Air | Wet dust collector


Physical air treatment: wet dust collector


  • Removal of dust particles from waste gases


The compact wet dust collectors ensure optimal removal of dust particles from waste gases. The wet dust collector combines the following items:
1. washing of the waste gas
2. centrifugal dust collection
3. post-filtration using a demister

Wet dust collector - scheme

The wet dust collector operates under a negative pressure because the fan is positioned after the collector. Note that the fan is the only process component with moving parts.

The dust loaded waste gases enter the dust collector through a vertical channel. The negative pressure creates a gas stream which flows along a curtain of water. This curtain is formed along a partially submerged baffle plate. Due to the high gas velocity and the strong turbulence at the liquid surface, water droplets are mixed with the waste gas, ensuring thorough washing and wetting of the dust particles.

In a second phase the waste gas passes through a labyrinth. Due to the specific shape of this part of the scrubber, the waste gas makes several rotations which force the dust particles to penetrate the water droplets and to become entrapped. At the same time, the centrifugal force in the labyrinth provides optimal separation of the wetted particles. Under influence of gravity, the particles collect and settle in the fluid reservoir.

The last phase is a demisting phase. If still some particles or water droplets are present in the treated waste gas, they will be retained in the demister. The demister mainly functions as a back-up and can easily be removed for cleaning. Only when the wet dust collector is not working properly (e.g. insufficient wash water), the demister will have to be cleaned regularly.


Contrary to bag filters, wet dust collectors can obtain an optimal removal of sticky or hygroscopic dust particles. Moreover, there is no risk of dust explosions and the separated dust particles can be recovered through the wash water.

Realisation example

Wet dust collector

Approach by Trevi

A small pilot installation is available for on site verification of applicability of this technique.

The wet dust collector is available in capacities from  250 m3/h up to 28 000 m3/h.