A plate and frame filter press is a type of filter press commonly used for solid-liquid separation. It consists of a series of filter plates and frames arranged alternately, with a filter cloth or paper in between. The plates are typically made of polypropylene, cast iron, or stainless steel, and have grooves or channels to allow the filtrate to flow out of the press.
The process of using a plate and frame filter press involves feeding a slurry mixture of solids and liquid into the press, where it is pumped into the spaces between the plates. The liquid component of the mixture, or the filtrate, passes through the filter cloth or paper and is collected in a tray or tank underneath the press, while the solids are trapped in the spaces between the plates.
Once the filtration process is complete, the press is opened, and the filter cake, which is the accumulated solids, is removed from the plates. The filter cloth or paper is then cleaned or replaced, and the press is ready for another filtration cycle.
Plate and frame filter presses are commonly used in a variety of industries, including food and beverage, pharmaceuticals, chemicals, and wastewater treatment, among others. They are known for their versatility, high filtration efficiency, and easy operation and maintenance.
There are several types of plate and frame filter presses available in the market, and some of the most common ones are:
The selection of a specific type of plate and frame filter press will depend on the specific requirements of the application, including the type of solids and liquid being filtered, the required filtration efficiency, and the desired level of automation.
Plate and frame filter presses are widely used in various industries for solid-liquid separation applications. Some common applications of plate and frame filter presses include:
Overall, plate and frame filter presses are a versatile and effective solution for a wide range of solid-liquid separation applications across many industries.
There are three basic categories of filter press plates: recessed chamber, membrane squeeze (diaphragm squeeze) and plate and frame. Continue reading to learn the differences between each type of design.
These filter plates are utilized in various brands of recessed chamber filter presses, and represent the most commonly used plate.
Link to BRIGHT
CGR is an acronym for Caulked, Gasketed, Recessed chamber. CGR filter plates should provide a virtually leak-proof filter press. Filter cloths for these plates are octagon shaped, with a caulking rope or cord sewn into the edge of the cloth.
NG means Non-Gasketed. The NG cloth is faster and simpler to install, though the tradeoff is that occasionally some dripping can happen when using NG cloths.
To learn more about filter cloths, take a look at our filter cloth page.
In a typical filter press application, approximately 80% of the solids are pumped into the press in the first half of the cycle, with the remaining half considered the consolidation stage. With membrane squeeze, the cycle is shortened and the cake moisture content is reduced (see chart).
The result is increased throughput and better liquid recovery. Adding membrane squeeze to a filter press requires a specialized plate stack, a squeeze water manifold, and a filter plate pressurization system. Typically, membrane plates are alternated with standard chamber plates in a mixed pack as shown in the photo below.
Contact M.W. Watermark to discuss which type of membrane squeeze plate may be best suited for your particular application. If chemical compatibility is a concern, various materials of construction are available for replaceable diaphragms, including EPDM, NBR, Viton, and more.
Plate and frame is the oldest of the filter plate designs, but is still useful in certain applications.
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