Screw Press Sludge Dewatering Machine

1. Equipped with a proprietary rotary disc pre-concentration device, it excels at treating low-concentration sludge.
This addresses the shortcomings of existing gravity-based concentration methods, achieving efficient concentration of low-concentration sludge. Flocculation and concentration are completed in a single integrated process, reducing pressure on subsequent dewatering stages. Combined with an adjustable expansion valve, the incoming sludge concentration can be optimized for dewatering. Sludge concentration range: 2000 mg/L - 50000 mg/L
2. Moving and stationary rings replace filter cloths, enabling self-cleaning, clog-free operation, and easy handling of oily sludge.
The screw-type sludge dewatering machine employs a continuous self-cleaning process driven by the relative misalignment of moving and fixed plates during screw shaft rotation. This eliminates clogging issues common in traditional dewatering equipment, delivering strong resistance to oil contamination, effortless separation, and zero blockages. Additionally, it requires no external water for high-pressure flushing, ensuring cleanliness, environmental friendliness, odor-free operation, and zero secondary pollution.
3. Low-speed operation, noise-free, low energy consumption—only 1/8th of belt presses and 1/20th of centrifuges
The screw-stack sludge dewatering machine relies on volumetric internal pressure for dewatering, eliminating the need for large components like drums. Operating at a low speed of 2-4 RPM, it conserves water and energy while producing minimal noise. Its average energy consumption is 1/8th that of belt machines and 1/20th that of centrifuges, with a unit power consumption of just 0.01-0.1 kWh/kg-DS, significantly reducing wastewater treatment system operating costs.
4. Reduced Capital Investment and Enhanced Treatment Efficiency
· Directly processes sludge from aeration tanks and secondary sedimentation tanks without requiring sludge thickening or storage tanks, lowering overall capital investment. This also prevents phosphorus release issues common in traditional thickening tanks, improving the wastewater system's phosphorus removal capability.
· Saves construction investment for structures like thickening tanks and equipment investment for mixers, air compressors, and flushing pumps.
· Compact footprint reduces civil engineering investment for the dewatering plant.
5. Fully automated control for simplified operation and management
The screw-type sludge dewatering machine contains no filter cloths, filter holes, or other components prone to clogging, ensuring simple and safe operation. Based on the customer's operational schedule and integrated with the automatic control system, program settings can be configured to achieve fully automated, unattended operation.

· Dosing Tank
Sludge is pumped into the dosing tank via a sludge transfer pump. Excess sludge is returned to the sludge storage tank through the return pipe.
· Flocculation Mixing Tank
The metered sludge is thoroughly mixed with injected polymer flocculant in the flocculation mixing tank to form well-developed flocs.
· Dewatering Chamber
Sludge enters the dewatering chamber through the inlet. In the front concentration section, rapid gravity concentration occurs, expelling most filtrate. Within the dewatering section, continuous pressure buildup inside the chamber achieves thorough dewatering. *Note: The dewatering chamber of sludge thickeners does not include the dewatering section.
· Sludge Outlet / Concentrated Sludge Discharge Port
A back pressure plate installed at the sludge outlet generates counteracting resistance, further increasing pressure within the main chamber. This enables more thorough dewatering, discharging the sludge as a cake through the outlet. The sludge discharged from the sludge concentrator is concentrated sludge. *The back pressure plate is not installed on the discharge side of the sludge concentrator.