Sludge Dewatering Equipment: How to Choose Between Belt Press, Plate Press, and Screw Press

Belt Press, Plate & Frame Press, or Screw Press? This Comparison Table Tells You Everything

By DAGYEE – Water Treatment Specialist

Introduction: Choose the Right Equipment and Save Years of Trouble

If you work in wastewater treatment, sooner or later you'll face the same question: Which sludge dewatering equipment should I choose?
There are three mainstream options on the market — Belt filter press, plate and frame filter press, and screw press sludge dewatering machine. Each has its own strengths and weaknesses. None is absolutely "better" than the others. It all depends on your specific application.
Choose right, and you get stable operation, low maintenance, and controllable costs.
Choose wrong, and you'll deal with constant clogging, frequent repairs, high electricity bills, and expensive chemicals. Over three years, that could cost you hundreds of thousands.
This article uses one comparison table to clearly explain the differences between these three technologies. Whether you're selecting equipment for a new project or upgrading an existing dewatering system, you'll have a clear answer after reading this.

1. Quick Overview of Three Technologies

Belt Filter Press

A belt filter press uses two tensioned filter belts to squeeze water out of sludge as it passes through a series of rollers. Think of it like wringing out a wet towel.
• Advantages: High capacity, mature technology, relatively low equipment price
• Disadvantages: Filter cloth clogs easily, requires large amounts of wash water, complicated operation, high labor costs
• Best for: Large municipal WWTPs, high-volume projects, facilities with plenty of space

Plate and Frame Filter Press

A plate and frame filter press pumps sludge into a chamber formed by filter plates and frames, then squeezes water out under high pressure.
• Advantages: Lowest cake moisture (as low as 60-70%), dry cake, high solid recovery rate
• Disadvantages: Batch operation (not continuous), labor-intensive cake discharge, long cycle time
• Best for: Applications requiring extremely low cake moisture, projects where reducing sludge disposal weight is critical

Screw Press Sludge Dewatering Machine

The screw press is a newer technology. It uses a screw shaft to push sludge through a chamber formed by alternating fixed rings and moving rings. The volume decreases as the sludge moves forward, squeezing water out. The moving rings rotate with the screw, creating a self-cleaning effect.
• Advantages: Low energy consumption, no clogging, automatic operation, minimal wash water, small footprint
• Disadvantages: Single-unit capacity is relatively limited, sensitive to hard particles
• Best for: Small to medium WWTPs, industrial wastewater (food, slaughterhouse, textile), space-constrained retrofit projects, oily and fibrous sludge

2. One Comparison Table That Tells You Everything

Parameter	Belt Filter Press	Plate & Frame Press	DAGYEE Screw Press
Working Principle	Belt squeezing	High-pressure filtration	Screw squeezing + self-cleaning
Operation Mode	Continuous	Batch	Continuous
Energy Consumption	High	Higher	Lowest
Wash Water Usage	Very high	Medium	Minimal
Filter Cloth/Media Replacement	Frequent	Frequent	No filter cloth
Clogging Risk	High	High	Very low
Labor Requirement	Requires attention	Labor-intensive	Automatic, unattended
Footprint	Large	Large	Small
Cake Moisture	80-85%	60-70%	75-85%
Suitable for Oily Sludge	Poor	Poor	Good
Suitable for Fibrous Sludge	Poor	Poor	Good
Equipment Cost	Low	Medium	Medium
Operating Cost	High	Higher	Lowest
Maintenance Frequency	High	High	Low

3. How to Choose Based on Your Conditions

Oily Sludge → Choose DAGYEE Screw Press
Oil and grease clog filter cloths. When treating oily sludge, belt and plate presses get blinded quickly, requiring frequent cleaning with poor results. The screw press's self-cleaning moving ring design handles oily sludge effectively. For slaughterhouses, food processing plants, and grease trap waste, the DAGYEE screw press is the way to go.

Fibrous Sludge → Choose DAGYEE Screw Press
Fibers from textile, paper, and printing wastewater also clog filter cloths. The screw press's moving ring structure resists fiber wrapping, ensuring continuous stable operation. One textile plant used to clean their belt press filter cloth every two days. After switching to a DAGYEE screw press, a weekly check is all they need.

Extremely Low Cake Moisture Required → Choose Plate & Frame Press
Some projects have special requirements for cake moisture — for example, sludge needs to be below 70% moisture for incineration. For these applications, the plate and frame press is the best choice, producing the driest cake. The trade-offs are batch operation and manual cake discharge.

High Volume, Plenty of Space → Choose Belt Press
Large municipal plants processing hundreds of tons of sludge per day may find that a single screw press doesn't have enough capacity, requiring multiple units in parallel. Belt presses offer high single-unit capacity at a lower equipment cost. If you have the space, the labor, and the water supply, a belt press is still a viable option.

Space-Constrained, High Automation Required → Choose DAGYEE Screw Press
Retrofit projects rarely have extra space. The DAGYEE screw press's compact footprint allows it to fit into existing buildings. Add PLC automatic control, and the system runs with minimal operator attention. One food plant replaced a 200m² belt press system with a DAGYEE screw press that took only 18m² — freeing up space for production expansion.

4. DAGYEE Screw Press: Built for Real-World Conditions

DAGYEE has been designing and manufacturing screw press sludge dewatering machines for over 20 years. We've learned what works and what doesn't. Here's what sets our equipment apart.

