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Plate Frame Membrane Filter Press Industrial Sludge Dewatering Process Equipment

Filter press sludge dewatering machine is a widely used equipment in industry, which can effectively separate solids from liquids. Filter press functionality is derived from high-pressure operation, which compacts the solid filter cake and minimizes moisture content. This core technology solves the solid-liquid separation problem in many industries and is an important part of industrial production.


The operation of the sludge dewatering filter press consists of several steps. First, the slurry (a mixture of solid and liquid) is delivered to the filter press under high pressure. Then, the corresponding filter media (such as filter cloth) will trap the solids in the slurry and allow the liquid to pass through. The separated liquid, also called filtrate, is discharged through a system of pipes. In this process, the high pressure not only effectively separates the solid, but also compreses the moisture of the filter cake and improves the drying degree of the filter cake.

    Project Introduction

    Application industries of filter press machine:
    Filter presses machine have become essential equipment in various industries due to their ingenious design and functionality. Filter presses have a variety of application fields and play a vital role in chemical, mining, food and beverage, pharmaceutical, environmental protection and other industries.

    In the chemical industry, filter presses are used to process large amounts of chemical waste and efficiently extract reusable resources. The solid-liquid separation capabilities of a filter press make it ideal for handling chemical waste.

    In the mining and metallurgical industries, filter presses are used to effectively separate solids from ore liquors during the extraction and processing of ore. This helps reduce the environmental impact of mining operations and allows valuable resources to be recovered.

    The food and beverage industry also relies heavily on filter presses to separate pure liquid products from raw materials during production. This ensures the production of high quality food and beverage products.

    In the pharmaceutical industry, the use of filter presses is critical for cleaning and clarifying pharmaceutical solutions to ensure that the final product meets strict quality standards.

    In addition, in the field of environmental protection, filter presses play a vital role in treating industrial wastewater and domestic sewage. By effectively reducing water pollution levels, filter presses help improve environmental sustainability.

    The working principle of the filter press and its areas of application make it a powerful tool in industrial production. Its ability to increase work efficiency, improve product quality and efficiently utilize resources makes it an indispensable piece of equipment in many industries.

    In summary, the widespread use of filter presses in various industries highlights their importance in solid-liquid separation processes. By gaining an in-depth understanding of how filter presses work and their applications, industries can make the most of this equipment to meet their specific solid-liquid separation needs. The versatility of filter presses makes them an indispensable asset in modern industrial processes, especially in the field of sludge treatment and dewatering.

    Structure of filter press equipment:
    Filter press machine is a kind of commonly used filtration equipment, widely used in various industrial fields, such as sewage treatment, chemical, pharmaceutical, food and other industries. Its main function is to filter the material and effectively separate the liquid and solid, so as to achieve the purpose of purification, separation and concentration. The structure of filter press equipment is mainly composed of the following parts: 

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    1. The filter media. Filter media such as filter cloth or mesh play a vital role in filtration and separation. It allows liquids to pass through while retaining solid particles, thus facilitating the separation process. The choice of filter media depends on the application area and specific filtration needs.

    2. The filter plate. The filter plate is the core component of the equipment and consists of multiple filter plates. By using a hydraulic system, the plates are pressurized to create an enclosed filter space. This allows the material to penetrate into the filter media under pressure, allowing for effective liquid filtration.

    3. The hydraulic system serves as the power source for the filter press. It consists of hydraulic pump, oil cylinder, hydraulic valve, etc. The hydraulic pump pumps oil into the oil cylinder, and the piston rod in the oil cylinder pushes the filter plate to pressurize the material to filter and separate the material.

    4. The control system is the central mechanism for regulating and controlling the filter press. It consists of various control components and sensors, including electric control cabinet, operation panel, pressure sensor, etc. The control system plays a vital role in monitoring and managing the hydraulic system to ensure efficient operation of the filter press.

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    5. The frame of the filter press serves as the support structure for the entire equipment. It is usually constructed using various steel profiles and plates to provide stability and rigidity to the filter press. The durability and sturdiness of the rack directly affects the performance and service life of the equipment.

    6. The cleaning device is an important part of the filter press and is mainly used to clean the filter material and filter plates. The cleaning device usually includes cleaning nozzles, cleaning pumps and cleaning tanks to ensure the correct maintenance and service life of the filter press.

