Filter Press Types

Plate and Frame Filter Press

Plate and frame filter press consist of alternately arranged filter plates and frame to form a set of filter chambers. The surface of the filter plate is grooved, and the protruding part of the filter plate is used to support the filter cloth. The edge and corner of the filter frame and the filter plate have through holes, which form a complete channel after assembly, and can enter suspension, wash water and drain filtrate. Each side of the plate and the frame has a handle supported on the cross beam, and the plate and the frame are pressed by the compression device. The filter cloth between the plate and the frame acts as a sealing gasket.

When working, the slurry is pumped into the filter chamber by the feed pump to form a filter cake on the filter cloth until the filter chamber is filled. The filtrate passes through the filter cloth and flows along the filter plate groove to the channel at the edge and corner of the plate and frame, and is discharged centrally. After filtering, the filter cake can be washed with clean water. After washing, compressed air is sometimes introduced to remove the remaining detergent. Then open the filter press to remove the filter cake, clean the filter cloths, re-press the plate and frame, the next filter cycle is started.

Plate and frame filter press is suitable for slurry with high compressibility or near incompressibility of filter residue. The suitable concentration of solid particles in suspension is < 10%, and the operating pressure is 0.3-0.6 MPa. The filter area can be increased or decreased with the number of filter plates used. The plate frame is usually square, the inner edge of the filter frame is 200-2000 mm long, the thickness of the frame is 16-80 mm, and the filtering area is 0.5-1200 square meters.

Chamber Filter Press

The structure and working principle of the chamber filter press are similar to that of the plate and frame filter press. The difference is that the two sides of the filter plate are concave. Each two plates are combined into a chamber-shaped filter chamber, omit the filter frame, There is a circular hole in the center of the filter plate from which the slurry flows into each filter chamber. Chamber filter press is suitable for slurry that need to be filtered under high pressure without washing the filter cake.

Vertical Filter Press

The filter plates of vertical filter press are superposed both horizontally and up and down to form a group of filter chambers, which occupies a small area. It adopts a continuous filter belt, after the completion of filtering, it moves the filter belt and unloads the filter cake and cleans the filter belt. The operation is automatic.

Vertical filter press has a wide range of applications and simple structure. Compression and opening of filter plate and frame, filter cake discharge and filter cloths cleaning can be operated automatically, which is conducive to the large-scale use of filter press. After the elastic rubber diaphragm is added to the filter chamber of the filter press, the filter cake can be compressed with high pressure water or compressed air at the end of the filter, and the filter cake can be further compressed and dewatered.

Belt Filter Press

Belt filter press is widely used for sludge dewatering in municipal sewage treatment, electroplating, papermaking, leather, brewing, food processing, coal washing, petrochemical, chemical, metallurgical, pharmaceutical, ceramic and other industries.

Belt filter press has 3 working zones, i.e. gravity dewatering zone, wedge compression dewatering zone and shear dewatering zone. Its compression type belongs to two-dimensional compression and is an ideal equipment for sludge dewatering. However, the dewatering effect of belt filter press depends on chemical agents, which results in high cost of sludge treatment.

Membrane Filter Press

Membrane filter press is an intermittent filter press equipment, which is used for solid-liquid separation of various slurry. The membrane filter press equiped with a layer of elastic membrane between filter plate and filter cloth.

In the process of working, when the feeding is finished, the high-pressure fluid or gas medium can be injected into the membrane plates, at this time, the whole membrane will drum up to compress the filter cake, thus realizing further dehydration of filter cake. Membrane filter presses achieve the lower residual moisture values in the filter cake than traditional filtration processes.

5 Types of Filter Press Comparison

Types

Advantages

Disadvantages

Plate Frame Filter Press

Sludge dewatering is more thorough than belt filter press,moisture content of the treated sludge cake is lower.

Intermittent operation, sludge treatmentefficiency is low,more manual operation.

Belt Filter Press

Continuous operation mode, High sludge treatment efficiency and capacity.

Sludge dewatering is incomplete, mud cake can not be formed;Filter belt needs to be washed with a large amount of water.

Chamber Filter Press

Filter chamber is composed of two adjacent filter plates.It is convenient to change the filter cloths.

Low efficiency, poor filtration effect;The filter plate is easy to break down.

Membrane Filter Press

The efficiency of sludge treatment is higher than that of Plate Frame Filter Press; Municipal sludge water content can be treated to 70% – 75%.

High pressure water system is needed;Cost higher than ordinary plate and frame filter press.

Vertical Filter Press

Short feeding time; fully automatic operation;low moisture content of filter cake; high output;

Vertical filter press has complex structure and high operation and maintenance cost

The Sludge Dewatering Screw Press can be widely used for various wastewater treatment systems such as municipal, petrochemical, chemical fiber, paper making, pharmaceutical, leather and other industrial water treatment system. Also it can be used for Dairy Farm Manure Treatment, Palm Oil Sludge, Septic Sludge, etc. The practical operation shows that Dewatering Screw Press can bring considerable economic and social benefits for users.

Beverage processing	Dairy industry	Meat Processing	Mining industry	Municipal Wasterwater
Paint factory	Paper Mill	Petrochemicals	Printing and Dyeing	Sewage Treatment