Description

Volute Screw Sludge dewatering press

1.Why Choose DAGYEE Screw Press?

Every wastewater treatment facility faces the same question: how to remove water from sludge without removing money from the budget.

Traditional methods have trade-offs that facility managers know all too well.

Belt filtration systems consume large volumes of wash water and require frequent media replacement. The labor cost alone often exceeds the initial equipment price within the first two years.

High-speed centrifugation achieves dry cake but at the cost of high electrical demand and mechanical complexity. Bearing failures and seal replacements are not matters of if, but when.

Plate and frame presses produce very dry cake but operate in batches and demand significant operator time for each cycle.

The DAGYEE spiral extrusion system takes a different path.

Rather than high speed or high pressure, it uses gradual mechanical compression at low rotational speed. Rather than disposable filter media, it uses a durable stainless steel ring stack that cleans itself during operation. Rather than batch processing, it runs continuously without operator intervention.

The result is a dewatering system that addresses the real cost drivers in sludge management: labor, energy, water, and maintenance.

Facilities that have switched to DAGYEE report measurable reductions in all four categories. Some have recovered the equipment cost within the first year through savings alone.

2. Working Principle

The process begins when flocculated sludge enters the thickening zone. The unique ring structure—comprising fixed rings and movable rings—allows water to drain freely while retaining solids. As the screw shaft rotates at a slow speed, the moving rings continuously shift, creating a self-cleaning action that prevents clogging.-

As the sludge moves forward, the screw pitch gradually decreases, and the pressure inside the filter chamber increases. The back-pressure plate at the discharge end further compresses the sludge, squeezing out residual water and producing a dry cake. The entire process is continuous and requires no manual intervention.

3.Technical Advantages

• Low Speed, Low Wear — Screw rotates at 2–4 RPM, extending equipment life

• Minimal Wash Water — Self-cleaning mechanism drastically reduces cleaning water consumption

• Handles Low-Concentration Sludge — Can dewater sludge as dilute as 2000 mg/L without pre-thickening

• Low Polymer Consumption — Efficient flocculation design saves chemical costs

• Space Saving — Compact design reduces plant footprint and construction costs

• Simple Operation — No specialized technical training required for operators

4. Technical Specifications

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

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

7.Applications

• Municipal sewage treatment plants

• Industrial wastewater treatment (chemical, petrochemical)

• Food processing and beverage industry

• Pulp and paper manufacturing

• Leather and textile industries

• Starch and oil processing plants

Key Advantage: The volute screw press solves the technical challenges faced by earlier generation dewatering equipment—clogging, inability to handle low-concentration or oily sludge, high energy consumption, and complex operation—achieving efficient and energy-saving dewatering goals.7

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