How does the stacked screw solid-liquid separator work

Stacked screw solid-liquid separator is a new type of solid-liquid separation equipment, whose working principle is mainly based on the principles of spiral extrusion and filtration. The following is a detailed explanation of the operation of the stacked screw solid-liquid separator:

Working principle

• Spiral squeezing: The core component of the screw stacking machine is the spiral conveyor, which separates solid particles from the solid-liquid mixture through rotational motion. Inside the screw stacking machine, the spiral blades are arranged at a certain distance and angle to form multiple spiral channels. After the mixture enters the equipment, the rotation of the spiral blades drives the solid particles to move upward, while the liquid flows out through the gaps between the blades, achieving solid-liquid separation.
• Dynamic and static ring filtration: The main body of the screw stacking machine consists of multiple fixed rings and moving rings, with a spiral shaft passing through to form a filtering device. Under the push of the spiral shaft, the sludge is filtered through the dynamic and static rings to further achieve solid-liquid separation. Meanwhile, the squeezing effect of the spiral shaft can further reduce the moisture content of the mud cake.

working process

• The working process of the stacked screw solid-liquid separator can be divided into three parts: concentration, dehydration, and self-cleaning:
• Concentration: In the concentration section, when the screw drives the shaft to rotate, the multiple fixed and movable laminations located on the outer periphery of the shaft move relative to each other. Under the action of gravity, water is filtered out from the gaps between the relatively moving laminations, achieving rapid concentration.
• Dehydration: The concentrated sludge moves forward continuously with the rotation of the screw shaft. Along the direction of the mud cake outlet, the pitch of the spiral shaft gradually decreases, the gap between rings also gradually decreases, and the volume of the spiral cavity continues to shrink. Under the action of the back pressure plate at the outlet, the internal pressure gradually increases. Under the continuous operation of the spiral drive shaft, the water in the sludge is squeezed and discharged, and the solid content of the filter cake continues to increase, ultimately achieving continuous dewatering of the sludge.
• Self cleaning: The rotation of the spiral shaft drives the moving ring to continuously rotate, and the equipment relies on the movement between the fixed ring and the moving ring to achieve a continuous self-cleaning process, thereby avoiding the common problem of blockage in traditional dehydrators.

Product advantages

• Efficient separation: The spiral blades and dynamic and static rings of the screw stacking machine can improve separation efficiency and reduce the residue of solid particles.
• Low energy consumption: Compared with traditional centrifugal separation or filtration equipment, the screw stacking machine consumes less energy during operation.
• Wide applicability: The screw stacking machine can be widely used for sludge dewatering in various industries such as municipal sewage, food, beverage, slaughter and breeding, printing and dyeing, petrochemicals, papermaking, leather, pharmaceuticals, etc.
• Environmentally friendly and odorless: The screw stacking machine has no vibration and low noise during operation, and the laminations have self-cleaning function, which will not cause blockage problems. Only a small amount of water is needed for flushing, and there is no secondary water pollution. Meanwhile, the sludge operates at a slow speed, preventing the diffusion of odors and creating a favorable operating environment.
• Space saving: The screw stacking machine is designed to be compact and has a small size, and it also has sludge concentration function. It directly processes aerobic sludge in the aeration tank without the need for concentration and storage units, reducing the overall footprint and construction cost of sewage treatment facilities.

In summary, the stacked screw solid-liquid separator achieves solid-liquid separation through the principles of spiral extrusion and filtration, and has advantages such as efficient separation, low energy consumption, wide applicability, environmental friendliness, odorlessness, and space saving.