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The working principle of the belt filter press and the system dehydration process

After the concentrated sludge is mixed with a certain concentration of flocculant in the sludge agitator, the small solid particles in the sludge condense into a larger flocculent mass and separate the free water and flocculate The mud is transported to the gravity dehydration zone of the filter belt, under the action of gravity free water is separated to form a non-flow of the sludge, and then clamped between the upper and lower two mesh belt, through the wedge preload area, low pressure area And high pressure zone from small to large squeezing force, shear force, the gradual squeeze the sludge to achieve the maximum degree of mud, water separation, and finally the formation of sludge cake discharge.
1. Chemical pretreatment dehydration
In order to improve the sludge dewatering, improve the nature of the filter cake, increase the permeability of the material, the need for chemical treatment of the sludge, belt filter press using a unique "water flocculation granulation mixer" device to achieve chemical Drug flocculation effect, the method not only flocculation effect is good, but also save a lot of pharmaceuticals, low operating costs, economic benefits are obvious.
2. Gravity concentrated dehydration section
The sludge is fed into the mesh belt uniformly through the hopper, and the sludge is running with the belt filter filter. The free water flows into the receiver through the filter belt under the action of the deadweight. The gravity dehydration can also be said to be a high degree of concentration. Is to remove the free water in the sludge, so that the flow of sludge to reduce the preparation for further extrusion.
3. wedge area pre-pressure dehydration section
The flow of sludge after gravity dewatering is almost completely lost, with the filter belt running forward, the upper and lower filter belt spacing gradually reduced, the material began to be a slight pressure, and with the filter running, the pressure gradually increased, the role of wedge Is to extend the gravity dehydration time, increase the stability of the floc extrusion, to enter the pressure zone to prepare.
4. Press the high pressure dehydration section
The material from the wedge area into the pressure zone, the material in this area by squeezing, along the filter belt running pressure with the squeeze roller diameter decreases, the material is squeezed volume shrinkage, the gap within the material free water is squeezed out , At this time, the basic formation of filter cake, continue to move forward to the pressure of the high pressure area after the high pressure filter cake water content can be reduced to a minimum.
The material after the above stages of the dehydration treatment after the formation of cake discharge, scraping through the scraper, upper and lower filter belt separated, after high pressure flushing water to remove trace material between the mesh, continue to enter the next step dehydration cycle.

Characteristics of Sludge Treatment Equipment for Belt (Vacuum) Filter Press
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