Description

DAGYEE Screw Press Sludge Dewatering Equipment

1.Product Overview

The DAGYEE Belt filter press is a high-capacity, continuous-operation dewatering solution designed for large municipal and industrial wastewater treatment facilities. This proven technology utilizes two tensioned filter belts to sandwich and compress sludge through a series of rollers, achieving high throughput with reliable performance. The belt filter press is ideal for facilities with sludge flows exceeding 100-200 m³/day, offering the lowest capital cost per unit capacity among dewatering technologies. With capacities ranging from 5 to 100+ m³/hour, the DAGYEE belt press delivers consistent cake dryness with minimal operator attention.

2. Working Principle

The belt filter press operates through a four-stage dewatering process:

1. Gravity Dewatering Zone: Flocculated sludge is evenly distributed across the upper filter belt using a specially designed distribution system. As the belt moves horizontally, free water drains through the belt by gravity, reducing sludge volume by approximately 50-70%. A series of plows or rollers gently agitate the sludge to promote drainage.

2. Wedge Pre-Pressure Zone: The sludge enters a wedge-shaped gap where the upper and lower belts gradually converge. This slow pressure increase allows water to continue draining while gradually compressing the sludge, preparing it for the high-pressure section without creating sudden pressure shocks.

3. High-Pressure Dewatering Zone (S-Roll Section): The sludge, now sandwiched between two belts, passes through a series of rollers arranged in an S-shaped path. Each successive roller has a smaller diameter, increasing pressure and shear. The belts are tensioned to create up to 5-8 kg/cm² of pressure, squeezing water from the sludge. The S-roll design ensures that pressure is applied gradually to prevent sludge extrusion from the sides of the belts.

4. Cake Discharge and Belt Cleaning: Dewatered sludge cake is scraped off the belts by doctor blades at the discharge end. The belts are then continuously cleaned with high-pressure water sprays (typically 5-8 bar) to remove residual sludge, ensuring consistent filtration performance. Belt tracking systems automatically adjust belt alignment to prevent wandering.

3. Key Advantages

• High Throughput Capacity – Processes up to 100+ m³/hour of flocculated sludge

• Continuous 24/7 Operation – Designed for heavy-duty, round-the-clock use

• Three-Net Design (Optional) – Enhanced dewatering with three filter belts (top, bottom, and middle)

• Automatic Belt Tracking – Air-operated or mechanical belt tracking prevents misalignment

• Variable Belt Speed – Allows adjustment for different sludge types and throughput requirements

• High-Pressure Cleaning System – Water spray bars with stainless steel nozzles

• Heavy-Duty Roller Construction – Wear-resistant stainless steel rollers with sealed bearings

• Centralized Grease Lubrication – Reduces maintenance time on multiple bearings

4. Technical Specifications

Standard models are listed below. Custom configurations are available upon request.

• Lowest capital cost per m³/hour of capacity among dewatering technologies

• Handles fluctuating flow rates without significant performance loss

• Simple, robust design with minimal electronics (easier maintenance)

• Long belt life with proper operation and cleaning (typically 1-2 years)

• Suitable for both municipal and industrial applications

• Can be installed outdoors with weather protection or indoors

• Low polymer consumption relative to centrifuge (similar to screw press)

• Capable of producing cake dryness of 20-30% DS

Model	DS Capacity (kg/h)		Sludge Capacity (m³/h)			Power (kW)	Dimensions (mm)			Operating Weight (kg)
	Min	Max	2g/L	10g/L	20g/L		L	W	H
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

Note: Capacity and cake dryness depend on sludge characteristics, polymer type, and dosage. A sludge test is recommended for accurate sizing.

Materials:

• Screw and rings – Stainless 304 (316L available for corrosive stuff)

• Housing – Stainless 304

• Frame – Carbon steel with epoxy coating

Cake solids: 15% to 30% depending on your sludge and chemical

Temperature range: 0°C to 60°C

Voltage: We match yours – 380V/50Hz, 460V/60Hz, or others

5. Comparison with Traditional Equipment

Each technology has appropriate applications. The selection depends on specific site requirements including sludge characteristics, available labor, energy costs, and budget constraints.

What this means for you:

• Want the driest cake possible? Get a centrifuge. But budget for power and repairs.

• Have almost no budget upfront? Get a belt press. But plan for labor and water.

• Want the lowest total cost and least headache? Get our screw press.

6. Selection & Maintenance

Selection Worksheet

To select the appropriate model, calculate your dry solids production rate.

Step 1: Measure or estimate your sludge flow rate in cubic meters per hour.

Step 2: Measure your inlet solids concentration in percent or grams per liter. One percent solids equals ten grams per liter.

Step 3: Calculate dry solids per hour: Flow rate × Solids concentration × 10 (for grams per liter to kilograms per hour).

Step 4: Multiply by 1.5 to provide margin for variations.

Step 5: Select a model with dry solids capacity exceeding this number.

Example Calculation

Sludge flow: 8 cubic meters per hour
Inlet solids: 2 percent (20 grams per liter)
Dry solids: 8 × 20 = 160 kilograms per hour
With margin: 160 × 1.5 = 240 kilograms per hour
Recommended model: DAG-301 or DAG-302 depending on flow characteristics

Free Laboratory Testing

DAGYEE maintains a pilot-scale test unit for customer sludge samples. The test procedure requires approximately five liters of representative sludge.

The test report includes:

• Achievable cake solids content

• Recommended polymer type and dosage

• Filtrate quality measurements

• Recommended model based on test results

There is no charge for this service. Shipping costs for the sample are the responsibility of the customer.

Maintenance Planning

The maintenance program for this equipment is substantially simpler than for belt presses or centrifuges.

Daily Tasks (Five Minutes)

• Visual check for any external leaks

• Listen for changes in operating sound

• Verify control panel shows normal status

Monthly Tasks (Thirty Minutes)

• Check gearbox oil level through sight glass

• Apply grease to motor bearings if equipped with fittings

• Inspect discharge area for abnormal buildup

Quarterly Tasks (One Hour)

• Check all accessible fasteners for tightness

• Clean any debris from around the machine

• Verify wash system operation

Annual Tasks (Two to Four Hours)

• Drain and replace gearbox oil

• Remove and inspect a sample of rings for wear measurement

• Check shaft seals for signs of leakage

• Inspect electrical connections in control panel

Applications

• Large municipal wastewater treatment plants (>50,000 PE)

• Regional sludge treatment centers

• Industrial parks and manufacturing clusters

• Pulp and paper mills with high fiber loading

• Food processing facilities with high organic loading

• Mining and mineral processing (tailings thickening)

• Dredging and river clean-up projects

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