Membrane Filter Press
The Solid-Liquid Separation Technology of the Membrane Filter Press by Panama offers Membrane Filter Press with unique advantages like more drier cake, better quality of product, reduction in filtration - washing & discharge time. Membrane technology also Increased productivity in a positive manner. It has proven to be quite useful in many of the applications. This modern filtration system is specifically suitable in treating dyes, pigments, edible oils, Effluent Treatment Plant (ETP), Sewage Treatment Plant (STP) where more dry cake is required.
Membrane plates that are made out of Polypropylene lining are used in the unique design. These membrane plates are combined with recessed companion plates to form chambers through which slurry is feed under pressure (usually between 7 and 10 bars). Inflating (Squeezing) these membranes with pressurized water or air. By doing so additional pressure (Squeezing) reduces the moisture of the wet cake. Thereby extracting more filtrate making for a final product that more dry. The high pressure polypropylene (PP) membrane plates are the recent innovations offering higher performance and longevity.
Key Features
- Membrane Method: The flexible nature of the membrane permits squeezing once filtering has been done therefore greatly reducing cake moisture content.
- High Washing Efficiency : : In compare to conventional Filter Press Membrane Filter Plates are known for Homogeneous cake build-up (forming of even wet cake), due to uniform structure in the wet cake it’s required less washing fluid (Liquid).
- High Squeeze Pressure: This allows getting up to 16 bars ensuring more dried cake and reduced drying cost.
- Sturdy Construction: High elasticity along with resilience properties exhibited their performance over an extended period even under severe operating conditions.
- Energy Efficiently: Less energy consumption as well as reduced washing liquid use due to formation of more efficient cakes.
- Least Maintenance: Built for reliability with minimum maintenance required for them to perform continuously over time.
- Compressed air is no longer required for cake blowing which makes cycle time shorter.
- Remarkable higher solid contents in the filter cake.
- Squeezing Pressure up to 16 BARS.
- Available sizes up to 2 Mtrs X 2 Mtrs.
| Size | Filtration Area Mtr.² | Chamber Volume Liters | ||||||
|---|---|---|---|---|---|---|---|---|
| 25mm | 35mm | 40mm | 50mm | 25mm | 35mm | 40mm | 50mm | |
| 630mm | 0.56 | 0.58 | 0.6 | - | 6.30 | 8.10 | 9.00 | - |
| 800mm | 0.95 | 1.00 | 1.05 | - | 14.75 | 17.25 | 18.5 | - |
| 1000mm | 1.56 | 1.61 | 1.64 | - | 23.75 | 29.25 | 32 | - |
| 1200mm | 2.28 | 2.36 | 2.4 | - | 27.5 | 38.00 | 43 | - |
| 1500mm | 3.57 | 3.68 | 3.74 | - | 42.25 | 60.75 | 70 | - |
| 1.5 x 2.0 mtr | 4.3 | 4.65 | 5.0 | - | 67.00 | 89.00 | 100 | - |
| 2.0 x 2.0 mtr | 5.75 | 6.45 | 6.8 | - | 90.3 | 114.6 | 127 | - |
How It Works
- Feeding : At low tension, slurry is feed into the Filter Press to initiate filtration. The liquid passes through while solid particles are trapped by filter clothes and fill up chambers built with recessed and membrane plates.
- Cake Washing : trapped by filter clothes and fill up chambers built with recessed and membrane plates.Cake washing normally is used to remove impurities from a valuable solid products. Cake washing removes mother liquor, soluble components, and insoluble contaminants.
The process of washing a filter cake whilst within the filter press is often a requirement of the basic process where the Filter Cake is a product in such industries Like Pigment , dyestuffs, agricultural chemicals, pharmaceuticals, beverage processing etc. . Generally, there are two different ways of in-situ cake washing as described below:
Simple Wash : A simple wash is performed by passing the wash medium through the feed channel and out through the filtrate channels. In this the washing medium can follow the flow path of the original feed and therefore enter the cake in the centre and wash through the two partially formed filter cakes. This type of washing also allows the formed filter cake to hold the wash medium often forming a wetter cake. However, this can be dramatically improved by using membrane filter plates to squeeze the cake dry after the washing process has finished.
Thorough Wash : Thorough Wash The second method of washing the cake is termed ‘thorough’ and requires the plate pack to be designed to allow for the wash media to back wash through individual chambers. This process is achieved by alternating Pressure Plate and Wash plates though the filter pack. A Pressure Plate is designed with filtrate ports on one side of the plate only while the Wash Plate is designed with filtrate ports on the opposite side of the plate only. This design then allows for the cake wash media to be directed through either one or two filtrate ports on one side of the press. In this Process the wash water has entered the chamber behind the filter cloth the only route out is through the formed filter cake and out through the filtrate ports on the adjoining plate. The principle relies on the wash water entering one side of the press and leaving on the opposite side, but it is possible to reverse the flow after an initial period to give an even a more intense wash. With this type of wash, it is also possible to allow the cake to form in a dryer condition as we do not require a wet centre to ensure the wash water cover all the cake area to obtain the best cake solids achievable.
CAKE WASHING SEQUENCE & CYCLE:
1) FILL FULL VOLUME TO ALL CHAMBERS AND CLOSE FEED VALVE
2) START CAKE WASH ALWAYS WASH FROM WASH PLATE IF POSSIBLE
3) CARRY OUT WASH NORMALLY 2-3 TIMES OF FILTER PRESS VOLUME
4) WASH INLET PRESSURE SHOULD BE 1 BAR HIGHER THAN FEED PRESSURE
5) ALWAYS WASH DIAGONAL AND UPWARDS
- Membrane Squeezing :In order to exert more moisture on the filter cake, pressurized water or air is pumped into the membranes after filtration & washing stage. Therefore, the moisture content of a cake is considerably reduced during squeezing thus often making it much thinner than chamber depth that is necessary for optimum filtering outcomes.
- Cake Discharge : Membranes deflate after completion of squeezing process leading to removal of the filter cake from the press. Thus, this final product has a much lower moisture content resulting in a drier cake which can undergo further processing or be disposed.
- System Maintenance : A number of regular checks are vital for optimal performance maintenance throughout their working life span like checking membrane plates for damages, ensuring equal feeding thereby eliminating differential pressures within chambers as well as ensuring proper handling of the squeeze media (ideally water due to its incompressibility and safety).
- Safety Reminder :The squeezing (squeeze) outlet valve must be open in all manner (filling, washing, airing). This outlet valve will be closed in squeeze cycle only
Precautions
- Proper Installation : Do not expose membrane filter plates directly to sunlight during installation so as not to deform them.
- Pressure Management : Maintain correct squeeze pressure and avoid overfilling chambers so as not to damage plates.
- Safety Considerations : Always prefer water as the squeezing medium due to its lower risk compared to compressed air. Regularly check for leaks and ensure that the squeeze medium is fully drained after each cycle
- Temperature Control : In order to prevent plate deformation and prolong the life of the membranes, it is important that one operates the membrane filter press at recommended temperatures.
- Proper Filling : Is requested to fill all chamber with filter cake evenly and completely.
- Any empty squeezing is prohibited (Chamber without wet cake).
The Membrane Filter Press from Panama provides innovative solutions that are highly reliable for industrial applications requiring high efficiency dewatering. With its advanced technology of membrane filters, solid construction and versatility of application, this machine is useful for optimizing filtration processes to improve quality of end products.
