Multi disc screw press
The Multi Disc Screw Press, also known as a multi disk screw press, a volute dewatering press, a volute screw press, is an advanced sludge dewatering technology designed for efficient, continuous, and low-maintenance operation. Unlike traditional dewatering equipment, it combines a screw shaft with multiple fixed and moving rings, creating a self-cleaning mechanism that prevents clogging and ensures stable performance. The multi disc screw press allows for automatic continuous sludge flocculation, thickening, dewatering and filtrate discharging. The thickening zone allows the system to process both highly concentrated sludge as well as sludge with a high-water content.
This system is widely used for municipal and industrial wastewater treatment, offering a compact design, low energy consumption, and high solid capture rate. With its ability to handle oily, fibrous, and highly variable sludge, the Multi Disc Screw Press provides a cost-effective and environmentally friendly solution for sludge volume reduction and water recovery.
Applications of Multi Disc Screw Press
The Multi Disc Screw Press is widely used for sludge dewatering across various industries thanks to its continuous operation, low energy consumption, and high efficiency. Its versatility makes it suitable for both municipal and industrial wastewater treatment. Typical applications include:
- Municipal wastewater treatment plants – for thickening and dewatering of primary, secondary, and digested sludge.
- Food and beverage industry – processing sludge from breweries, dairies, slaughterhouses, and meat or fish processing plants.
- Pulp and paper mills – handling fiber-rich sludge and other process residues.
- Chemical and pharmaceutical industries – managing sludge containing fine particles and organic matter.
- Textile and tanning industry – for sludge generated in dyeing, finishing, and leather treatment processes.
- Agriculture and biogas plants – dewatering livestock manure, biogas digestate, and organic residues.
By replacing traditional dewatering systems such as belt presses or centrifuges, the Multi Disc Screw Press offers a more compact, cost-effective, and environmentally friendly solution for sludge management.
Process Flow Overview
In the sludge dewatering process, raw sludge from the Sludge Tank is first transferred by a Sludge Pump. Before entering the dewatering stage, a Polymer Preparation Unit and Dosing Pump add and mix flocculants, enhancing sludge conditioning for efficient separation. The conditioned sludge then flows into the Multi-Disc Screw Press, the key equipment of the process. Here, water is effectively separated from solids through a continuous, low-energy operation, producing a dewatered sludge cake. The cake is discharged onto a Shaftless Screw Conveyor and transported for final disposal or further use, while the filtrate is returned for treatment. This streamlined system ensures reliable, automated sludge management with reduced operating costs and minimal operator attention.
- Continuous & Reliable Operation
– Self-cleaning design prevents clogging, ensuring stable performance. - Low Energy Consumption
– Consumes far less power compared to traditional belt presses or centrifuges. - Compact & Easy to Maintain
– Small footprint, minimal operator attention, and reduced maintenance costs. - Versatile Applications
– Suitable for municipal plants as well as food, chemical, paper, and other industries. - Eco-Friendly Solution
– Reduces sludge volume, cuts disposal costs, and promotes water reuse.
Main Structure of Multi Disc Screw Press
The Multi Disc Screw Press is designed with a compact and durable structure that ensures stable operation and minimal maintenance. Its main components include:
- Screw Shaft
– A central, slowly rotating screw that transports and compresses the sludge as it moves forward. - Fixed and Moving Rings (Discs)
– A unique arrangement of alternating fixed and movable rings forms the dewatering cylinder. The slight movement of the rings prevents clogging and maintains continuous filtration. - Sludge Inlet & Flocculation Tank
– The pre-mixed sludge enters the press after flocculation with polymer, ensuring efficient separation of water and solids. - Filtrate Outlet
– Allows separated water to drain out through the gaps between the rings. - Sludge Cake Outlet
– The compacted and dewatered sludge is discharged continuously at the end of the screw. - Drive System
– A low-speed motor and gearbox provide the torque required to rotate the screw shaft, ensuring low power consumption and quiet operation. - Control Panel
– Offers automated operation with monitoring and safety functions, making the system easy to operate and maintain.
This unique structural design ensures that the Multi Disc Screw Press achieves high dewatering efficiency while remaining resistant to clogging, even when processing oily or fine-particle sludge.
