Description

High Speed Decanter Centrifuge Sludge Dewatering Machine For Municipal And Industrial Sewage Treatment

1.Product Overview

The DAGYEE High-Speed Decanter Centrifuge is a powerful, high-performance dewatering solution designed for applications requiring maximum solids capture and the driest possible cake. Utilizing high centrifugal force (up to 3000 G), this machine achieves exceptional separation efficiency, making it the preferred choice for municipal sewage treatment plants, large industrial facilities, and operations where cake dryness and solids recovery are critical performance metrics.

2. Working Principle

The decanter centrifuge operates on the principle of accelerated sedimentation. A horizontal bowl rotates at high speed, generating centrifugal force thousands of times greater than gravity:

1. High-Speed Rotation: The stainless steel bowl spins at speeds up to 4000 RPM, generating centrifugal forces up to 3000 G. This massive force drives solids to the bowl wall at a rate millions of times faster than gravity settling.

2. Continuous Solids Conveying: A screw conveyor (scroll) rotates within the bowl at a slightly different speed (differential speed). This relative motion continuously conveys separated solids toward the conical discharge end, where they exit the machine.

3. Liquid Discharge: The clarified liquid (centrate) overflows from the opposite end of the bowl through adjustable weir plates, providing the desired liquid clarity and pool depth.

4. Differential Speed Control: The difference between bowl and scroll speeds is precisely controlled via a gearbox or variable frequency drive, allowing optimization for different sludge types and dewatering requirements.

3. Key Advantages

• High G-Force – Up to 3000 G for maximum solids recovery and cake dryness

• Continuous Operation – 24/7 automatic operation with minimal supervision

• Adjustable Weir Plates – Allows optimization of pool depth for different sludge characteristics

• VFD Control – Variable frequency drives on both bowl and scroll for maximum process flexibility

• Wear Protection – Tungsten carbide or ceramic tiles on critical wear areas

• Dual Drive System – Independent bowl and scroll speed control

• Vibration Monitoring – Early warning system for imbalance or bearing wear

4. Technical Specifications

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

• Achieves the driest cake among all dewatering technologies (20-35% DS)

• Highest solids recovery rate (95-99% capture)

• Handles the widest range of sludge concentrations and types

• Suitable for both thickening and dewatering applications

• Compact footprint relative to belt presses (similar floor space but higher capacity)

• Enclosed, odorless operation for improved working environment

• Simple operation once set up; stable performance with consistent sludge feed

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

• Large municipal sewage treatment plants (>100,000 PE)

• Industrial wastewater treatment (paper, chemical, petrochemical)

• Sludge thickening (WAS thickening before digestion)

• Sludge dewatering (final dewatering before disposal)

• Mining and mineral processing (tailings dewatering)

• Oil drilling waste treatment (drilling mud recovery)

• Food processing (protein recovery, juice clarification)

• Biogas and fermentation residues

Note: For best results, a stable feed concentration and consistent sludge characteristics are recommended. DAGYEE provides full sizing and selection support based on your specific sludge analysis.

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