Water scrubbing systems can be used as an alternative means of removing paint solids from the exhaust airstream. The booth has a water system, often in a tank that forms the base of the booth, paint-laden air is drawn from the booth and subjected to high pressure water sprays that separate paint particles; the exhaust air is de-watered before being discharged to atmosphere.
A feature of the water washed booth is the use of moving water to present targets for spraying against; in a down-draught booth this can be by flood sheets arranged below the grid working floor, in cross-draught booths one of the walls can be flooded as a collection screen.
Booth water requires chemical dosing to break up the constituent parts of the paint and remove all stickiness. The advantage of water washed spraybooths is consistent performance in terms of air movement, provided that the booth is correctly maintained.
The water tank must be emptied periodically, and disposed of as a controlled waste.
There are numerous options available that make cleaning of the washing system easier, with automated systems available that collect paint waste in bins for disposal.
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