Introduction to Stacked Snail Sludge Dehydrator
The stacked screw sludge dewatering machine belongs to the spiral press dewatering machine, which can reduce sedimentation tanks and sludge concentration tanks, and save the construction cost of sewage stations. The stacked screw sludge dewatering machine cleverly uses automatic updating filter cake filtration technology to replace traditional filter screen filtration. The self updating filter cake filtration technology ensures the continuous and stable separation effect of sludge and water in the dewatering machine. Through the strong squeezing force generated by the change of screw diameter and pitch, as well as the small gap between the moving ring and the fixed ring, the sludge is squeezed and dehydrated. It is a new type of solid-liquid separation equipment.

The working principle of the stacked screw sludge filter press is as follows: 1. Concentration: When the screw pushes the shaft to rotate, the multiple solid and active stacked sheets set on the periphery of the pushing shaft move relative to each other. Under the action of gravity, water is filtered out from the gaps between the relatively moving stacked sheets, achieving rapid concentration.
2. 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. With 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.
3. 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, thus cleverly avoiding the common problem of blockage in traditional dehydrators.
Construction principle of stacked screw sludge dewatering machine

The main body of the dehydrator is a filtering device formed by stacking a fixed ring and a moving ring, with a spiral shaft passing through them. The front section is the concentration section, and the rear section is the dehydration section.

The filter gap formed between the fixed ring and the moving ring, as well as the pitch of the spiral shaft, gradually decreases from the concentration section to the dehydration section.

The rotation of the spiral shaft not only drives the sludge to be transported from the concentration section to the dewatering section, but also continuously drives the moving ring to clean the filter gap and prevent blockage.

After gravity concentration in the thickening section, the sludge is transported to the dewatering section. As it moves forward, with the gradual reduction of the filter gap and pitch, as well as the blocking effect of the back pressure plate, a great internal pressure is generated, and the volume continuously decreases, achieving the goal of full dewatering.

Working process of stacked screw sludge dewatering machine

Process description

1. Determine the matching flocculant type and dosage ratio through flocculation test

Through the sludge transfer pump, the sludge is transported to the sludge transfer port

After adjusting the flow rate through the measuring tank, the sludge is transported to the flocculation mixing tank and thoroughly mixed by stirring

After being thoroughly stirred by a mixer to form larger alum flowers, they are sent into the main body of the stacked snail

5 alum flowers are subjected to gravity concentration in the concentration section, and a large amount of filtrate is discharged from the filter slot in the concentration section. The filtrate from the concentration section has a low solid content and is directly refluxed to the raw water tank.

The concentrated sludge is pushed forward along the spiral axis and fully dehydrated in the dewatering section under the action of various forces. The filtrate from the dehydration section has a high solid content and can be refluxed to the flocculation mixing tank for further dehydration.

The gap between the moving ring and the fixed ring of the dehydration section becomes narrower, and further pressure dehydration is carried out by adjusting the back pressure plate located at the discharge outlet, and finally the mud cake is discharged.

Product characteristics of the stacked screw sludge dewatering machine

1. Energy saving+miniaturization design

2 small amounts of rinsing water

3 can handle oily sludge

4 can handle various types of sludge

5. Suppression of secondary pollution+easy maintenance

6 can operate continuously and automatically

7-axis mounting

Technical advantages of stacked screw sludge dewatering machine

The equipment is not easily blocked and runs continuously automatically

Save operating costs without secondary pollution

Lightweight and durable body, saving engineering investment

Enhance phosphorus removal function

Operation process of stacked screw sludge dewatering machine

The sludge in the sludge tank is transported to the measuring tank by mercury through sludge transportation. There is no return pipe in the sewage tank, and excess sludge is returned to the sludge tank through the return pipe.

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.

Gonghua undergoes gravity concentration in the concentration section, and a large amount of filtrate is discharged from the filter slot of the concentration section, which is then sent back to the original water tank or regulating tank. 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.

The dehydrated mud cake is discharged from the gap formed by the back pressure plate and the stacked screw 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. The stacked screw sludge dewatering machine developed and produced by Dezhou Hongman Environmental Protection Technology Co., Ltd. belongs to the screw press dewatering machine, which does not require sedimentation tanks and sludge concentration tanks, and can save the construction cost of sewage stations. The stacked screw sludge dewatering machine cleverly uses automatic updating filter cake filtration technology to replace traditional filter screen filtration. The self updating filter cake filtration technology ensures the continuous and stable separation effect of sludge and water in the dewatering machine. Through the strong squeezing force generated by the change of screw diameter and pitch, as well as the small gap between the moving ring and the fixed ring, the sludge is squeezed and dehydrated. It is a new type of solid-liquid separation equipment. The sewage pipe of the flocculation mixing tank is only used for cleaning the mixing tank!