    7. Mobile device: mobile device is one of the auxiliary devices of filter press, which is mainly used to move the filter plate and filter medium. Mobile devices are usually composed of mobile platforms, mobile frames, etc., which can be selected according to different application fields and filtration requirements.

    The above is a brief introduction to the structure of the filter press equipment. There may be some differences in the structure of different types of filter press equipment, but they are generally composed of the above parts. The structural composition of the filter press equipment is conducive to better use and maintenance of the filter press equipment, improve the efficiency of the equipment and extend the service life of the equipment.

    Overall, the structural design of filter press equipment is to optimize the filtration and separation process. Each component plays a critical role in ensuring the efficiency and performance of your equipment. Whether it is a plate filter press, plate filter press or membrane filter press, the proper operation of all components is crucial for effective sludge treatment and dewatering.

    Working principle of plate and frame filter press machine:
    The working process of plate and frame filter press mainly includes filter plate closure, feeding filter, diaphragm extrusion, center back blowing, pulling plate unloading.

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    1) Close the filter press and press the filter plate. The low pressure oil pump starts to load, and the filter plate starts to close. When the pressure is greater than 5 MPa, the low pressure oil pump stops, and the high pressure oil pump starts. When the pressure reaches the set value (the current set value is 30 ~ 34 MPa), the high pressure oil pump stops working, and the closure of the filter press is completed.

    2) After the closing step of feeding filter is completed, the feeding pump shall start feeding according to the set procedure. The material enters the plate and frame filter press, and the feed pressure makes the filtrate pass through the filter cloth, and the solid is intercepted by the filter cloth to form the filter cake. With the progress of filtration, the filtration pressure continues to increase, the filter chamber is gradually filled with the filter cake, and the feed pressure continues to increase, and remains unchanged for a long time. With the increase of feeding time, the feeding flow decreased to 8 m3/min, and the feeding pressure reached 0. When about 7MPa, the feeding pump stops working. During the feeding period, the pressure of the main cylinder changes, and the high-pressure oil pump will work intermittently to meet the set pressure value.

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    3) The set value of feeding pressure and extrusion force for expansion and extrusion of diaphragm plate is 0.7MPa and 1.3MPa respectively. The extrusion pump starts to work, and the material is forcefully squeezed and dehydrated with the diaphragm tension. The extrusion process is completed when the set pressure is reached. The extruded water is piped back into the extruded bucket. Filtrate water is discharged through the filter cloth, solid substances are blocked by the filter cloth, and the solid content of sludge is further improved.

    4) After the center back blowing extrusion pressure reaches the set value, start the center back blowing according to the set program. Generally, the set value of the center back blowing pressure is 0.5MPa, which can improve the solid filter of the filter cake, effectively remove the residue of the feeding pipe, avoid the blockage of the feeding pipe, and improve the service life of the filter cloth.

    5) Open the high pressure oil pump of the filter press to start, the reversing valve acts, the oil in the main cylinder begins to return to the oil tank, and the pressure begins to be relieved. When the pressure drops to about 18 MPa, the high pressure oil pump stops, the low pressure oil pump starts to work, the pressure quickly decreases to about 0.4 MPa, the filter press is opened, and returns to the starting point.

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    6) Pull plate unloading high pressure oil pump starts, pull the claw forward, when the pressure of pull the claw card filter plate reaches about 1.5MPa, pull the claw to start backward. When the pressure of pulling claw reaches 2 ~ 3 MPa, pulling claw begins to move forward again, according to this law of repeated action. After pulling the claw car to pull apart the filter plate, the filter cake usually falls off by itself under the action of gravity, and the situation that the filter cake sticks to the filter cloth with large viscosity cannot be excluded.

    The influencing factors of filter press:

    1. Pressure factor
    The main factor affecting the filtration effect of the filter press is the control of pressure. As we all know, the main working principle of the filter press is to realize the filtration function through the control and adjustment of pressure, so the quality of the pressure system is directly related to the quality of the filtration effect.

