The whole truth about gas scrubbing

The process of scrubbing is complicated and needs the use of special nozzles that help to take away pollutants and other chemical contaminants from process gases, liquids, and equipment. For example, coal fired power plants use scrubbers with the aim of removing sulphur oxides from boiler exhaust, also it is possible to take away nitrous oxides from combustion streams, acids from chemical processing off gases, disinfectants from drinking water, particulate materials from process gas or smells from water treatment plants.

It should be mentioned that there are two types of scrubbers: dry scrubber and wet scrubber. Dry scrubbers also use fluid, but its amount is smaller than in wet scrubber system. The limited scrubbing fluid gets in the gas flow, so it volatilizes completely, leaving just a gaseous or solid element that will react with the pollutant and allow it to be taken away from the system. Dry scrubber system is widespread used for acid gases removing from combustion streams through an alkaline slurry injection.

Wet air scrubbers are more frequently used, they allow removing sulfur dioxide from coal-generated gas. Their design enables to collect both particulate and gaseous contaminants. Moreover, air scrubbers are highly versatile and their applications are not limited. Wet scrubber system takes away pollutant particles by collecting them in liquid droplets. The main advantage of wet air scrubbers is their capacity to withstand high temperatures. Also they cool the flue gases.

Among wet scrubbers, the most common ones are venturi wet air scrubbers, packed bed wet scrubbers, and cyclonic spray scrubbers.

Whereas, venturi wet air scrubbers are the most effective for a particulate matter collection. The scrubber has a decreased pressure drop and a wide range of operating modes (contact time, number of grids, and suchlike) that enable to solve numerous (from dust to chemical) tasks. Nevertheless, venturi scrubbers are not productive at gas scrubbing.

Packed bed scrubbers are quite useful for gas scrubbing because high concentrations of particulate matter clog the bed easily. The fields of application: chemical processing industry, petrochemical industry, manufacturing industry, waste management industry, pharmaceutical industry, steel industry, incinerators, halogen removal, humidification, odor control, VOC removal.

The use of cyclonic scrubbers is limited by particulate matter collection. Meanwhile, they are less effective than venturi scrubbers because they cannot produce the same degree of useful turbulence. As for gas scrubbing, cyclonic wet air scrubbers are able to take away only very soluble gases.

Both dry and wet scrubbers can be used for an odour control at the factories. The majority of industrial processes, for example, waste storage, incineration, wastewater treatment, chemical processing, food processing etc., produce unpleasant smell that must be treated. The solution is the use of coverants, deodorants or absorbents that can be used in open type or packed bed type scrubber systems.

If you search for the best air treatment device to improve air quality, you can buy a high-tech completely new type of wet scrubber – a Multi-Vortex wet air scrubber produced by Redwood Technology.

Redwood technology is a fast-growing vendor of wet air scrubbers. The multi-vortex scrubber can remove gas emissions, dust, vapors, and other pollutants from a gas stream. It is an innovative technology created to save water that makes it more cost-efficient and differs from other types of scrubbers.  If you have any questions or would like to purchase a multi-vortex wet air scrubber, please contact us at

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