Belt Type Filter Press for Continuous Sludge Dewatering
Introduction:The belt type filter press is a continuous automatic sludge thickening and dewatering machine widely used in municipal sewage and industrial wastewater treatment. It usually matches supporting equipment including water filter housing and self-cleaning filter to protect feeding pipelines and reduce large impurities entering the main unit. This dewatering equipment runs continuously, featuring large processing capacity, low energy consumption and stable cake solid content. It is widely adopted for paper-making, textile printing, municipal sludge and various industrial sludge treatment. This article covers its working principle, structural composition, core advantages, technical specifications, application scenarios and selection guidance, helping overseas buyers judge whether this continuous dewatering machine fits their wastewater projects.
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Product Introduction
The belt type filter press, also known as belt sludge dewatering machine, is an integrated thickening and pressing filtration device for continuous solid-liquid separation. As a continuous sludge treatment solution, it is often equipped with pre-treatment auxiliary devices such as water filter housing and self-cleaning filter to intercept large debris in the sludge feed, prevent the blockage of dosing pipelines and damage to filter belts. The whole machine adopts unique in-water flocculator flow channel design to realize non-power mixing of sludge and flocculant, which maximizes the flocculation effect. After full flocculation, the sludge enters the gravity thickening zone first, where free water is separated rapidly. Then the thickened sludge enters the wedge pre-pressing zone between the upper and lower filter belts, and gradually squeezes out free water to form stable sludge cake. Afterwards, the sludge cake passes through the S-shaped pressing roller group, under the combined force of extrusion and shearing, capillary water inside the sludge is further removed, and the final dry sludge cake is discharged continuously. The machine is equipped with a probability deviation adjusting mechanism, which keeps the filter belt running in the optimal state and extends its service life. Compared with batch-type plate and frame filter press, this belt filter press supports 24-hour uninterrupted automatic operation, with simpler operation and lower noise, making it more suitable for large-volume continuous sludge discharge scenarios.
Working Principle
The working cycle of the belt type filter press can be divided into flocculation mixing, gravity thickening, wedge pre-pressing, roller squeezing dewatering and filter belt cleaning. First, the sludge and flocculant are transported into the built-in in-water flocculator. The special flow channel structure realizes non-power mixing, so the flocculant can fully react with sludge particles to form large and stable flocs. The pre-filter assembly with water filter housing and self-cleaning filter is installed before the dosing system, to remove large impurities and avoid destroying the formed flocs or scratching the filter belts. After flocculation, the sludge flows into the gravity thickening zone. A high-efficiency thickening filter belt is arranged here, and a large amount of free water seeps through the filter belt quickly under gravity, so the sludge with solid content higher than 1% can directly enter the subsequent pressing process. Then the sludge enters the wedge pre-pressing zone formed by the upper and lower filter belts. The two filter belts gradually close up, and gentle pressure squeezes out the residual free water, turning the loose floc sludge into a mud cake that can bear high pressure. Next, the mud cake enters the S-shaped pressing roller group. Multiple rollers of different diameters produce gradual extrusion and shearing force. The capillary water inside the sludge is squeezed out, and the solid content of discharged mud cake can reach 22%–26% depending on sludge characteristics. After the mud cake is scraped off by the scraper, the dirty filter belts go to the high-pressure cleaning zone. High-pressure water washes away sludge residues on the filter belt, restoring the permeability of the filter belt, and then the filter belts return to the starting point to accept new sludge, realizing continuous circular operation. The probability deviation correction system monitors the running status of filter belts in real time, automatically adjusting the position to prevent belt deviation and prolong service life.
Main Structure
In-water Flocculation Mixer:
Unique flow channel design, no power stirring required, sludge and flocculant fully mixed to form dense flocs.
Gravity Thickening Zone:
Equipped with thickening filter belt, used for preliminary dehydration and concentration of low-concentration sludge.
Wedge Pre-pressing Zone:
Upper and lower filter belts gradually converge, low-pressure pre-dehydration to avoid sludge run-off during high-pressure pressing.
S-type Pressing Roller Group:
Core dewatering component. Multiple rollers arranged in S shape, providing gradient extrusion and shearing force for deep dewatering.
Filter Belt Deviation Correction System:
Probability type deviation adjusting mechanism, automatic correction when the filter belt drifts, stable operation and reduce belt wear.
Filter Belt Cleaning Unit:
High-pressure spray cleaning pipeline, continuous cleaning of filter cloth residues, maintaining stable filtration performance.
Driving & Control System:
Motor and reducer drive the filter belt to run, PLC automatic control cabinet, adjustable belt speed and running parameters.
Pre-filtration Auxiliary Assembly:
Optional water filter housing and self-cleaning filter for raw sludge pre-filtration, protecting the whole machine pipeline and filter belts.