Feature	How It Helps You Save
Low-speed screw design	Only 2-5 rpm operation consumes 1/3 the energy of belt presses and 1/5 of centrifuges
Self-cleaning moving rings	No filter cloth means no replacement costs and no clogging downtime
PLC automatic control	Runs unattended 24/7, reducing labor costs significantly
Minimal wash water	Intermittent spray uses only 24-216 liters per hour — 1/50 of a belt press
Integrated screw press	Dewaters screenings to 40-60% solids, reducing disposal volume and weight
Corrosion-resistant construction	SUS304/SUS316L stainless steel — no painting, no peeling, no hidden rust

Built for Tough Applications

DAGYEE screw presses don't run in laboratories. They run in factories with variable flows, changing loads, and operators who have other things to do. We design ours to handle that.
• Forgiving design: Our systems keep working even when inlet conditions change
• Easy access: Everything you need to check or clean is right where you can reach it
• Clear documentation: We provide startup guides, troubleshooting flowcharts, and maintenance schedules that actual operators can understand
• Remote monitoring ready: PLC systems with optional connectivity let you check performance without walking out to the tank

5. DAGYEE Screw Press Technical Specifications

Model	DS Capacity (kg/h)	Sludge Capacity (m³/h)	Power (kW)	Dimensions (mm)	Weight (kg)
DL101	3-5	1.5 / 0.6 / 0.25	0.2	1816×756×1040	290
DL131	6-10	3.0 / 1.2 / 0.5	0.36	1969×756×1040	315
DL202	18-30	9.0 / 3.6 / 1.5	1.1	2930×1257×1470	1110
DL301	30-50	15.0 / 6.0 / 2.5	0.74	3255×985×1600	1320
DL302	60-100	30.0 / 12.0 / 5.0	1.1	3455×1295×1600	2230
DL352	120-200	60.0 / 24.0 / 10.0	6.0	4420×2100×2250	4850
DL403	180-300	90.0 / 36.0 / 15.0	6.0	4420×2100×2250	4850

Specifications Notes:
• DS Capacity: Dry solids processed per hour — the core capacity metric
• Sludge Capacity: Based on inlet concentration — lower concentration requires higher flow capacity
• Cake Moisture: 75-85% depending on sludge characteristics (organic vs. inorganic, conditioning, etc.)
• Solid Recovery Rate: ≥95% — minimal solids lost to filtrate
• Material: SUS304 stainless steel as standard (SUS316L available for corrosive applications)
• Screw Speed: 2-5 rpm, adjustable via VFD

6. DAGYEE Screw Press Core Advantages

Advantage	Description
No Clogging	Moving and fixed rings create self-cleaning action, ideal for oily and fibrous sludge
Low Energy	Only 2-5 rpm, consumes 1/3 the energy of belt presses, 1/5 of centrifuges
Automatic Operation	PLC control with programmable cycles, unattended operation
Compact Footprint	Only half the space of a belt press — perfect for retrofits
Low Wash Water	Only 24-216 liters per hour — 1/50 of a belt press
Wide Application	Handles low-concentration sludge down to 2000mg/L, no thickening tank needed
No Filter Cloth	No replacement costs, no downtime for cloth changes
Low Maintenance	Only annual gearbox oil change and occasional ring inspection
Long Service Life	SUS304 stainless steel, corrosion-resistant, designed for 10+ years
Safe Operation	Low speed (2-5 rpm), no pinch points, quiet (<65 dB)

7. What Customers Say About DAGYEE Screw Press

*"We replaced our old belt press with a DAGYEE screw press. Our electricity bill dropped by 40%, and we no longer spend hours cleaning filter cloths. The machine runs 24/7 with almost no attention."*
— Plant Manager, Food Processing Plant

"The self-cleaning design is a game-changer. Our previous equipment would clog every time we got fibrous material. The DAGYEE screw press just keeps running."
— Operations Supervisor, Paper Mill

*"We were out of space — literally no room to expand. The DAGYEE screw press fit into our existing building and handled the same sludge volume as our old belt press in 1/10 the footprint."*
— Facilities Engineer, Municipal WWTP

"What I appreciate most is the support. When we had questions during startup, their engineer walked us through it on the phone. They didn't just sell us a box and disappear."
— Maintenance Manager, Slaughterhouse

8. Real-World Results: Before and After

A food processing plant had been using a belt filter press for years. They were frustrated with constant clogging, high water bills, and the time their operators spent cleaning filter cloths.

9. When to Choose DAGYEE Screw Press

Situation	Why DAGYEE Screw Press
You're short on space	80-90% smaller footprint than belt presses
You have oily or fibrous sludge	Self-cleaning design handles what clogs others
Water is expensive or scarce	Uses 1/50 the wash water of a belt press
You want to reduce labor costs	PLC automatic control, runs unattended
You're retrofitting an old plant	Compact design fits into existing buildings
You process low-concentration sludge	Handles down to 2000mg/L, no thickening tank needed
You want the lowest total cost of ownership	Lower energy, no filter cloths, less maintenance, less labor

10. One Sentence Summary

Your Situation	Recommended Equipment
Oily or fibrous sludge	DAGYEE Screw Press
Tight on space, want to reduce labor	DAGYEE Screw Press
Need cake moisture below 70%	Plate & Frame Press
High volume, plenty of space, cheap labor	Belt Filter Press
New project, pursue long-term low operating costs	DAGYEE Screw Press

There's no perfect equipment — only equipment that fits your needs. Understand your conditions, calculate the numbers, and the choice becomes clear.
Not sure which one is right for you?
DAGYEE offers free technical consultation. Tell us your sludge type, treatment volume, and site conditions, and we'll help you make the right choice.
We can also:
• Run lab tests on your sludge sample
• Provide a detailed cost comparison for your specific case
• Arrange a factory visit to see our equipment in action

Note: Data in the comparison table are typical values for reference. Final selection should be confirmed with technical staff.