Screw Press Dewatering Equipment

Screw Press Dewatering Equipment in Wastewater Treatment

Screw press dewatering equipment is a widely used mechanical separation technology designed to extract water from solid materials, particularly sludge or other waste products. It finds extensive application in wastewater treatment, industrial processes, and various other scenarios where efficient dewatering is essential.The equipment operates by utilizing a rotating screw or auger housed within a cylindrical screen or drum. This mechanism gradually compresses and squeezes out the liquid content from the solids. Screw press dewatering equipment is especially prevalent in municipal wastewater treatment plants and industrial facilities.

Additionally, it is employed in agricultural operations and other environments where the efficient dewatering of sludge or wet waste materials is necessary before disposal or further processing. The specific design and capacity of screw presses can vary based on the application and the characteristics of the material being processed.

Benefits & Features:

1. Enclosed design to minimize odors and noise
2. Low wash water usage (1/8th compared to belt presses)
3. Very low power consumption (1/20th compared to centrifuges)
4. High solids content in the dewatered cake
5. Minimal operator involvement required
6. Easy to operate and maintain
7. Automatic start-up, operation, and shutdown
8. Optional touchscreen operation
9. Sludge flow and cake monitoring system
10. Available with various options for specific industries like dairy and palm oil

How Does It Work?

1. Concurrent Force and Water Flow: The force and water flow in the same direction, facilitating the rapid separation of free water.
2. Moderate Pressure: Ensures effective sludge dewatering while maintaining low energy consumption and minimal mechanical wear.
3. Thin-Layer Dewatering: Dewatering in thin layers allows for the fastest separation of free water.
4. Extended Dewatering Path: Provides sufficient time and continuous operation for effective dewatering.

How does the screw press dewatering equipment work?

1. Feeding stage: Sludge or wet waste enters the equipment through the feed port. Usually, these materials are evenly distributed in the feed area of ​​the screw press to ensure uniformity of subsequent processing.

2. Preliminary dehydration: In the feeding area, the material first undergoes preliminary dehydration. This stage usually uses gravity to separate and discharge free water from the material.

3. Screw compression: The material enters the screw compression area and the screw shaft (or screw) begins to rotate. The rotation of the screw shaft pushes the material forward while gradually increasing the pressure. The screw shaft is usually designed to gradually narrow, so that the pressure can be gradually increased as the material moves.

4. Screen filtration: There is usually a screen or filter around the screw shaft, through which the liquid is squeezed out, while the solid material is retained in the screw shaft. The aperture size of the screen can be adjusted according to the characteristics of the processed material to achieve the best filtration effect.

5. Further compression: As the material continues to move forward, the pressure increases further and more water is squeezed out. At this point, the material has formed a relatively dry solid “cake”.

6. Discharge stage: Finally, the fully compressed and dehydrated solid material is discharged from the discharge port. These solid materials usually have a low water content, which is convenient for subsequent treatment or disposal.

7. Liquid discharge:The squeezed liquid is discharged through the drain port, and usually the liquid is collected for further treatment or directly discharged.