Maximize Cake Dryness with Continuous High-Pressure Dewatering

Q: What is the main difference between your High-Pressure model and a standard belt press?

The main difference lies in the roller configuration and pressure intensity. Standard belt presses use fewer rollers with moderate tension. Our High-Pressure Belt Filter Press features more rollers, creating an extended high-pressure zone with 6 to more than 12 shear rollers. The rollers are arranged from large to small diameters, causing pressure to increase progressively up to 1.5 MPa as the sludge passes through. This design typically produces a filter cake that is 5% to 10% drier than standard belt presses.

Q: Why choose a High-Pressure Belt Press over a Plate Frame Press?

A High-Pressure Belt Press bridges the gap between efficiency and dryness. While plate frame presses offer high cake dryness, they operate in batch mode with intermittent cycles. The High-Pressure Belt Press operates continuously, 24/7, allowing it to handle much larger volumes while achieving dryness levels significantly higher than standard belt presses.

Q: Can the filter belts withstand the higher tension and pressure?

Yes. We use heavy-duty filter belts designed specifically for high-pressure applications. The belts are made from reinforced polyester or polyamide with high tensile strength. They use stainless steel clipper seams or seamless woven joints to prevent breakage under high tension of 8 to 10 kN per meter. With precision-aligned rollers minimizing wear, belt life is comparable to standard units, typically 3,000 to 4,000 operating hours depending on sludge characteristics.

Q: Is this suitable for secondary biological sludge?

Yes. Secondary biological sludge is often slippery and difficult to dewater. Our design includes a long wedge zone for pre-compression, which gently stabilizes the sludge before it enters the high-pressure zone. This prevents side-spillage and ensures effective deep dewatering.

Q: Is this high pressure belt filter machine suitable for hard-to-dewater secondary sludge?

Yes. Hard-to-dewater secondary biological sludge from municipal or industrial sources is gelatinous and difficult to press. The machine’s wedge zone applies gradual pre-pressure before the sludge enters the high-pressure S-roll zone. This prevents leakage at the sides and allows maximum pressure to be applied effectively, even for difficult sludge types.

Q: What is the typical throughput and cake dryness for my industry?

Performance depends on the material being processed. Typical results for High-Pressure Belt Filter Presses are municipal sludge with cake solids of 20% to 25% compared to 16% to 18% for standard presses, coal washing or tailings with cake solids of 75% to 85%, and paper pulp with cake solids of 40% to 50%. Pilot testing is strongly recommended to confirm performance for specific materials.

Engineered with an extended high-pressure shear zone and decreasing roller diameters. Loway’s High-Pressure Belt Filter Presses bridge the gap between standard belt presses and plate presses, delivering superior solid-liquid separation for mining tailings, industrial sludge, and municipal wastewater.

The Power of High-Pressure Shear Force

Standard belt presses often leave too much moisture behind. Loway Equipment introduces the next generation of High-Pressure Belt Filter Presses (H-BFP).

Unlike conventional units, our system features a specialized High-Pressure Zone where the filter belt wraps around a series of S-shaped rollers with progressively decreasing diameters. This design generates immense shear force (up to 1.5 MPa) and surface pressure, squeezing out capillary water that standard machines cannot remove.

Why Upgrade to High Pressure?

Drier Filter Cakes: Achieves 5-10% lower moisture content than standard low-pressure units.
Deep Dewatering: Specifically effective for hard-to-dewater biological sludge and fine mining tailings.
Continuous Economy: Get the dryness levels approaching a chamber press, but with the 24/7 continuous throughput of a belt press.

4-Stage Progressive Dewatering Technology

Working Principle of Loway High-Pressure Belt Filter Press:

Our system utilizes a “Chemical Pretreatment + Multi-Stage Physical Squeezing” process to ensure the integrity of flocculated solids while maximizing water removal.

Sludge is mixed with a precise polymer (flocculant) in our static/dynamic mixer. This neutralizes charges and binds fine particles into large, stable flocs, releasing free water instantly.

The flocculated sludge feeds onto the gravity belt. Porous filter belts allow the majority of free water to drain naturally, transforming the sludge from a liquid to a semi-solid state (90-92% moisture) ready for compression.

The sludge enters the “Wedge Zone” where the upper and lower belts gradually converge. This applies gentle, increasing pressure to stabilize the sludge cake and prevent side-spilling before high-pressure application

In the final stage, the sludge cake passes through a series of S-shaped rollers with decreasing diameters. The belt tension creates massive shear force (up to 1.5 MPa), squeezing out capillary water to produce the driest possible cake.

