Membrane Filter Press

Membrane Filter Press

A membrane filter press is a filter press that uses a membrane plate in combination with an ordinary filter plate. It uses additional pressure for secondary pressing to enhance the filtration and dehydration process, making it more efficient and effective in separating solids from liquids. The membrane filter chamber is formed by membrane filter plates and chamber filter plates; the feeding pump feeds the sludge into the chamber, and through the filtration of filter cloth, the solids and filtrate are separated. When the solids form the filter cake, then blow the air into the membrane to further dry the filter cake. Diaphragm filter presses offer great advantages in reducing moisture content and improving the overall filtration process.

The membrane filter press is specially designed for viscous and glutinous material and has higher requirements for moisture.

The core of the membrane filter press is membrane technology, an innovative method of filtration using diaphragm plates. The plates are integrated with a flexible membrane, usually made of high-quality polypropylene(PP), that can be inflated at the end of the filtration cycle. The expansion of the membrane exerts additional pressure on the filter cake, causing a secondary press to dewater the solids and make the filter cake dry more.

Diaphragm Filter Press Composition

Membrane Plates: These are flexible plates made typically from polypropylene(PP) with an embedded elastomeric membrane. They can be inflated with air or water after the initial filtration phase.

Ordinary plates: Placed alternately with membrane plates to form filter chambers.

Filter Cloths: These are placed between each plate, acting as a filter media to separate solids from liquids during the filtration process.

Other elements are the same as the common filter press: Control Panel(HMI), Hydraulic Cylinder and Hydraulic station, Beam, and Drip tray.

How to Reduce Filter Cake Moisture with Membrane Filter Press

The diaphragm filter press consists of a diaphragm plate and a standard plate arranged alternately.

For the initial filtration cycle, sludge or slurry is pumped into the chamber, and the solids are collected on the filter cloth to form a filter cake. Inflation of the membrane: After the initial filtration cycle is completed, the membranes in the filter plates will be inflated by air or high-pressure water. This expansion exerts additional pressure on the filter cake, further compacting the filter cake and squeezing out residual moisture. Membrane squeezing and reducing moisture: Applying this pressure increases the dry solids concentration of the filter cake, effectively reducing its moisture content. This process makes the filter cake drier.

Membrane filter Press Working Principle:

Membrane Filter Press Plates have a chamber below the drainage surface that can be inflated. The common method used is water pressure, which is generated by pumping into the squeeze cavity to inflate the face of the plate against the filter cake. Membrane Plates are used to reduce the cake’s moisture content and shorten the filtration cycle time.

During the initial phase of the filtration cycle, so-called “fill and filtration” the process is similar to the chamber Filter Press. After reaching a predefined pressure, usually around 5 – 7 bar, depending on the sludge characteristics, sludge feeding is stopped & the rubber membranes are inflated, using either water or air as a squeeze medium. The cake is hereby compressed and dewatered further. Then, the squeeze medium is relieved & the cake is discharged.

For those with a filter cake washing system, the filter cake will be cleaned before unloading the filter cake. This design can pass clean water through the washing port of the filter plate to clean the filter cake to ensure the removal of any remaining impurities. Compressed air can also be passed through the washing port to dry the filter cake. This is particularly advantageous in applications where filter cake purity is critical, such as in the pharmaceutical and food industries. The washing process of membrane filter presses can be adapted to specific requirements to ensure optimal results.

Membrane filter Press VS Common Filter Press:

Membrane type can get dryer filter cakes, lower moisture content than common filter press, and it can greatly reduce the filtration time.

The efficiency of a membrane filter press is most evident in its filtration cycle time. Due to the additional pressure exerted by the membrane, the solids dehydration process is significantly accelerated. This greatly reduces cycle time and improves filtration efficiency.

Parameters of 200 m2 diaphragm filter press:

• Filtering area:200 m2
• Model: XMZ 200/1250-30U
• Chamber volume:3015L
• Dimensions:8.6x2x1.65 m
• Capacity:3 tons per cycle
• Input moisture:99%
• Outlet moisture: less than 30%
• Weight:15 tons

Model: Automatic pulling plates membrane filter press XMGZ200/1250-30U.

Applications: chemical, pharmaceutical, food, mining, water treatment, electroplating, metallurgy, dye, textile industry.

Membrane Filter Press Filter Cakes

Membrane filter press Parameters: