In waste water treatment systems, a Filter Press is commonly used in three applications: as a fixed volume, batch pressure filter; as a polishing filter to remove solids from a stream; and as a variable volume filter through a filter plate.
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Filter press is a separation process, specially employed by solid/liquid separation using the principle of pressure drive, provided by a slurry pump.
Filter press is a fixed volume and batch operation, which simply means that the operation must be stopped to discharge the filter cake before the next batch can be started.
The major components of filter press are skeleton and filter pack. The skeleton holds the filter pack together while pressure is being developed inside filter chamber. It however can only hold a specific volume of solids.
In operation, slurry is pumped under pressure into the press chambers through the manifold at the stationary head of the filter press. As each chamber fills with slurry, the liquid passes through the cloth medium, across the drain-field, through the drain ports and exits via gravity out of the corner discharge eyes.
The prime function of the filter media is to provide a porous support structure for the filter cake as it develops and builds.
Initially, some solids may pass through the cloth media causing a slight turbidity in the filtrate, but gradually the larger particles within the slurry begin to bridge the openings in the media reducing the effective opening size. This allows smaller particles to bridge these reduced openings initiating the cake filtration process.
Once a layer of solid particles achieves 1 to 2 mm in thickness, this “precoat” layer serves to separate out finer and finer particles as the cake builds in thickness, yielding a filtrate that is very low in turbidity.
Maintaining a clean environment, production of food and beverages, and development of essential medicines require filters that separate solids from liquids.
EPC offers filter presses for a wide variety of applications and industries, ranging from treatment of wastewater sludge and drinking water, the food and beverage industry, the chemical industry, pharmacy and mining, to paper production.
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- Minerals and inorganic products/mining
- Industrial & municipal wastewater treatment
- Food & pharmaceuticals