Category: Articles

A cyclonic wet air scrubber, or cyclone scrubber, is a wet air scrubber that uses both dry cyclone and spray chamber technologies for pollution control. The main scrubbing principle consists of two phases: the inlet gas enters the chamber and swirls through the chamber in a corkscrew motion; while the polluted gas swirls, cleaning liquid...

A baghouse is an air pollution control device that uses long cylindrical felt tubes as a filler medium. The polluted air enters the baghouse through hoppers; inside the scrubber, the gases move through fabric tubes that collect dust and particulate matter on their surface. Once a layer of dust has built up on the tubes...

Electroplating is a method that creates a thin layer of metal on a cleaned metal surface by utilizing electric current. The process involves cleaning and pretreatment of a metal surface with strong acids and surface-stripping agents, like caustic soda and chlorinated hydrocarbons. The process also involves other harmful and toxic substances, e.g. cyanides. Consequently, the vapors...

Accumulation of unwanted materials — clogging and fouling — is detrimental to the working function of a scrubber: it disrupts its working cycle and leads to complications and more frequent maintenance. The clogging of an air scrubber occurs due to the high particulate matter (PM) concentrations in the gas that is being treated. Over time...

Venturi scrubber is a type of wet air scrubber, which means that it uses water or other liquid to scrub air. It is designed to use the energy of an incoming gas stream in order to atomize scrubbing liquid. Venturi wet scrubbers are the most popular type of scrubbers; they have been used in the...

The packed bed is often used in air scrubbers, it is a hollow tube or pipe filled with a specifically designed packing material. Packed beds are used to improve contact between different stages of a chemical reaction or another process that is similar, for example, distillation processes or air scrubbing. The purpose of a packed...

To address the environmental effects of power plants that utilize specific difficult coal types, flue gas desulphurisation (FGD) strategies must be advanced to attain improved treatment quality and optimal operational efficiency. FGD technology is built on the chemical reaction that occurs between the warm exhaust gases and limestone. This reaction subsequently reduces around 90% of...

Air pollution ranks as the fourth leading overall risk factor for global human health, following high blood pressure, dietary hazards, and tobacco use. Among the major air pollutants, fine particulate matter is the most damaging to human health, and sulfur oxides, nitrogen oxides, and ozone are associated with a range of illnesses. In addition to...

The phenomenon of air pollution includes a sequence of events: the generation of pollutants and their release from a source; their transport and transformation in and removal from the atmosphere; and their effects on humans, materials, and ecosystems. Generally, either economically infeasible or technically impossible to design processes for absolutely zero emissions of air pollutants,...

Wet scrubbers clean air by trapping PM on wet surfaces and absorbing gasses into the liquid. In some cases, the gasses react with chemicals in the liquid, too. Small liquid droplets are more effective per unit volume of scrubber liquid because they have more surface area than fewer, larger droplets. Very small liquid droplets, however,...