Used Alfa Laval Aldec-404 Stainless Steel Solid Bowl Decanter Centrifuge

Manufacturer Information

Alfa Laval is a global manufacturer of industrial separation, heat transfer, and fluid handling equipment. Its ALDEC decanter centrifuge line is associated with continuous solid-liquid separation and sludge dewatering applications, including municipal and industrial wastewater treatment. Alfa Laval decanter systems use centrifugal force and an internal screw conveyor to separate solids from liquids and continuously discharge the separated phases.

Main Product Description

Used Alfa Laval Model Aldec-404 horizontal solid bowl decanter centrifuge with 316 stainless steel product-contact surfaces, designed for continuous solid-liquid separation, sludge dewatering, slurry clarification, solids concentration, and suspended solids recovery from compatible industrial liquid streams. The centrifuge features a maximum bowl operating speed of 4,000 RPM and a 22 kW (approximately 29.5 HP) main drive motor operating on 380 volts, 3-phase, 50 Hz electrical service. An internal 110 mm (4.33") single-lead screw conveyor with welded hardfacing provides wear-resistant solids transport toward a single row of lined cake discharge ports. Moon-style liquid plate dams provide control over liquid discharge level and separation conditions. The drive system includes a 2.5 kNm torque-rated gearbox with a 159:1 reduction ratio and a DC backdrive motor for controlling differential speed between the rotating bowl and screw conveyor. Additional components include a supporting base, casing, and feed pipe. Suitable for consideration in municipal and industrial wastewater treatment, biological sludge dewatering, chemical slurry separation, industrial effluent clarification, food processing wastewater treatment, mineral slurry processing, and other compatible industrial solid-liquid separation applications.

Specifications

• Manufacturer: Alfa Laval

• Model: Aldec-404

• Equipment Type: Horizontal Solid Bowl Decanter Centrifuge

• Condition: Used

• Product-Contact Material: 316 Stainless Steel

• Maximum Bowl Operating Speed: 4,000 RPM

• Main Drive Motor: 22 kW (Approximately 29.5 HP)

• Main Motor Electrical Requirements: 380 Volts, 3-Phase, 50 Hz

• Backdrive System: DC Backdrive Motor

• Backdrive Function: Differential Speed Control

• Gearbox Torque Rating: 2.5 kNm

• Gearbox Reduction Ratio: 159:1

• Internal Conveyor Type: Single-Lead Screw Conveyor

• Conveyor Size: 110 mm (4.33")

• Conveyor Wear Protection: Welded Hardfacing

• Cake Discharge: Single Row of Lined Discharge Ports

• Liquid Discharge: Moon-Style Liquid Plate Dams

• Supporting Base: Included

• Casing: Included

• Feed Pipe: Included

• Primary Function: Continuous Solid-Liquid Separation

Applications

• Municipal wastewater treatment

• Industrial wastewater treatment

• Biological sludge dewatering

• Industrial sludge thickening and dewatering

• Continuous solid-liquid separation

• Chemical slurry separation

• Industrial effluent clarification

• Suspended solids recovery

• Food processing wastewater treatment

• Mineral slurry dewatering

• Pigment processing

• Industrial slurry clarification

• Mechanical dewatering of compatible process materials

Suitable Products and Materials

• Municipal wastewater sludge

• Biological sludge

• Industrial wastewater sludge

• Chemical process slurries

• Industrial effluent streams

• Food processing wastewater

• Mineral processing slurries

• Pigment suspensions

• Specialty chemical slurries

• Industrial liquids containing suspended solids

• Other compatible solid-liquid mixtures

Actual processing performance depends on feed composition, solids concentration, particle characteristics, differential speed, and required separation results.

Frequently Asked Questions (FAQs)

- What is the maximum bowl speed of the Alfa Laval Aldec-404 centrifuge?

• The centrifuge has a stated maximum bowl operating speed of 4,000 RPM.

- What horsepower is the main drive motor?

• The unit is equipped with a 22 kW main drive motor, equivalent to approximately 29.5 HP.

- What is the Alfa Laval Aldec-404 centrifuge used for?

• It is designed for continuous solid-liquid separation, sludge dewatering, slurry clarification, solids concentration, and recovery of suspended solids from compatible liquid streams.

- What material is used for the product-contact surfaces?

• The unit features 316 stainless steel product-contact construction.

- Does this centrifuge include a hardfaced screw conveyor?

• Yes. The unit includes a 110 mm (4.33") single-lead internal screw conveyor with welded hardfacing for increased wear resistance during solids transport.

- What is the purpose of the DC backdrive motor?

• The DC backdrive controls the differential speed between the rotating bowl and internal screw conveyor, helping regulate solids movement and discharge.

- What gearbox is included with this centrifuge?

• The machine is equipped with a gearbox rated at 2.5 kNm of torque with a 159:1 reduction ratio.

- How are separated solids discharged?

• The centrifuge uses a single row of lined cake discharge ports for continuous removal of separated solids.

- How is the liquid discharge controlled?

• The unit includes moon-style liquid plate dams for controlling liquid discharge level and separation conditions.

- What electrical service is required?

• The main drive motor requires 380 volts, 3-phase, 50 Hz electrical service. Electrical requirements for the DC backdrive and associated controls should be confirmed separately.

- Can this centrifuge be used for municipal and industrial wastewater treatment?

• Potential applications include biological sludge dewatering, industrial sludge treatment, effluent clarification, and suspended solids recovery, subject to processing requirements.

- Can this decanter centrifuge process chemical and mineral slurries?

• Potential applications include chemical slurry separation, mineral slurry dewatering, and pigment processing. Suitability depends on the material characteristics and desired separation performance.

- Can Aaron Equipment help determine whether this Alfa Laval centrifuge is suitable for my application?

• Yes. Aaron Equipment can help review available specifications and discuss feed characteristics, solids concentration, throughput requirements, and other separation considerations.

- Can Aaron Equipment help with shipping this decanter centrifuge?

• Yes. Aaron Equipment can assist with freight and shipping coordination, including transportation requirements and available options based on equipment dimensions, weight, location, and destination.

- How can I request pricing or additional information?

• Contact Aaron Equipment to inquire about pricing, availability, additional equipment photographs, and available technical documentation for this Alfa Laval Aldec-404 centrifuge.