Working Principle of Multi Disc Screw Press
The Multi Disc Screw Press operates on a simple yet highly effective principle of continuous sludge thickening and dewatering.
Sludge Conditioning – Sludge from the wastewater treatment process is first mixed with a polymer flocculant in the flocculation tank. This step causes fine suspended particles to form larger, more easily separable flocs.
Sludge Feeding – The conditioned sludge flows into the dewatering cylinder, which is formed by alternating fixed and moving rings around a central screw shaft.
Gravity Drainage – As the screw slowly rotates, free water in the sludge drains through the gaps between the rings under gravity, reducing the water content at an early stage.
Progressive Compression – The screw conveys the sludge forward while the spacing between the rings gradually narrows. This applies increasing pressure, squeezing out more water from the sludge.
Continuous Discharge – The separated filtrate exits through the water outlet, while the compressed sludge cake is discharged continuously from the end of the screw.
Because the moving rings constantly shift slightly during operation, clogging is prevented, and the press can handle oily, fibrous, or fine-particle sludge without interruption. The low-speed rotation ensures low energy consumption, minimal noise, and long service life.
Technical parameters
| Designation | Dry Solids Capacity | Sludge Treatment Capacity / Water Flow (m3/h) | Dimensions (M) | Weight | Power | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2000 | 5,000 | 10,000 | 20,000 | 25,000 | L | W | H | ||||
| (KG/h) | mg/l | mg/l | mg/l | mg/l | mg/l | meter | meter | meter | Kg | Kw | |
| MDSP-131 | 6 – 10 | 3.5 | 1.4 | 1 | 0.5 | 0.4 | 2.4 | 0.75 | 1.2 | 280 | 0.62 |
| MDSP-132 | 12 – 20 | 7 | 2.8 | 2 | 1 | 0.8 | 2.4 | 0.91 | 1.2 | 460 | 0.87 |
| MDSP-201 | 20 – 30 | 10 | 4 | 3 | 1.5 | 1.2 | 2.6 | 0.8 | 1.55 | 600 | 0.74 |
| MDSP-202 | 30 – 60 | 19 | 7.6 | 6 | 2.8 | 2.4 | 2.8 | 0.95 | 1.65 | 1020 | 1.11 |
| MDSP-203 | 57 – 90 | 28 | 11 | 9 | 4.3 | 3.6 | 3.12 | 1.27 | 1.78 | 1430 | 1.86 |
| MDSP-301 | 40 – 60 | 19 | 7.6 | 6 | 3 | 2.4 | 3.12 | 0.86 | 1.88 | 880 | 1.12 |
| MDSP-302 | 70 – 120 | 36 | 15 | 12 | 5.8 | 4.8 | 3.22 | 1.12 | 1.93 | 1340 | 2.25 |
| MDSP-303 | 115 – 180 | 56 | 22 | 18 | 8.6 | 7 | 3.54 | 1.45 | 1.93 | 2260 | 3 |
| MDSP-351 | 65 – 100 | 33 | 13 | 10 | 5 | 4 | 3.46 | 0.95 | 1.96 | 1150 | 1.3 |
| MDSP-352 | 125 – 200 | 63 | 25 | 20 | 9.5 | 8 | 3.64 | 1.26 | 2.01 | 2160 | 2.25 |
| MDSP-353 | 186 – 300 | 95 | 37 | 30 | 14 | 12 | 3.92 | 1.63 | 2.01 | 3160 | 3.35 |
| MDSP-401 | 95 – 150 | 48 | 19 | 15 | 7.5 | 6 | 4.42 | 1.18 | 2.1 | 1860 | 1.85 |
| MDSP-402 | 180 – 300 | 92 | 36 | 30 | 14 | 12 | 4.68 | 1.36 | 2.16 | 3280 | 3.3 |
| MDSP-403 | 280 – 450 | 138 | 55 | 45 | 22 | 18 | 4.96 | 1.78 | 2.23 | 4560 | 5.5 |
| MDSP-404 | 360 – 625 | 180 | 80 | 60 | 30 | 25 | 5.1 | 2.21 | 2.31 | 5100 | 7 |
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