The belt press filter is a sludge treatment equipment designed and manufactured by our company, utilizing belt tension and roller system pressure for continuous mechanical dewatering. Through a stepwise pressurization process involving gravity dewatering, wedge pre-pressing, and multi-stage pressing, this product aims to achieve continuous and highly efficient dewatering and volume reduction of municipal and industrial sludge, providing a stable and high-capacity solution for subsequent sludge disposal or resource utilization.
- Structure and Working Principle
- Core structural composition
The equipment is a continuously operating frame structure, with the core system comprising:
- The belt system: Two closed polyester filter belts (upper and lower filter belts) serve as the core medium for sludge carrying and filtration.
- The roller set and frame: includes the drive roller, tension roller, correction roller and a series of pressing roller, which are arranged and installed on the rigid frame at a specific angle to form a pressure gradient from sparse to dense.
- Sludge conditioning and sludge spreading system: includes flocculant dosing device, mixing reactor (static or dynamic), and sludge spreading device for spreading the flocculated sludge evenly on the filter belt.
- Drive and tensioning system: The filter belt is driven by a motor and reducer, with pneumatic or hydraulic tensioning devices to maintain constant tension.
- Cleaning and alignment system: The high-pressure spray device cleans the filter belt during regeneration, while the automatic alignment mechanism ensures stable operation.
- Control system: Integrated electronic control cabinet, which can control drive, tension, correction, cleaning and alarm.
- Working Principle
The equipment follows the process route of "chemical conditioning—gravity dewatering—mechanical pressing":
- After the sludge and flocculant fully react in the mixer to form solid flocs, they are evenly spread onto the running upper filter belt. In the gravity dewatering zone, a large amount of free water is naturally filtered out through the filter belt.
- Cuneiform preloading: The sludge then enters the gradually narrowing wedge-shaped zone between two filter belts, subjected to slowly increasing lateral pressure, further promoting water separation.
- High-pressure pressing dewatering: The sludge enters an "S" -shaped curved path composed of multiple pressing rollers. In this region, the sludge is subjected to combined effects of surface pressure generated by the tension of the filter belt and shear force, resulting in the extrusion of capillary water and the formation of a low-moisture sludge cake.
- Discharge and filter belt cleaning: The mud cake is scraped off at the filter belt's bend, then the belt is cleaned with high-pressure water to restore permeability before starting the next cycle.
- Continuous operation with high processing capacity: The production process is continuous, enabling a relatively large volume of sludge to be processed per unit time, making it suitable for large-scale sludge dewatering projects with stable sludge production.
- Dewatering efficiency and sludge cake characteristics: Through multi-stage incremental pressing force design, a certain degree of dewatering can be achieved for well-processed sludge. The sludge cake characteristics and centrifuges have their own features, which should be selected according to the properties of the sludge.
- The operational energy consumption is relatively low, with the primary energy expenditure being the drive of the filter belt. Compared to centrifugal dewatering machines that require high-speed rotation, its power consumption per ton of sludge processing may exhibit certain characteristics.
- High degree of automation with visual operation: The continuous and intuitive operation process facilitates observation and adjustment. The automated control system enables interlocked start-stop, automatic tension and deviation correction, providing relatively convenient operation and management.
- The maintenance is relatively simple: the main wear-prone parts are the filter belt, which is easy to replace. The maintenance of mechanical components such as roller bearings follows standardized procedures.
- Main technical parameters
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Parameter item
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Description / Reference Range
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effective width of belt
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Standard series: 1.0m,1.5m,2.0m,2.5m,3.0m
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Processing capacity (dry mud)
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Depending on sludge characteristics and conditioning effectiveness, the typical dosage ranges from 150 to 800 kg DS/h·m (per meter of belt width per hour).
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common belt speed
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1.0 – 10.0 m/min (adjustable continuously)
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slurry moisture content
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The efficiency is closely related to sludge properties and conditioning effects. For municipal mixed sludge, the empirical range is approximately 75% to 82%.
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belt material
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Polyester monofilament or multi-filament woven net, which can be selected based on requirements such as acid/alkali resistance and tensile strength.
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host power
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Depending on bandwidth and configuration, the main drive motor's power range is approximately 2.2 to 11 kW.
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flushing water pressure
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≥ 0.5 MPa to ensure cleaning effectiveness
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control method
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PLC-based automatic control with tension adjustment, deviation correction, and interlock protection functions
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- Typical Application Fields
This equipment is widely used in various scenarios requiring continuous, large-scale sludge dewatering:
- Municipal sewage treatment: dewatering of biochemical sludge (residual activated sludge) and mixed sludge from urban sewage treatment plants.
- industrial waste disposal ：
- Dewatering of organic sludge in papermaking, printing and dyeing, food, pharmaceutical and other industries.
- Dewatering of physicochemical sludge in electroplating, metallurgy, mining and other industries (note filter belt wear and chemical compatibility).
- River and pipe network sludge: after proper conditioning, it can be used for preliminary sludge dewatering.
- Other solid-liquid separation: Some can be used for material dehydration in industries such as gypsum, starch, and brewing.
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