Multi Disc Screw Press – The Smart Solution for Modern Sludge Dewatering
Sludge dewatering is one of the most critical operations in any wastewater treatment plant. High moisture content in sludge increases disposal costs, energy usage, and operational complexity. To overcome these challenges, the Multi Disc Screw Press has emerged as one of the most reliable and cost-effective technologies for efficient sludge management.
The Multi Disc Screw Press is a compact, continuous dewatering system that combines flocculation, thickening, dewatering, and filtration into a single automated process. Unlike conventional systems such as centrifuges, belt presses, or filter presses, this technology can directly accept sludge from the aeration or oxidation tank, eliminating the need for separate thickening and storage tanks. This significantly reduces civil construction costs and overall plant footprint.
The process begins with flocculant preparation, where polymers are mixed with sludge to form large flocs. These flocs enter the thickening zone, where a series of fixed and rotating rings allow free water to drain through while retaining solids. In the dewatering zone, a slow-moving screw conveyor progressively compresses the sludge against an adjustable back plate, squeezing out more water. Finally, the dewatered sludge exits as a semi-dry cake, while the filtered water can be recycled or reused.
One of the biggest advantages of the Multi Disc Screw Press is its clog-free design. The alternating fixed and moving rings continuously self-clean, preventing blockages and eliminating the need for consumables like filter cloths. This makes the system highly suitable for oily, fibrous, or variable sludge. The machine also operates at very low speeds (2–4 rpm), resulting in extremely low power consumption—often only 5–12% of what a centrifuge or belt press requires.
Key benefits include:
Low energy and water consumption
Fully automatic, unmanned operation
Minimal noise and vibration
Low maintenance and breakdown rates
Compact footprint with modular scalability
The technology is widely used in municipal STPs, industrial ETPs, pharmaceutical plants, food and dairy units, textile industries, and chemical processing facilities. With capacities ranging from small plants to large-scale installations (up to 133 m³/hr and scalable through parallel systems), it suits both new projects and retrofits.
Compared to traditional dewatering systems, the Multi Disc Screw Press offers lower OPEX, reduced manpower, and better long-term reliability. It also eliminates odour issues since sludge is not stored for long periods, improving working conditions and environmental compliance.
GreenSew Multi Disc Screw Press systems are designed for continuous performance with strong service support, operator training, and customizable models. For modern wastewater treatment plants focused on sustainability, efficiency, and cost control, the Multi Disc Screw Press is not just an upgrade—it is a strategic investment in smarter sludge management.