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Sludge Dewatering Belt Filter Press

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What is LZZG sludge dewatering belt filter press?

LZZG Sludge Dewatering Belt Filter Press is a common type of mechanical dewatering equipment. Which is widely used for efficient dewatering of sludge from municipal, industrial, mining and aggregaes wastewater treatment plants. Especially suitable for dewatering of tailings mud such as iron ore, copper ore, lead-zinc ore, fluorite ore, bauxite or rare earth ore; Dewatering operations such as ore dressing wastewater, sand washing mud or wash plant sludge.


The slurry is sandwiched between two tensioned porous belts, by passing those belts through a serpentine of decreasing diameter rollers. Water is then removed from the slurry and a solid material is produced.

belt filter working

How does belt filter press work?

(1) Thickener dehydration: chemical pretreatment stage

The belt filter press has higher requirements for flocculation effect. This machine uses a unique dosing mixer to achieve rapid flocculation and achieve the best flocculation effect.

(2) Gravity dehydration: gravity concentration dehydration stage

The sludge is evenly fed into the mesh belt through the cloth bucket. The sludge runs forward with the filter belt. The free water flows into the water tank through the filter belt under the action of its own weight. The main function is to remove the free water in the sludge, so that the fluidity of the sludge is reduced and ready for further extrusion.

(3) Low/medium pressure dewatering: wedge preloading dewatering stage

After gravity dewatering, it is still difficult to meet the sludge flowability requirements of the press dewatering section. After this stage of slight extrusion dewatering, the sludge is smoothly pressed and dewatered.

(4) High pressure dehydration: the depressurization stage of the clamp press

The filter cake is repeatedly pressed and sheared around the press roll by the upper and lower filter belts. A large amount of capillary action water is removed to gradually reduce the moisture of the mud cake.


  1. Belt press has an easily adjustable and variable wedge compression zone that maximizes process rate and performance.
  2. Suitable for all types of organic sludge and inorganic mud, municipal WWTP sludge, pulp &paper sludge, water plant sludge.
  3. The belt press is constructed with a stainless steel structure and rollers, durable for more than 10 years .
  4. Low power is needed to run the belt filter presses. With long term value and ease of operation.
  5. Compact footprint, 4-stage dewatering and automated operation

Belt Press Applications

Belt Filter Press Application

Belt filter presses are designed for dewatering applications where sludge is particulate, include various types of industrial wastewater sludge, such as sand-making mud, washed sand mud, mine tailings, piling mud, river silt, etc. They are pumped to the deep cone thickener, the flocculant is added to the thickener tank, and the concentration of the sludge in the thickener is increased by 60%-70% under flocculation and gravity precipitation. Then sent to the belt filter presses, under the action of a gravity zone, a wedge zone, and a pressure zone , the sludge cake with water content of less than 20% is formed and the overflow clean water will be re-processing.


Belt Filter Press in Washing PlantLZZG Belt Filter Press for Water Plant Sludge
Download: Belt filter press working principle and operation pdf

Model Feed concentration (%) Filter area (m²) Power (kw) Capacity (t/h) Weight (kg) Dimension (mm)
DY1000 30-40 15.35 17.5 3-5 4000 6000*1700*2000
DY1500 30-40 20.55 20 5-7 5200 8200*2200*1850
DY2000 30-40 24.4 32.8 6-9 6100 9300*2700*1850
DY2500 30-40 34.5 34.8 9-13 10600 10320*3200*2300
DY3000 30-40 44.7 39.3 15-20 14800 14300*3700*2500
DY3500 30-40 54 39.3 18-25 17400 14300*4300*2700


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