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Press filter

Product Introduction:Belt press filter, also known as belt filter, is wound by two endless filter belts on a series of rollers of different order and size, using the squeeze and shear between the filter belts. A filtration device that removes moisture from the slurry.

Application:Filters are mainly used in papermaking, printing and dyeing, pharmaceutical, mining, steel, coal, leather and other industries, especially in urban sewage treatment and industrial sludge dewatering.

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Product Features

The press filter can be formed into many different models due to the different arrangement and combination of the press rolls. The utility model has the advantages of simple structure, high dehydration efficiency, large processing capacity, low energy consumption, low noise, high degree of automation, continuous operation and easy maintenance, and the cost and operation cost are reduced by more than 30% compared with the plate and frame filter press, thereby becoming The preferred equipment for urban sewage treatment.

Working Principle


The working process of the press filter is roughly divided into 4 stages:
The first stage: the pre-processing stage. The solids content of the original slurry is generally very low, and the slurry concentration must be increased by gravity or other means to reduce the processing cost. The commonly used pretreatment method is: mixing the concentrated sludge with the high-molecular flocculant, the material is agglomerated by the flocculant, and the fine particles are aggregated and precipitated initially, which is a preparation condition for the sludge dewatering on the sludge.
The second stage: the gravity dehydration stage. The flocculated pretreated sludge is added to the filter belt, and under the action of gravity, the free water outside the floc is filtered through the filter belt to reduce the water content of the sludge.
The third stage: the wedge preload dehydration stage. After the gravity dewatering, the sludge begins to enter the wedge-shaped pressing section, and the gap of the filter belt is gradually reduced, and the extrusion and shearing action is applied to the sludge to dehydrate the sludge again. After this stage, the sludge fluidity is almost completely lost, thus ensuring that under normal conditions, the sludge will not be squeezed out in the press dewatering section.
The fourth stage: the press dehydration stage. The sludge is repeatedly squeezed and sheared by a carefully designed press roll system to remove a large amount of capillary water, so that the sludge moisture is gradually reduced to form a sludge filter cake. At the separation of the filter belt, the filter cake is discharged. The scraper is scraped off. After the unloading, the filter cloth is washed and enters the next cycle.

Technology Data

Press filter
Model DY750 DY1000 DY1500 DY2000 DY2500 DY3000
Parameter index
machine Length mm 4250 4250 4250 4250 4250 4250
Width mm 1630 1880 2380 2920 3420 3920
Height mm 2100 2100 2100 2100 2100 2100
Host drive power kw 1.1 1.1 1.5 2.2 2.2 2.2
Filter belt width mm 750 1000 1500 2000 2500 3000
Flter belt tension KN/m 0~8 0~8 0~8 0~8 0~8 0~8
Filter belter line velocity m/min 1~9
Processing capacity （m3/h） 3~7 6~11 8~16 12~23 16~28 19~33
Air pressure Mpa 0.2 0.2 0.3 0.4 0.5 0.6
Water pressure while cleaning the belt Mpa 0.3~0.5 0.3~0.5 0.3~0.5 0.3~0.5 0.3~0.5 0.3~0.5
Water consumption while cleaning t/h 6.5 6.5 10 13 16 20
t/t（干泥） 28~32 28~32 28~32 28~32 28~32 28~32
Flocculant used kg/t(干泥) 0.5~2
Water content of filter cake % 68~80
Weight kg 2900 3500 4500 5500 6500 7500

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