Automatic Membrane Filter Press PLC Control

Membrane(Diaphragm) filter press is the type of filter press that half or all the filter plates are membrane(diaphragm) filter plates, after the initial filling completed, high pressure air or water will be pumped into the middle of membrane/diaphragm plates which cause the membrane to expand and push toward the filter cake for more filtration of remaining water. Membrane Filter Press can minimize cake remaining water content while making them easier to release from the plates. these are specifically for those areas that have higher demands on remaining water content or need to perform further thermal drying on the filter cakes.

Filter Press Overview:

Filter press is a batch operation, fixed volume piece of equipment ranging from 0.1m³  -20m³  that separates liquids and solids using pressure filtration. Slurry is pumped into the filter press and dewatered under pressure. A filter press can be used for process, water/liquid and wastewater treatment in a variety of different industries and applications, such as mining, metallurgy, petrol, chemical, medical, dyeing, paper, food, alcohol, textile production, etc..

Frame:                The steel frame acts as a clamping device for the filter plates.

Filter Plates:      A filter cake forms in the chambers between filter plates.

Filter Cloth:       A cloth filter that is attached to both sides of a filter plate. Solids build up on cloth to form a filter                              cake, separating liquids from solids.

Available options according to:

Closing mode:              manual, gear drive, hydraulic;

filter plate structure:    recessed plate, plate &frame, diaphragm squeeze (membrane) plate;

filter plate material:      PP, rubber, cast iron, stainless steel;

Filter Plate size(mm):  320, 450, 630, 800,1000, 1250, 1500,2000

Working principle of China Automatic Filter Press:

1. Feeding:  Slurry is pumped into the filter press. The solids are distributed evenly on the filter cloths during the feed (fill) cycle.


2. Filtration: Solids begin to build on the filter cloth, trapping the ensuing particles and building a filter cake. The filter cake acts as a depth filter for solid/liquid separation. Filtrate exits the plates through the corner ports into the manifold.


3. Filtration completed: When the correct valves in the manifold are open, the filtrate exits the press through the filtrate outlet. As the filter press feed pump builds pressure, the solids build within the chambers until they are completely full of filter cake.


4. Membrane Squeezing: Once the chambers are full, the fill cycle is over, high pressure water or compressed air will start fill in between membranes of filter plates, pushing the membrane toward the filter cakes, squeezing the filter cakes to remove any residue water.


5. Presssure relief:  when squeezing is over, high pressure water(compressed air) is released from between the membranes.


6. Cake discharge: after pressure relived, the filter press is ready to discharge cakes.

(* Note: 4, 5 is only for membrane filter press)

Membrane Filter Press Models & Technical Data

A Typical Layout Plan: