WESSEL-UMWELTTECHNIK GMBH

Biological exhaust air cleaning is always required if exhaust air needs to be purified of volatile organic components the socalled VOCs or odorous substances. The demand for biological procedures has increased in recent years. On the one hand, biological exhaust air cleaning does not generate any climaterelevant greenhouse gases. On the other hand, it meets all legal requirements for clean gas values. With over 200 biological exhaust air cleaning processes installed, Wessel has comprehensive practical knowhow and is the technology leader in the field of biological exhaust air cleaning. The biological exhaust air cleaning systems have been continuously optimised and further developed by WesselUmwelttechnik for decades. The modern cleaning systems from WesselUmwelttechnik work efficiently. Thanks to the continuous monitoring of the plant parameters, they require only a minimum of operating effort.

Bio scrubbers are systems for the biological cleaning of exhaust air and exhaust gases and thus for the reduction of odours and polluting emissions. In this process, air polluted with a wide variety of pollutants is cleaned with the aid of a washing liquid which is loaded with microorganisms and biocatalysts (various enzymes) taken from nature. The bio scrubbers from WesselUmwelttechnik work almost without wastewater and are therefore very sustainable, regardless of the nature of the exhaust air. The basic requirement, however, is that the ingredients are watersoluble and bioavailable. WesselUmwelttechnik supplies turnkey plants like the Wessel BIOCATScrubbers in single and multistage construction.

A bio scrubber combines physical scrubbers with a biological activation unit. In this process, air polluted with a wide variety of pollutants is cleaned with the aid of a washing liquid which is loaded with microorganisms and biocatalysts (various enzymes) taken from nature. The washing water absorbs the exhaust air and pollutants from the air. Subsequently, added microorganisms oxidise them. These microorganisms use the air pollutants as substrate and nutrient medium and convert them into naturally formed decomposition products such as CO2, water, and biomass. Here, the washing water is continuously regenerated and used in a closedcircuit water treatment system. TYPICAL APPLICATION AREAS These plants are primarily used for watersoluble ingredients of the exhaust air. The usual pollutants that are filtered from the exhaust air with the help of bio scrubbers include aldehydes such as formaldehyde, alcohols, ketones and other hydrocarbon compounds.

The BIOCATDUOscrubber from WesselUmwelttechnik consists of two units. One unit is the already mentioned BIOCATscrubber. A second unit, the DLP (Dust Low Pressure) scrubber stage, is a cleaning stage for separating dust and fine fibres from the exhaust air. With the BIOCATDUOscrubbers from Wessel, gaseous pollutants as well as dust can be removed from the exhaust air at the same time. The BIOCATDUOscrubbers have two separate washing water circuits for this purpose. It is characterised by a compact design, as both units are housed in one column. COMMON USE CASES The BIOCATDUOscrubbers are used in the woodbased panels industry, for example. More precisely where MDF boards (medium density fibre) and moulded fibre parts are produced. Here the exhaust air contains fine wood fibres which have to be filtered out of the exhaust air. Furthermore, pollutants and odours must also be reduced.