Core Advantages
Continuous Automatic Operation:
It can run 24 hours continuously, no need for repeated feeding and discharging cycles like plate frame filter press, with large daily sludge handling capacity.
Excellent Flocculation Effect:
Built-in in-water flocculator, non-power mixing reduces flocculant consumption, gives full play to the effect of flocculant and improves dewatering stability.
Wide Adaptability for Sludge:
It can handle sludge with inlet solid content ≥1%, suitable for municipal mixed sludge, digested sludge, residual activated sludge, papermaking sludge, printing and dyeing sludge and other industrial sludge.
Low Operation Cost & Low Noise:
Low running power, low energy consumption, low operating noise, suitable for factory and sewage plant indoor working environment.
Automatic Belt Deviation Protection:
Special probability deviation adjusting structure, effectively prevent filter belt deviation, reduce the frequency of replacement, greatly extend the service life of filter belt.
Easy Maintenance:
The whole structure is open, the filter belt can be replaced quickly, the high-pressure cleaning system keeps the filter belt clean automatically, and daily maintenance workload is small.
Stable Drying Effect:
Under normal dosing and operation, the mud cake solid content can steadily reach 22%~26%, which is convenient for subsequent transportation, landfill and resource utilization.
Technical Specification Table
| Item | LF-0.8 | LF-1.0 | LF-1.5 | LF-2.0 | LF-2.5 |
|---|---|---|---|---|---|
| Belt Width (mm) | 800 | 1000 | 1500 | 2000 | 2500 |
| Thickener Power (Kw) | 0.75 | 0.75 | 1.1 | 1.5 | 1.5 |
| Pressing Roller Power (Kw) | 1.5 | 1.5 | 2.2 | 3.0 | 4.0 |
| Thickening Belt Speed (m/min) | 5.15 | 5.15 | 5.15 | 5.15 | 5.15 |
| Pressing Belt Speed (m/min) | 4.14 | 4.14 | 4.14 | 4.14 | 4.14 |
| Cleaning Water Pressure (MPa) | ≥0.5 | ≥0.5 | ≥0.5 | ≥0.5 | ≥0.5 |
| Inlet Sludge Solid Content (%) | ≥1 | ≥1 | ≥1 | ≥1 | ≥1 |
| Outlet Cake Solid Content (%) | 18–22 | 18–22 | 18–22 | 18–22 | 18–22 |
| Handling Capacity (m³/h, solid content 1%) | 5–10 | 10–16 | 16–26 | 26–36 | 36–50 |
| Dry Sludge Output (m³/h) | 0.05–0.1 | 0.1–0.16 | 0.16–0.26 | 0.26–0.36 | 0.36–0.5 |
Application Scenarios
Municipal Wastewater Treatment Plant:
Mixed sludge, digested sludge and residual activated sludge dewatering from urban sewage stations.
Paper-making Industry:
Paper pulp sludge, white water sludge dewatering in paper mills.
Textile Printing & Dyeing Industry:
Dyeing sludge, textile wastewater sludge treatment.
Food & Beverage Factory:
Food processing organic sludge, fermentation residue dewatering.
Chemical Industry:
Fine chemical, coating and pigment wastewater sludge dewatering.
Other Industrial Fields:
Leather, metallurgy, coal washing and other sludge with fine particles.
Buying & Selection Guide
When selecting a belt type filter press, buyers need to provide key parameters: daily sludge volume, inlet solid content, sludge type, pH value, site space, target cake solid content. If the raw sludge contains large impurities, we recommend matching the pre-filter unit composed of water filter housing and self-cleaning filter to avoid filter belt damage and frequent blockage. For sludge with high organic content, the flocculant dosing system needs to be matched and adjusted; for corrosive sludge, we can choose anti-corrosion filter belt and frame coating. If you need small capacity, LF-0.8 / LF-1.0 is suitable; for large sewage treatment plants, LF-2.0 and LF-2.5 models are recommended for high throughput.
FAQ
Q1: What is the difference between belt filter press and plate frame filter press?
A: Belt filter press works continuously, suitable for large and stable sludge flow; plate frame filter press is batch working, higher cake dryness, suitable for scenarios with high requirement on mud cake solid content.
Q2: What is the main consumable part of belt filter press?
A: Filter belt is the main consumable. The supporting water filter housing and self-cleaning filter can reduce impurity impact and extend filter belt service life.
Q3: Can this machine run 24 hours a day?
A: Yes, it is designed for continuous operation. Regular inspection of cleaning water pressure and deviation correction system is required during long-time operation.
Q4: What supporting equipment do we need to prepare?
A: Sludge feeding pump, flocculant dosing machine, high-pressure cleaning water pump, sludge cake conveyor and optional pre-filter assembly.
Q5: Can you customize the machine according to site conditions?
A: Yes. We can adjust frame height, discharge direction and control mode according to customer’s workshop layout.
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