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Press filter or pressure filter

Press filter or pressure filter

Filter press is one of the most common wastewater treatment systems that performs solid separation from liquid under pressure. A set of movable plates, filtration cloths and pumps and hydraulic jacks ultimately provide the conditions in the jump filter device to separate solids from fluid and wastewater and to be used in industrial and semi-industrial environments. Haft Industrial Group; Manufacturer of filter presses and other water treatment equipment that designs and manufactures this product with the latest world standards. In the following, we will provide a comprehensive guide to this product, including the introduction of pressure filter work, important points in designing, producing and manufacturing press filters and its price, and everything you need to know before buying filter presses.

What is a filter press?

Filter press is a device consisting of several plates and placed next to each other with a special filter cloth cover through which sewage passes and pressure on the plates, leads to the separation of solids in it. This device, due to the way it works and dehydrates industrial slurries, is able to produce a cake-like layer of solids in wastewater, which is used in different environments and for different reasons.

In the structure of the filter press system, there are several plates with a filter press cloth cover, which are compressed with the help of hand or hydraulic force, and high-efficiency separation operations are performed by applying pressure to the wastewater. In filter presses where the plates are compressed with the help of hydraulic force, the necessary force for their compression is provided by the hydraulic jack. Hydraulic jacks have different sizes and dimensions depending on the number of plates and the size of the device. Compression filter components include chassis or body, filter plates, fittings, filter cloths, electric motors, hydraulic pumps, hydraulic valves, control panels, electrical panels, jacks and hydraulic systems.

Types of pressure filters

Pressure filter or press can be divided according to different factors, each of which has a specific feature. For example, this group of wastewater treatment systems can be divided into manual and hydraulic groups according to the force required to compress the plates.

Manual pressure filter

In the manual type, the plates are compressed by the operator, but this type of filter press has a small size and dimensions and is not used in large industrial environments.

Automatic filter press

This type of filter press is mostly used in large environments and mines and its most important feature is the automatic emptying of cakes. This type of pressure filter will greatly increase the speed of work and will be economically viable due to the lack of the need for a human operator to empty the cakes.

Hydraulic filter press

In the design and construction of the hydraulic press filter, hydraulic jacks with different power and sizes are used, which, after the sewage is placed in the device, puts pressure on the plates and compresses them. Finally, after the solid separation from the liquid is completed, the plates are placed in the previous position again and separated from each other. Hydraulic filter presses are widely used in industrial and large environments and increase the efficiency of the device by reducing human error.

In another category, the sewage filter press system can be divided into two types of membranes (variable volume) and chamber (fixed volume) according to the type of plates and the process of solid separation from the liquid in the device.

Membrane Press Filter (Variable Volume (

Membrane pressure filter or variable volume is one of the most common types of treatment systems and solid separation from wastewater, which is mostly used in large industrial environments. In this type of filter press, after the sewage and fluid enter the device and the plates are compressed, the excess pressure force is applied to the fluid for better separation with 90% efficiency.

Chamber Press Filter (Fixed Volume (

Another type of pressure filters are known as fixed volume or chamber, which is mostly used in food industry factories. In this type of filtration system, after pressing the plates, excess pressure does not enter the fluid and therefore are called constant volume.

How Filter press works

In short, the working procedure of the filter press can be described as follows:

Sewage or fluid enters the device through the inlet valves and completely fills the space between the plates.

After the space between the plates is completely filled, the hydraulic jet puts pressure on the moving plates and causes them to be compressed. When pressure is applied to the plates and fluid, the liquid separates and the solids dissolved in it accumulate on the plate due to contact with the filtration cloth.

The filtered liquid is drained from the outlet valve and transferred to the outside of the device.

After the solid separation process from the liquid is completed, the system plates, which are connected by resistant chains, are directed to the right and the layer accumulated on the filtration cloth, which is called a cake, is separated from the plates and emptied from the machine.

Press filter design

In designing the filter press, it is necessary to consider various factors, such as the material used in the production of its various parts. In the design of filter press, several main components and parts are considered, which are:

·        System plates, which are often made of polypropylene and are resistant to contact with chemicals in the wastewater and do not cause corrosion.

·        The fabric is placed on the plates which should have good resistance against rot, corrosion and tearing. For this reason, they are often made of cotton, linen and polyamide.

·        Highly durable chassis for stacking the plates together

·        Pump to enter sewage and fluid into the device and remove them after treatment

·        Hydraulic jack to compress the plates and open them after finishing the filtration process

·        Fabric plate washing system periodically

·        Cake drain system and transfer it out of the machine

In addition to the proper selection of parts and components of the device, it is necessary to determine the dimensions and size of the device according to the amount of wastewater entering the device and the type of organic matter in them. There are many standards for the design of each part of this machine, the observance of which ultimately leads to the production of the best type of filter press systems with high efficiency and good service life.

Making filter presses

Haft Industrial Group, as one of the most experienced design and production teams and manufacturers of water and wastewater treatment equipment, has included the production of filter press systems in its activities. To date, this collection has succeeded in producing and manufacturing filter presses for domestic and foreign industrial and semi-industrial environments and designs each product according to the required features in their place of use. For information about the features of Filter press systems produced by this collection, you can contact the experts of Haft Industrial Group. The experts of this collection, who are all professional and experienced engineers in this field, are ready to provide advice and guidance and provide information about the price of filter presses and other required information before purchasing filter presses.

Price of filter press

The price of the press, like other equipments in the field of water and wastewater treatment, is determined according to various factors. These include the size and dimensions of the device, the number of plates, the type and model of the device (membranes, chamber, manual or hydraulic), the material used in the manufacture of various parts and so on. To inquire about the price of the filter press, all you have to do is contact the Haft Industrial Group through the communication channels mentioned at the bottom of the page.

Application of Filter press

Due to the very high efficiency of pressure filter systems and their cost-effectiveness compared to wastewater treatment systems with activated sludge, in most industries, filter press is used for filtration. Applications of this system include the following:

·        Industrial wastewater treatment

·        Separation of solids from liquids in food factories

·        Wastewater treatment of textile and dyeing factories and slaughterhouses

·        Wastewater treatment of drug factories

·        Petrochemical industry and chemical production

·        Wastewater treatment of ceramic and mineral factories

·        Separation of sludge from water in the treatment process

·        Used in power generation industries

To get information about the features of each of the filter presses, the price of filter presses and other water and wastewater treatment equipment of Haft Industrial Group, you can contact this collection through the following communication channels.

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Asayesh Afza Imen Company started its activity in the 70s with the aim of providing engineering consulting services in the construction and operation of water and wastewater treatment systems. This group operates by taking possession of the world’s technical knowledge and relying on new engineering technologies in the field of design, construction, installation and commissioning of water (industrial, domestic, swimming pool) and sewage systems.

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