Four dewatering stages of belt filter press system

   Chemical pretreatment dehydration stage
In order to improve the dewaterability of the sludge, improve the properties of the filter cake, and increase the permeability of the material, the sludge needs to be chemically treated. This machine uses a unique “water flocculation granulation mixer” device to achieve chemical dosing and flocculation This method not only has good flocculation effect, but also saves a lot of chemicals, has low operating cost and obvious economic benefits.
Gravity concentration dehydration stage

The sludge is evenly sent into the mesh belt through the cloth hopper. The sludge moves forward with the filter belt. The free water flows into the water receiving tank through the filter belt under its own weight. Gravity dehydration can also be said to be a highly concentrated section. The main function is to remove the sludge. The free water in the sludge reduces the fluidity of the sludge and prepares for further extrusion.
Wedge zone pre-pressure dehydration stage

The fluidity of the sludge after gravity dehydration is almost completely lost. As the filter belt of the belt filter press moves forward, the distance between the upper and lower filter belts gradually decreases, and the material begins to receive a slight pressure, and as the filter belt runs, the pressure gradually increases The role of the wedge-shaped zone is to extend the gravity dehydration time, increase the extrusion stability of the flocs, and prepare for entering the pressure zone.

Squeeze roll high pressure dehydration stage

When the material leaves the wedge-shaped zone, it enters the pressure zone. The material is squeezed in this zone. The pressure along the running direction of the filter belt increases as the diameter of the squeeze roll decreases. At this time, the filter cake is basically formed, and the water content of the filter cake can be reduced to a lower level after high pressure in the high pressure area at the end of the pressure. After the above-mentioned dehydration treatment, the material forms a filter cake and is discharged, scraped by a scraper, and separated from the upper and lower filter belts. After the high-pressure washing water removes the trace material between the filter mesh holes, it continues to enter the next dehydration cycle.

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