Engineered for High Tension and Heavy Loads

Key Features & System Structure

A High-Pressure Belt Press requires a significantly stronger build than a standard unit. We design ours to withstand extreme shear forces without structural deformation.

Features a specialized array of 6–12+ shear rollers arranged with decreasing diameters. This creates a progressive pressure gradient that maximizes water removal path length and intensity.

Constructed with high-strength Carbon Steel (or 304/316 Stainless Steel) featuring reinforced cross-beams. Designed to withstand high belt tension (8–10 kN/m) and continuous hydraulic load, ensuring zero frame distortion over decades of use.

Equipped with premium, multi-layer woven belts (Polyester/Polyamide) specifically designed to endure high mechanical stress and abrasion while maintaining excellent cake release properties.

Heavy-duty cylinders maintain constant, high belt tension to ensure consistent dewatering results, automatically compensating for belt stretching.

Integrated Siemens/Omron PLC monitors the high-pressure environment in real-time. Includes automatic misalignment correction and over-pressure emergency stops to ensure safe, unattended 24/7 operation.

Equipment Selection Guide

Comparing Belt Presses vs. Chamber Presses vs. Vacuum Filters.

Choosing the right dewatering equipment is critical for balancing cake dryness, throughput capacity, and operational costs (OPEX). While every technology has its place, Loway’s High-Pressure Belt Filter Press offers the optimal solution for industries requiring continuous, high-volume processing.

Here is how our technology stacks up against traditional alternatives:

Choosing the right dewatering equipment is critical. While Plate Presses are known for dryness, they are intermittent. While Standard Belt Presses are continuous, they are often too wet. Loway High-Pressure Belt Filter Presses offer the optimal balance.

Loway High-Pressure Belt Press vs. Chamber/Plate Press

The Battle of “Continuous” vs. “Batch”

Chamber press/Plate Press: Excellent dryness, but operates in batches. Stopping to fill and discharge creates downtime and reduces overall throughput capacity.
Loway High-Pressure Solution: Operates continuously 24/7. By utilizing high-shear rollers, we achieve cake dryness levels much closer to plate presses than standard units, but with vastly superior processing volume per hour.

Loway High-Pressure Belt Press vs. Vacuum Filter

The Battle of “Shear Force” vs. “Suction”

Vacuum Filter: Relies on limited atmospheric pressure (max 1 bar) and consumes high energy for vacuum pumps. Often leaves cakes wet.
Loway High-Pressure Solution: Uses mechanical shear pressure up to 15 bar (1.5 MPa). This physical squeezing is far more effective at removing capillary water than vacuum suction, consuming significantly less energy.

Comparison Matrix

Feature	Loway High-Pressure Belt Press	Standard Chamber/Plate Press	Vacuum Disc/Drum Filter
Operation Mode	Continuous (24/7 Non-stop)	Batch (Intermittent)	Continuous
Throughput Capacity	High (Ideal for large flows)	Low to Medium	Medium
Cake Moisture	Low (Optimized by High Pressure)	Very Low	Medium/High
Energy Consumption	Low (Mechanical drive only)	Medium (High pressure pumping)	High (Vacuum pumps required)
Footprint	Compact	Large (Requires space for plate opening)	Medium
Noise & Vibration	Low	Low	High (Vacuum pump noise)
Ideal Application	Mining, Sand Washing, Municipal (High Volume)	Chemical, Fine Ceramics (Low Volume, High Dryness)	Specific Chemical Processes

Summary for the Buyer

Select Loway High-Pressure Belt Filter Press if:

You need to process large volumes of sludge continuously without interruption.
You require a drier cake than standard belt presses can provide (e.g., for dry stacking or lower disposal fees).
You want to minimize labor costs with a fully automated system.
You are looking for high performance with lower operational costs (OPEX) compared to centrifuges or vacuum filters.

High-Performance Solutions for Demanding Industries

Municipal Water Treatment (Deep Dewatering)

Application: Residual activated sludge, Digested sludge.
High-Pressure Advantage: Reduces sludge volume by an extra 10-15% compared to standard presses. This massive reduction in weight significantly lowers transport and landfill tipping fees.

Mining & Tailings (Tailings Dry Stacking)

Application: Iron, Copper, Gold tailings, Coal washing slime.
High-Pressure Advantage: Achieves the critical <20% moisture threshold required for dry stacking, eliminating the risk of tailings dam failures.

Construction & Sand Washing (High Volume)

Application: Shield tunneling mud, Sand washing wastewater.
High-Pressure Advantage: Handles high-volume abrasive slurry continuously, turning liquid mud into stackable solids that don’t drip during transport.

