Wet Scrubbers

Wetted Packed Towers are the simplest and most commonly used approaches to gas scrubbing.


Wet Scrubbers
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High Efficiencies, Low Running Costs

Wetted packed towers can be designed for very high efficiencies with relatively low capital and running costs. The low-pressure drop associated with packed bed scrubbers permits the use of smaller more economical fans. Although efficiency may be affected, a packed tower will usually function when gas or liquor flows vary from its original design parameters.

Packed Tower Scrubber

Wetted Packed Towers are the simplest and most commonly used approaches to gas scrubbing.

  • Large wetted area method to remove containments from gas flow
  • Uses loose-filled random packing
  • Low running costs and capital investment

Fluidised Bed Scrubber

In a fluidised bed scrubber the typical single bed of a packed tower structure is replaced by two or more shallow beds, and the high surface area angular packings are replaced by hollow ellipsoids which are fluidised by the gas stream.

  • Contains two or more shallow beds
  • Compact unit size with narrow diameter
  • Minimal aggregation of particulates
  • Not usually suitable for odour control

Venturi Scrubber

Venturi scrubbing is a most effective technique for the removal of particulates from a gas stream, even down to sub-micron size.

  • Brings together scrubbing liquor and gas stream within venturi throat
  • Cost effective and efficient scrubbing technique
  • Often used in combination unit

The Process

The principle of this type of scrubber is to remove contaminants from the gas stream by passing the stream through a packed structure which provides a large wetted surface area to induce intimate contact between the gas and the scrubbing liquor.

The contaminant is absorbed into or reacted with the scrubbing liquor.

The packing of the tower is normally a proprietary loose fill random packing designed to:

  • Encourage dispersion of the liquid flow without tracking
  • Provide maximum contact area for the ‘mass transfer’ interaction
  • Offer minimal back pressure to the gas flow


N.B. The information contained in this entry is provided by the above supplier, and does not necessarily reflect the views and opinions of the publisher