    2. Speed factor
    Another factor affecting the performance of the filter press is the speed of filtration. Now many manufacturers are blindly pursuing the speed of product filtration and ignoring the essence of filtration. In fact, according to the concentration of liquid and resistance and other different factors to consider and appropriate distribution of the use of the machine speed, which is before the purchase of designers need to design their own.

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    3. Filtration area factor
    The factors that affect the filtration effect of the filter press are the filter area. As we all know, the larger the area of the filter, the faster the flow of the object through the filter, the more the residue will be taken away from it, and the worse the filtration effect will be. Of course, the same density specification is not as large as the small area of the filter. However, this comparison method is not applicable to products with different mesh areas.

    Sludge Treatment: Advantages of Filter Presses machine:
    The filter press is an essential piece of equipment in the sludge treatment industry. They are used to separate solids and liquids from sludge and come in many types, including plate filter presses, plate and frame filter presses, and membrane filter presses. These machines are essential for sludge dewatering and are equipped with advanced features to optimize the filtration process. Here are some of the advantages of filter presses:

    1. Increase filtering speed:
    The filter press adopts convex column point filter plate to increase the effective water conduction area and achieve faster filtration speed. This design also allows the filtrate to flow in any direction, shortening the filtration process.

    2. Multifunctional and convenient design:
    The feed port is located in the middle of the filter plate. It has large pore size, small resistance and even force distribution, making it suitable for various challenging materials. In addition, the user-friendly design allows easy installation and replacement of filter cloth, improving convenience and durability.

    3. Durable and chemical-resistant materials:
    Filter presses are constructed from reinforced polypropylene material, known for its stability, corrosion resistance and chemical inertness. This ensures that the equipment can withstand harsh sludge treatment conditions and reduces labor intensity during operation.

    4. Efficient and reliable operation:
    Reasonable frame design and joint action mechanism, combined with hydraulic pressure and electrical appliances, reduce the labor intensity during machine operation. Automatic pressure maintaining and electric contact pressure gauge, stable and reliable performance.

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    5. Enhance dehydration ability:
    The use of membrane filter plates in filter presses allows the filter cake to be completely dehydrated. This feature is particularly beneficial for materials with high moisture content and improves production efficiency.

    6. Time-saving and automated options:
    Some filter presses can be automated, eliminating the need for manual plate pulling and unloading, thus saving time and labor.

    In summary, the advantages of filter presses, including increased filtration speed, versatile design, durability, efficient operation, improved dewatering capabilities and automation options, make them an integral part of sludge handling and dewatering operations. These advanced features ensure the best performance and productivity in the industry.

    How to deal with the causes of grouting in filter presses:
    There may be several reasons why a filter press may grout. Understanding the possible causes and remedies is important to ensure your equipment operates smoothly and efficiently.

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    Insufficient compression force of the oil cylinder will cause grouting in the filter press. This problem can be solved by adjusting the pressure or using a boost regulator to ensure adequate pressure.

    Another possible cause of grouting is excessive feed pump pressure. In this case, a pressure reducing valve can be used to adjust the pressure to normal levels.

    It is also important to check whether the filter cloth is improperly installed or damaged. The filter cloth needs to be cleaned and replaced in time to ensure smoothness and no damage.

    The high viscosity of the filter material can also lead to reduced filtration efficiency or spraying. It is crucial to promptly identify the cause and take appropriate measures to improve filtration efficiency.

    Problems with the compression mechanism, such as insufficient or uneven compression strength, can also cause grout in a filter press. This problem needs to be solved by adjusting the compression mechanism and intensity.

    Additionally, an unbalanced linen roller can cause grout. It is crucial to adjust the installation position of the linen roller to ensure balance and maintain good filtration effect.

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    Impurities on the sealing surface of the filter plate and damage to the sealing surface should be dealt with promptly, the sealing surface should be thoroughly cleaned, and the filter cloth should be replaced as needed.

    Hydraulic system issues, such as low oil levels or a damaged relief valve, can also cause grouting. Appropriate maintenance or repairs are required to resolve these problems.

    It is crucial to regularly check the status of all components of your filter press. Necessary maintenance and adjustments should be carried out in a timely manner according to the actual situation to ensure the normal operation and safe use of the equipment. By adopting these methods, the causes of grouting in the filter press can be effectively dealt with and the efficient and reliable operation of the equipment can be ensured.

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