Industrial & Chemical (Hazardous Waste)

Application: Chemical gypsum, Electroplating sludge, Textile sludge.
High-Pressure Advantage: Essential for hazardous waste where disposal is charged by weight. Maximum dryness equals maximum cost savings.

Livestock & Agriculture (Bedding Recovery)

Application: Cow manure, Biogas digestate.
High-Pressure Advantage: Squeezes manure fibers dry enough (65% moisture) to be immediately reused as fluffy, hygienic cattle bedding (RMS), replacing expensive straw or sand.

Food & Beverage (Juice Yield)

Application: Apple pomace, Vegetable pulp, Brewer’s grains.
High-Pressure Advantage: The high shear force acts like a continuous juicer, extracting more liquid yield per ton of raw material than low-pressure alternatives.

Technical Specifications & Selection Guide

Choosing the right High-Pressure model depends on your specific throughput (flow rate) and sludge characteristics.

Parameter	Municipal Sludge	Sand Washing / Mining	Tailings Dry Stack
Roller Configuration	6-10 S-Type Rollers	8-12 Flat/High-Pressure Rollers	10-14 Super High-Pressure Rollers
Belt Width	1.0m – 2.5m	2.0m – 3.0m	2.5m – 3.0m+
Pressure Intensity	High Shear (Biological flocs)	High Pressure (Abrasion resistant)	Ultra-High Pressure (Max density)
Typical Cake Moisture	75% – 80%	15% – 20%	< 20%

Selection Calculation Tip:
To estimate the required Belt Width (B), you can use the following logic:

Belt Width (m) ≈ [Target Capacity (m³/h) × Solid Content] ÷ [Belt Speed × Loading Rate]
Note: High-pressure models typically run at slightly slower belt speeds to maximize the squeezing time in the high-pressure zone.

Expert Tip: Contact our engineers for a Free Sizing Calculation tailored to your specific material density and dryness targets.

FAQ About High-Pressure Belt Filter Presses

Have More Questions? Our technical team is ready to provide detailed, personalized guidance.

Q1: What is the main difference between your "High-Pressure" model and a standard belt press?

The key difference lies in the roller configuration and pressure intensity.
While standard belt presses use fewer rollers with moderate tension, our High-Pressure Belt Filter Press features:

More Rollers: An extended high-pressure zone with 6–12+ shear rollers.
Decreasing Roller Diameters: The rollers are arranged from large to small. As the sludge passes through, the pressure intensity increases progressively (up to 1.5 MPa), squeezing out capillary water that standard presses leave behind.
Result: This design typically produces a cake that is 5%–10% drier than standard models.

Q2: When choose a High-Pressure Belt Press over a Plate Frame Press?

It bridges the gap between efficiency and dryness. While a plate press offers high dryness, it is a batch process (slow, intermittent). Our High-Pressure Belt Press operates continuously (24/7), handling significantly larger volumes while achieving dryness levels that are substantially better than those of standard belt presses.

Q3: Can the filter belts withstand the higher tension and pressure?

Yes. We use Heavy-Duty Filter Belts specifically woven for high-pressure applications.

Material: Reinforced Polyester/Polyamide with high tensile strength.
Joints: Stainless steel clipper seams or seamless woven joints to prevent breakage under high tension (8–10 kN/m).
Life Expectancy: Despite the higher pressure, our precision-aligned roller system minimizes wear, offering a belt life comparable to standard units (3,000–4,000 hours depending on sludge).

Q4: Is this suitable for secondary biological sludge?

Yes. Biological sludge is often “slippery” and hard to press. Our design includes a long Wedge Zone (Pre-compression) that gently stabilizes the sludge before it enters the High-Pressure zone, preventing side-spillage and ensuring effective deep dewatering.

Q5: Is this high pressure belt filter machine suitable for "hard-to-dewater" secondary sludge?

Absolutely. Secondary biological sludge (from municipal or industrial sources) is gelatinous and hard to press.
Our machine’s “Wedge Zone” (Pre-pressure) gently stabilizes the sludge before it enters the High-Pressure S-Roll Zone. This gradual pressure increase prevents the sludge from “leaking” out the sides (side-spillage), allowing us to apply maximum pressure effectively to even the most difficult sludges.

Q6: What is the typical throughput and cake dryness for my industry?

Performance varies by material, but typical High-Pressure results are:

Municipal Sludge: Cake solids 20%–25% (vs. 16-18% on standard presses).
Coal Washing/Tailings: Cake solids 75%–85%.
Paper Pulp: Cake solids 40%–50%.
We highly recommend a pilot test to guarantee these figures for your specific material.

Maximize Cake Dryness with Continuous High-Pressure Dewatering