Before treated wastewater is released back into the environment, the sludge it contains must be removed to protect rivers, lakes and groundwater. Sludge dewatering is also the most effective way to reduce waste volume — making the remaining solids cheaper and easier to transport and dispose of. This is the critical job of the press filter belt, the dewatering medium inside a belt filter press.
Drawing on decades of experience in process belts, PFM Screen supplies two proven sludge dewatering belt types — Woven Press Filter Belts and Spiral Press Filter Belts — which also serve as conveyor belts, filter belts or screen belts across a wide range of industrial processes.
Conditioned sludge is fed onto the moving filter belt inside the belt press. Water drains through the open mesh, then a series of press rollers squeeze out further moisture until a dry, easily-handled filter cake remains and is discharged at the end of the press.
Step 1 Sludge Feed Conditioned sludge is spread evenly onto the moving belt at the feed end. | Step 2 Gravity Drainage Free water drains through the open mesh by gravity in the drainage zone. | Step 3 Pressing Press rollers squeeze out further moisture to raise the dry solids content. | Step 4 Cake Discharge The dewatered cake strips cleanly from the belt for easy disposal. |
01 Water & Air Permeability Good water and air permeability for fast, efficient dewatering | 02 Easy to Clean Waste is easily stripped and the belt cleans quickly between runs | 03 Chemical Resistance Acid-resistance and alkali-resistance for demanding sludge streams | 04 Long Service Life High lateral stability and mechanical strength with excellent wear resistance |
Municipal & Industrial Wastewater ● Sludge dewatering before wastewater release ● Reducing waste volume for easier disposal ● Sewage and industrial effluent treatment plants | Food & Organic Fertiliser ● Fruit juice production ● Organic fertiliser production ● Food by-product dewatering |
Mining & Wood Processing ● Mining slurry and tailings dewatering ● Wood processing effluent ● Flue gas desulfurisation (FGD) gypsum | Other Process Duties ● Use as conveyor belts, filter belts or screen belts ● General industrial filtration and drainage ● Continuous solid–liquid separation |
PFM Screen supplies two types of sludge dewatering belt, both woven from high-quality polyester monofilament for excellent wear resistance and a long service life:
 ● Dense woven structure for high solids retention and strong dewatering ● High mechanical strength and lateral stability ● Can be used as a conveyor, filter or screen belt |  ● Available with flat wire or round wire filling ● Flexible spiral structure for high permeability and easy cleaning ● Can be used as a conveyor, filter or screen belt |
● Good water permeability and air permeability ● Waste is easily stripped, easy to clean ● Acid-resistance and alkali-resistance | ● Woven with high-quality polyester monofilament ● Excellent wear resistance and long service life ● High degree of lateral stability and high mechanical strength |
| Feature | Woven Press Filter Belt | Spiral Press Filter Belt |
|---|---|---|
| Structure | Dense woven polyester monofilament | Flexible spiral links with flat or round wire filling |
| Solids retention | High | Medium – high |
| Permeability | Good | High |
| Cleaning | Easy — waste strips cleanly | Easy |
| Best for | High-solids dewatering, high mechanical strength | High permeability and flexible conveying |
Q1: What is the difference between woven and spiral press filter belts? Woven press filter belts have a dense woven structure for high solids retention and mechanical strength. Spiral press filter belts use flexible spiral links with flat or round wire filling for higher permeability and easier cleaning. |
Q2: Can these belts be used for other purposes? Yes. Both belt types can also be used as conveyor belts, filter belts or screen belts across a range of industrial processes. |
Q3: What materials are used and how resistant are they? The belts are woven from high-quality polyester monofilament with excellent wear resistance, acid-resistance and alkali-resistance for a long service life. |
Q4: Which belt should I choose for my sludge? Tell us your sludge type, solids content and belt press model. Our engineers recommend the woven or spiral belt that best balances permeability, retention and cleaning for your specific stream. |
Q5: Can the belt match my existing filter press? Yes. We manufacture to your exact width, length and joining type, and can match an existing belt for a drop-in replacement. |
Q6: How do I get a quote? Send your sludge type, belt press or filter model, and belt width/length to polyestermesh@pfmscreen.com or WhatsApp +86 153 6967 9157 for a factory-direct quotation. |
Get a Custom Sludge Dewatering Belt Specification Within 24 Hours Share your sludge type, belt press or filter model, and belt width/length — PFM Screen will recommend the right woven or spiral belt and send a factory-direct quotation. WhatsApp: +86 153 6967 9157 Email: polyestermesh@pfmscreen.com |
