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2Gravity concentration and dehydration section

The sludge is evenly fed into the mesh belt through the material hopper, and 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 dewatering, also known as the highly concentrated section, mainly removes the free water from the sludge, reducing its fluidity and preparing for further squeezing.

3Wedge zone pre pressure dehydration section

After gravity dewatering, the fluidity of the sludge 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 experience slight pressure. As the filter belt runs, the pressure gradually increases. The function of the wedge-shaped zone is to extend the gravity dewatering time, increase the extrusion stability of the flocs, and prepare for entering the pressure zone.

4High pressure dehydration section of squeezing roller

When the material leaves the wedge-shaped zone, it enters the pressure zone where it is compressed. The pressure along the direction of the filter belt increases with the decrease of the diameter of the compression roller, causing the material to shrink in volume. The free water in the gaps inside the material is squeezed out, and at this point, a filter cake is basically formed. Continuing forward to the high-pressure zone at the end of the pressure, the water content of the filter cake can be reduced to the lowest after passing through high pressure.