1、 Working principle
1. Plate and frame sludge dewatering machine: In a closed state, the sludge pumped in by a high-pressure pump is compressed by the plate and frame, and the water inside the sludge is discharged through the filter cloth to achieve the purpose of dewatering.
2. Belt type sludge dewatering machine: The sludge layer is carried by two tensioned filter belts on top and bottom, and passes through a series of regularly arranged roller drums in an S-shape. By relying on the tension of the filter belt itself, it forms a pressing and shearing force on the sludge layer, squeezing out the capillary water in the sludge layer and achieving sludge dewatering.
3. Centrifugal sludge dewatering machine: composed of a transfer and a screw conveyor with a hollow shaft. The sludge is fed into the rotary drum by the hollow shaft, and under the centrifugal force generated by high-speed rotation, it is immediately thrown into the rotary drum chamber. Due to different densities, solid-liquid separation occurs. Under the push of the screw conveyor, the sludge is transported to the conical end of the drum and continuously discharged from the outlet; The liquid in the liquid ring layer is continuously 'overflowed' from the weir and discharged outside the drum by gravity.
4. Stacked sludge dewatering machine: a filtering body formed by the stacking of fixed rings and moving rings, with a spiral shaft passing through them. Through gravity concentration and the internal pressure formed by the back pressure plate during the propulsion process, the sludge is fully dehydrated. The filtrate is discharged from the filter gap formed by the fixed ring and the movable ring, and the sludge cake is discharged from the end of the dehydration section.

2、 Workflow
1. The sludge in the sludge tank is transported to the measuring tank through the sludge conveying pump. The sludge inlet is adjusted by adjusting the liquid level in the measuring tank through the regulating pipe, and excess sludge is returned to the sludge tank through the reflux pipe.
2. Sludge and flocculant are thoroughly mixed in the flocculation mixing tank using a mixer to form alum flowers, with an ideal diameter of around 5mm.
3. Alum flowers undergo gravity concentration in the concentration section, and a large amount of filtrate is discharged from the filter slot in the concentration section.
4. The concentrated sludge continues to move forward in the direction of the spiral axis rotation, and is fully dehydrated under the internal pressure formed by the back pressure plate.
5. The dehydrated mud cake is discharged from the gap formed between the back pressure plate and the spiral body. The sludge treatment capacity and moisture content of the sludge cake can be adjusted by adjusting the rotation speed of the spiral shaft and the clearance of the back pressure plate.

3、 Application of sand making sludge dewatering equipment
1. Industrial wastewater coagulation sedimentation sludge
2. Excess activated sludge from industrial wastewater
3. Excess sludge from urban sewage treatment
4. Community sewage treatment sludge
5. Adding chemicals to the water purification plant to aggregate sludge
6. Water and fertilizer treatment of residual sludge
7. Solid liquid separation during factory manufacturing process