Ultimate Guide to Screw Press Sludge Dewatering Machines: Benefits, Principles, and Cost Comparison

Ultimate Guide to Screw Press Sludge Dewatering Machines

Introduction

The screw press sludge dewatering machine is widely used in municipal sewage treatment projects and various industrial sectors such as petrochemical, light industry, chemical fiber, papermaking, pharmaceuticals, and leather. Practical operation has proven that the screw press sludge dewatering machine can create considerable economic and social benefits for customers.

Prensa De Tornillo De La Máquina De Deshidratación De Los Lodos

Working Principle

1. Concentration:

When the screw shaft rotates, the multiple fixed and moving rings surrounding the shaft move relative to each other. Under gravity, water filters out from the gaps between the moving rings, achieving rapid concentration.
2. Dewatering:

The concentrated sludge continuously moves forward with the rotation of the screw shaft. Towards the direction of the sludge cake outlet, the pitch of the screw shaft gradually decreases, and the gaps between the rings also decrease, continuously shrinking the volume of the screw chamber. With the back pressure plate at the outlet, the internal pressure gradually increases. Under continuous rotation and pushing by the screw shaft, water in the sludge is squeezed out, increasing the solid content of the filter cake, thus achieving continuous sludge dewatering.
3. Self-cleaning:

The rotation of the screw shaft drives the moving rings to rotate continuously. The device relies on the movement between the fixed and moving rings to achieve a continuous self-cleaning process, cleverly avoiding the clogging issues common in traditional dewatering machines.

Structural Principle

The main body of the dewatering machine consists of fixed rings and moving rings stacked together, with a screw shaft running through them to form a filtration device. The front part is the concentration section, and the rear part is the dewatering section.
The gaps between the fixed and moving rings and the pitch of the screw shaft gradually decrease from the concentration section to the dewatering section.
As the screw shaft rotates, it pushes the sludge from the concentration section to the dewatering section while continuously driving the moving rings to clean the filter gaps, preventing clogging.

Product Advantages

Wide Applicability:

Suitable for sludge from municipal sewage, food, beverage, chemical, leather, welding material, papermaking, printing and dyeing, and pharmaceutical industries.
Applicable for dewatering high and low concentration sludge. When dewatering low concentration sludge (2000mg/L~), there is no need to build concentration and storage tanks, reducing construction costs and the release of phosphorus and anaerobic odors.

Compact Design:

The compact design includes an electric control cabinet, a measuring tank, a flocculation mixing tank, and the main body of the dewatering machine.
Small footprint, easy maintenance and replacement; lightweight, easy to transport.
Clogging Resistance:

Self-cleaning function. No need for cleaning to prevent clogging of the filter gaps, reducing rinse water consumption and internal circulation burden.
Excels at dewatering oily sludge.

Low Speed Operation:

Screw shaft rotates at about 2-3 revolutions per minute, with very low power consumption.
Few failures, low noise and vibration, safe operation.

Simple Operation:

Through the electric control cabinet, it can be linked with polymer dosing machines, sludge pumps, and dosing pumps to achieve 24-hour continuous unmanned operation.
Short daily maintenance time, simple maintenance tasks.
Durable:

The body is almost entirely made of stainless steel, maximizing service life.
Only the screw shaft and moving rings need to be replaced, with long replacement cycles.

Reduced Design, Construction, and Operating Costs:

A wide range of product specifications and a complete series, allowing for the selection of the most suitable model for different treatment scales, avoiding overcapacity.
The compact design integrates concentration and dewatering, with an electric control cabinet and a sludge flocculation mixing tank, making it compatible with auxiliary equipment and easy to design.
The small design allows for flexible installation, reducing the footprint and construction costs of the dewatering machine itself.
Equipped with sludge concentration function, eliminating the need for concentration and storage units, reducing the overall footprint and construction costs of sewage treatment facilities.
The dewatering machine has a self-cleaning function, eliminating the need for large amounts of water to prevent sludge clogging.
Uses low-speed screw extrusion technology, consuming little power.
The electric control cabinet has automatic control functions, achieving 24-hour fully automatic continuous unmanned operation from sludge conveyance, chemical injection, concentration, dewatering, to sludge cake discharge, reducing labor costs.
Cost Comparison of Screw Press Sludge Dewatering Machine and Centrifugal Sludge Dewatering Machine Over Three Years

Screw Press Operating Costs:

Direct dewatering of low concentration sludge, no need for concentration equipment and space.
Power consumption is 1.95KW per hour. Assuming 12 hours of operation per day at 1 yuan per kilowatt-hour, the annual power consumption cost is 1.95112365=8541 yuan. For 24 hours of operation per day, the annual power consumption cost is 1.95124365=17082 yuan.
Low-speed operation, no vibration, very low noise.
Simple maintenance and management, only needing to replace moving rings and screw shaft. Moving rings replacement cycle is 3-4 years, and screw shaft replacement cycle is up to 11 years.

Centrifugal Machine Operating Costs:

Requires construction of concentration tanks, which are costly.
For the same treatment capacity, the power consumption is 22.5KW per hour. Assuming 12 hours of operation per day at 1 yuan per kilowatt-hour, the annual power consumption cost is 22.5112365=98550 yuan. For 24 hours of operation per day, the annual power consumption cost is 22.5124365=197100 yuan.
High-speed operation, very noisy, affecting workers’ health.
Difficult maintenance and management, with frequent failures of the rotor requiring factory repairs, which are costly and affect production.

Ultimate Guide to Screw Press Sludge Dewatering Machines

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