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Waste gas treatment

As regards waste gas treatment, various practical procedures are applied and theoretical principles and computation fundamentals are established. These are necessary since waste gases from industry and various combustion processes contain many substances which are hazardous to health and the environment.

waste gas treatmentWaste gas treatment already commences during the combustion processes in the boilers. For this purpose, a specially designed and implemented procedure of the individual combustion stages is applied. In this regard, it is particular important to bind the generated nitrogen oxides by feeding ammonia which is sprayed as ammonia water. This process already takes place in the combustion chamber of a boiler.

During this process, other components concerning waste gas treatment, too, are separated. This includes, but is not limited to dusts or other drop-shaped substances.

The development of technologies for waste gas treatment resulted in the establishment of various technical processes. These comprise, for instance, the so-called absorption and adsorption process, waste gas treatment in a form called thermal post-combustion, as well as both catalytic and non-catalytic methods.
An especially performed de-dusting removes all solid and dusty hazardous substances from waste gases. Such solid substances are e.g. soot, heavy metals and coal dust. The latest waste gas treatment technologies are also based on biological cleaning. Biological waste gas treatment is based on special technical fundamentals. They are also applied for separating and filtering hazardous air contamination from industrial plants. For this purpose, bio-filters, biological scrubbers and biological percolator bed reactor are acceptable solutions. The operation of such systems is governed by specially elaborated VDI regulations for biological waste gas treatment.

Waste gas treatment is also required in connection with gaseous emission which results from vehicle exhaust gases. A variety of exhaust gases emerges from contaminated soils or large disposal sites. In this regard, carbon monoxide and hydrocarbons play an important role. Different technical approaches are applied for waste gas treatment in other cases. One of these procedures is the three-way catalyst. Other variants are the uncontrolled catalyst and the so-called oxidation catalyst.

A high degree of waste gas purity may be achieved by intact and extensive soot filters. The principle of waste gas recycling has also been proven and is employed where this technology is efficient and feasible. On basis of a modified conception of combustion motors, too – in practice known as lean mix engine – waste gas treatment is possible at the point of waste gas generation already.