Knowledge bank
What is a filter press?
A filter press is an efficient solution for mechanical dewatering and separation of solid and liquid phases in industry. Filter presses are mainly used for separating slurries or other suspensions, where the result is a clear liquid phase and a dry filter cake.
By applying high pressure, the liquid is forced through filter cloths or filter plates, while the solid particles are retained. Depending on the process, either the solid or liquid fraction can be the desired end result.
How does a filter press work?
A filter press works by pressing filter plates together with great mechanical force. The medium to be separated is pumped between the plates and the liquid is forced through the filter medium, while the solid particles gradually build up a filter cake.
The principle is similar to straining juice from cooked berries. The harder you press, the more liquid you get out. The same basic principle applies in a filter press - the right combination of pressing force and cycle time gives maximum dewatering and high dryness in the filter cake.
To achieve optimal output, it is crucial that the filter press is correctly sized for the application.
What types of filter presses are available?
There are several types of filter presses, all based on the same basic principle, but adapted to different capacity, automation and working environment requirements.
Common designs are:
- Chamber filter presses
- Membrane filter presses
- Manual filter presses
- Fully automatic filter presses
The choice depends, among other things, on whether the process is batch or more continuous, and on the requirements for efficiency, safety and staffing.
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