Products Description
The sludge dewatering unit is a commonly used machine for sewage treatment. It is divided into several areas: gravity concentration, wedge pressing, low-pressure dewatering, and high-pressure dewatering. After the sludge and flocculant are automatically mixed in the static mixer, they enter the gravity concentration area for initial dewatering. The sludge is then squeezed in the wedge pressing area, transitioning from a semi-solid state, before entering the high-pressure area after being squeezed in the low-pressure section. In this area, the sludge is subjected to repeated quadrupole squeezing and shear forces. The moisture content of the sludge cake can reach 70%-75%, and the cake is scraped off by the wear-resistant scraper mounted on the driving guide wheel. We can also provide you with matched equipment such as sludge dosing systems, sludge and flocculant mixing systems, flocculant dosing equipment, dosing devices, and dissolving system equipment, compatible with belt dewatering machines or belt filter presses.
The sludge dewatering unit features a unique multi-stage design, resulting in high dewatering efficiency and low moisture content in the filter cake. The belt-type concentrating and dewatering machine operates continuously with low speed and high efficiency. It is equipped with a fully automatic anti-belt deviation device and a pressure increase and decrease system. This belt-type sludge dewatering machine offers easy operation, high reliability, and good safety.
Working principle
Pretreatment Stage - The original slurry undergoes gravity sedimentation to concentrate the sludge, reducing its volume. The concentrated sludge is then mixed with polymer flocculant. Under the action of the flocculant, fine particles in the sludge agglomerate into flocs, which are initially precipitated into sludge, preparing the conditions for further dewatering.
Gravity Dewatering - The flocculated sludge is sent to the filter belt of the belt filter press. Under the influence of the sludge's own weight, the free water outside the flocs is filtered out from the belt, reducing the water content of the sludge.
Wedge Pre-Pressing Dewatering - After gravity dewatering, the sludge undergoes further dehydration in the wedge section. This step ensures that the sludge will not be squeezed out in the pressing and dewatering section of the belt filter press under normal conditions.
Roller Dewatering - The sludge is subjected to repeated squeezing and shearing by multiple rollers arranged optimally in the belt filter press. This action removes a significant amount of capillary water from the sludge, progressively reducing its moisture content. The sludge is then squeezed with fine pressing rollers to form a block-shaped mud cake with minimal water content. The belt-type concentrating filter press integrates concentration, filtration, and dewatering, offering ease of use and high treatment efficiency.
Structure
1. Sludge Mixing and Feeding Device
It consists of a sludge mixer or static mixer and a feeding hopper. After the material and flocculant are fully mixed and reacted in the mixer, they flow to the feeding hopper. The hopper then spreads the material onto the filter belt.
2. Tensioning Device
The tensioning device of the belt-type concentrator and dewatering machine is composed of upper and lower tensioning rollers, tensioning cylinders, and pressure-regulating gauges. The tension of the filter belt can be adjusted within the range of 50-78 N/cm. The upper and lower filter belts can be pressure-regulated separately.
3. Transmission Device
The filter belt transmission of this sludge dewatering machine adopts a stepless reducer. The manual speed control allows the filter belt to travel at speeds ranging from 0.8 to 8 m/min, with the normal operating speed being between 2.0 and 3.0 m/min.
4. Deviation Adjustment Device
The deviation adjustment device of this belt-type concentrator and filter press consists of deviation adjustment rollers, correction cylinders, pressure-regulating gauges, valves, and filter belt correction machine control valves.
5. Filtering and Pressing Device
It consists of upper and lower filter belts, a gravity sludge dewatering section, a "Wedge" shaped pressing section, and an "S" shaped pressing section. The "S" shaped pressing section consists of several dewatering rollers of different diameters. Under the tension of the filter belt, the sludge is wrapped and squeezed in an "S" shape. The diameter of the rollers gradually decreases from large to small, forming a pressure gradient. This ensures that the sludge undergoes a pressing process from lower to higher pressure.
6. Flushing Device
The flushing device of the belt dewatering machine consists of a nozzle and a water-retaining rubber plate in the drainage box. The filter belt can be continuously flushed by connecting the flushing water pump. If the nozzle becomes blocked by suspended matter or dirt, it should be cleaned promptly.
7. Unloading Device
The unloading device of this sludge dewatering machine consists of a knife holder, scraper plate, unloading roller, and tension spring.
8. Frame
The frame of this sludge dewatering machine is welded from various steel sections and coated with anti-corrosion paint.
Main features
Integrated concentration, filtration, and dehydration. It is compact, lightweight, and has a small footprint, with low power consumption and high sludge cake discharge efficiency.
Advanced bridge-type double-pivot, fully automatic pneumatic tensioning mechanism.
Mechanical stepless speed adjustment for controlling the filter belt running speed.
The pressing rollers and guide rollers are made of stainless steel, which is corrosion-resistant and has a long service life.
Pneumatic deviation correction with an alarm and emergency shutdown system.
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