The wet treatment method can treat particulate matter in the exhaust gas and also remove gaseous pollutants contained in the exhaust gas.

The basic principle is to use the contact between gas and liquid to transfer pollutants in the gas to the liquid, and then separate the clean gas from the dirty liquid to achieve the purpose of purifying the gas.

After the granular pollutants in the exhaust gas come into contact with water or other liquids, the droplets or liquid films diffuse and adhere to the particles in the exhaust gas, or the particles agglomerate and become larger through humidification, using gravity, inertial force, heat and electrostatic force, etc. The purpose of separation and removal is achieved; while gaseous pollutants are transported into the liquid through turbulence, molecular diffusion and other mass transfer and chemical reactions to achieve the purpose of separation from the incoming gas.

Wet scrubbers are used as two main mechanisms for exhaust gas purification processes. First, they use scrubbing liquid to wet the particles, and second, they remove and separate the wetted particles.

As for the absorption of gaseous pollutants, one or more gas components in the gas flow are removed during the process of contact with the liquid by dissolving the gas in the liquid or reacting.