Description

The sludge screw press is a new type of solid-liquid separation equipment that utilizes the principle of screw extrusion. It employs the powerful squeezing force generated by variations in screw diameter and pitch, along with the minimal gap between the moving rings and fixed rings, to achieve sludge dewatering through extrusion. Integrating a fully automatic control cabinet, flocculation conditioning tank, sludge concentration and dewatering unit, and a liquid collection tank, the overlapping screw sludge dewatering machine enables efficient flocculation and continuously accomplishes sludge thickening and pressing dewatering under fully automated operation. The collected filtrate is ultimately recycled or discharged.

Applications

Municipal wastewater, petroleum refining, printing & dyeing, papermaking, coal chemical processing, mineral processing, biochemical pharmaceuticals, steel pickling, brewing, tanning, food processing, and sugar production.

Advantages

1. Low operating costs: Less than 40% of belt filter presses and under 20% of centrifugal dehydrators.
2. Energy-saving: Consumes less than 5% of the electricity used by centrifugal dehydrators.
3. Water-saving: Uses less than 0.1% of the water consumed by belt filter presses.
4. Chemical-saving: Reduces chemical usage by an average of 60%.
5. Compact size: Cuts investment in dewatering facilities by over 60%.
6. Ideal for treating sludge containing oils, fats, and fibrous materials.

Working Principle

During operation, sludge enters the filter cylinder through the feed inlet and is pushed toward the discharge outlet by the spiral shaft blades. As the pitch between the spiral blades gradually decreases, the pressure on the sludge continuously increases, initiating dewatering under the pressure difference. Water is expelled through the filtration gaps between the fixed and moving rings. Simultaneously, the self-cleaning function between the moving and fixed rings clears the filtration gaps to prevent clogging. After thorough dewatering, the sludge cake is discharged from the outlet via the propulsion of the spiral shaft.

Main Features

• Simple process flow, high-efficiency and energy-saving sludge dewatering, low system investment
• Programmable system settings for convenient and precise operation
• Unique flocculant formulation for improved sludge dewatering
• Accurate and uniform chemical dosing, reducing operating costs