Wet Scrubbers

Wet scrubbers remove dust particles or particulates by capturing them in liquid droplets, the liquid can also be used to absorb or dissolve pollutant gases.

Hence wet scrubbers can be used to eliminate both particulates and impure gases. To avoid any droplets from scrubber escaping with the outlet gas a component called entrainment separator is used. The scrubbing liquid should be discharged or reused only after proper treatment of it.

 Wet scrubbers can be made in number of configurations but in design we need to ensure proper contact between liquid and gasses to be purified so as to remove the particulates efficiently. The ability of wet scrubber to eliminate particulates is proportional to the power input. To collect particles larger than 5 micrometers the spray tower type wet scrubber is suitable. To collect particles of size 1 micrometer or less than this the high efficient and high energy consuming devices like venturi scrubbers and condensation scrubbers are suitable.

 The wet scrubbers are the only air pollution devices which can remove both the particulates and pollutant gasses. But it leads high pressure drops and also Due to strict air pollution control regulations the wet scrubbers are rarely used as primary device to control particulates. But it is used in series with other type of air pollution control equipments mainly for the control of acid gas emissions.

In addition to this it has advantages like minimal fire hazards, can handle high temperature and high humid gas stream, and due to the cooling effect the volume of the exhaust stream is reduced which intern leads to reduced size of exhaust system components.