove harmful gases and contaminants from the exhaust air. Through this biological process, pollutants are transformed into harmless substances, effectively purifying the air in a natural way.

#Removes: Gases

#Biological Process

biofilter system air

Adsorption Processes

Many specific exhaust air issues can be solved using adsorption processes. In adsorption plants, the exhaust air constituents (adsorbate) adhere to a receiving solid material (adsorbent). Here, the adsorbate diffuses through the boundary layer into the pores of the adsorbent and adsorbs there with the release of heat. An adsorbent is thus more effective the larger its specific surface area. The apparatus in which adsorption is carried out is called an adsorber.

The designs are divided into adsorbers with stationary adsorbent (fixed bed adsorbers) and adsorbers with moving adsorbent (e.g., moving bed, fluidized bed, or streamwise adsorbers).

A commonly used adsorbent with a wide range of applications is activated carbon, and the separator is then called an activated carbon filter. For a small number of substances that cannot be reliably removed using activated carbon, impregnated activated carbon can be used. This is used, for example, for the removal of sulfur dioxide, hydrogen sulfide, ammonia, or mercury. Depending on the application, activated carbon can be replaced regularly or regenerated through desorption.

#Removes: Mainly Gases

#Adsorption Process

Activated Carbon Filter Air

In certain situations, simply exhausting air from a specific area is sufficient, and comprehensive exhaust air purification is not necessary. This is the case, for example, when legal pollutant limits are not exceeded or when the operation is only activated under exceptional circumstances. However, the gas to be discharged in this defined area may still pose a hazard, such as in the form of hot air or emergency exhaust gases.

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Didn’t find the product you were looking for or are you not sure which product best suits your needs? Then please contact us and let us find out together which solution best suits your application.

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