ALDEC G2

Smart Decanter

Shifting the benchmarksThe innovative Alfa Laval ALDEC G2 decanter centrifugedesign has shifted the accepted benchmarks for dewateringperformance, providing an improvement of as much as 30%compared with previous generations of decanter centrifuges.

This complete range features a compact, modular designwith all critical parts made of wear-resistant materials. Theresult is reliable, continuous operation and easy, trouble-freeprocess control.

Easy to operate, easy to get resultsThe outstanding features of the ALDEC G2 design make iteasy to accomplish a wide range of performance targets.

• More sludge treated, more efficiently• Greater processing capacity for any given equipment footprint• Better process control• High level of protection against erosion• Low maintenance costs• Low energy consumption• Low life cycle costs• Major savings on sludge disposal• Fast and easy mechanical and electrical installation andcommissioning.

Enhancement packagesIn some cases, the economics of sludge treatment operationcan require the addition of one or more special Alfa Lavalenhancement packages. You can select between:• enhanced dewatering package – achieve even greater cakedryness and lower sludge disposal costs.

• enhanced wear protection package – maintenance costscan be reduced still further by selecting more wear resistantmaterials. This in turn extends service intervals.

• enhanced serviceability package – features that save youtime by making both operation and maintenance easier.

• enhanced control packages – add-on control systems thatprovide additional functionality and varying degrees ofautomation.

Flow rate

G-level

Cak

eco

ncen

trat

ion

G2 designCurrent technology

Fig. 1 Shifting dewatering performance parameters, all round.

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Working principleSeparation takes place in a horizontal cylindrical bowlequipped with a screw conveyor. The feed enters the bowlthrough a stationary inlet tube and is accelerated smoothly byan inlet rotor. Centrifugal forces cause sedimentation of thesolids on the wall of the bowl. The conveyor rotates in thesame direction as the bowl, but at a different speed, thusmoving the solids towards the conical end of the bowl.

The ALDEC G2 design enables the hydraulic pressure insidethe bowl to enhance scrolling through a narrow opening. Thismeans that only the very driest fraction of the sludge cakeleaves the bowl through the solids discharge openings intothe casing. Separation takes place along the total length ofthe cylindrical part of the bowl, and the clarified liquid leavesthe bowl by flowing over adjustable plate dams into the cas-ing.

Process optimizationThe ALDEC G2 decanter centrifuge can be adjusted to suitspecific requirements by varying• the bowl speed to ensure the exact G force required for themost efficient separation.

• the conveying speed for the best possible balance betweenliquid clarity and solids dryness.

• the pond depth in the bowl for the best possible balancebetween liquid clarity and solids dryness.

• the feed rate – the ALDEC G2 is designed to handle a widerange of flow rates.

DesignAlfa Laval designed the ALDEC G2 decanter centrifuge with afocus on performance, easy access, reliability and low noiselevels. The rotating assembly is supported on a compactwelded box beam frame with main bearings at both ends.The in-line main motor is flange- or foot mounted onto theunit with adjustable brackets for belt tension adjustment. Thebowl is driven at the conical end by an electric motor with aV-belt transmission.The bowl, conveyor, casing, inlet tube, outlets and other partsin contact with the process media are made of AISI 316 andduplex stainless steel.

Direct driveThe drive system that is an integral part of the ALDEC G2design was specially developed by Alfa Laval to make it pos-sible to control the conveying speed automatically. Thisensures the best possible balance between liquid clarity andsolids dryness, irrespective of any variations in the feed flowthat may occur.

The Direct Drive system comprises an exceptionally efficientgearbox and variable frequency drive, which together avoidexposing the bowl drive to parasitic braking power. It alsosimplifies the electrical installation and keeps power con-sumption and CO2 emissions to the absolute minimum.In addition, the Direct Drive is capable of accurate controlwithin the complete range of differentials, with no need forchanging belts or pulleys.

2Touch controls packageEach ALDEC G2 decanter centrifuge is equipped with a2Touch control package as standard, pre-installed andfactory-tested.

The combination of 2Touch control systems and ALDEC G2separation technology makes sure you get the most out ofany ALDEC G2 installation, at the same time as keepingcosts for installation, commissioning, operation and mainte-nance to a minimum.

Additional enhancement packages are available for the2Touch controls package. These include:• Maintenance and training aids, including access to manualsin PDF format and videos about routine maintenanceprocedures.

• Process module for constant polymer control and dosingoptimization.

• Octopus, an automatic device management system forsludge dewatering processes. This system is designed toensure continuous optimization of the dewatering process,aiming for the lowest possible operating cost.

• Protection against power loss, thus ensuring safe, uninter-rupted operation, regardless of power dips or outages.

• Service packages for remote monitoring, response andreporting.

• The COSMOS predictive maintenance system for in-depthanalysis of maintenance needs, designed to prevent majorunplanned downtime.

DD GearboxLiquid

Screw conveyor

Wall of the bowl

Inlet distributor

Conical end

Discharge port

Feed tube

Feed

Solids

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Dimensions

ALDEC G2-95 5462 mm (215 inch)

ALDEC G2-115 6450 mm (254 inch)

ALDEC G2-125 6900 mm (272 inch)

1150 mm (46 inch)

1450 mm (58 inch)

1510 mm (60 inch)

ALDEC G2-60 4550 mm (180 inch)

ALDEC G2-70 5000 mm (197 inch)

ALDEC G2-100 5940 mm (234 inch)

1110 mm (44 inch)

1110 mm (44 inch)

1300 mm (51 inch)

ALDEC G2-45 4273 mm (168 inch) 990 mm (39 inch)

Max

.130

4mm

(51i

nch)

Max

.126

8mm

(50i

nch)

Max

.185

0mm

(73i

nch)

ALDEC G2-130 7465 mm (295 inch)

ALDEC G2-140 7740 mm (306 inch)

3365 mm (133 inch)

3795 mm (150 inch)

Max.1973mm(78inch).

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How to contact Alfa LavalUp-to-date Alfa Laval contact details forall countries are always available on ourwebsite at www.alfalaval.com

PEE00027EN 0910 Alfa Laval reserves the right to change specifications without prior notification.

Designation Max. Weight Bowl Other product and Typical Main Typical Back Back drivekg (lbs) Material liquid wetted parts drive Size kW (HP) drive Size kW (HP) control

ALDEC G2-45 2300 (5071) duplex stainless steel AISI 316 11-37 (15-50) 5.5/11 (7.5/15) VFDALDEC G2-60 3500 (7800) AISI 316 AISI 316 18.5-37 (25-50) 7.5 (10) VFDALDEC G2-70 3900 (8600) AISI 316 AISI 316 22-37 (30-50) 7.5 (10) VFDALDEC G2-95 4500 (9900) duplex stainless steel AISI 316 45-90 (60-125) 11/22 (15/30) VFDALDEC G2-100 7000 (15400) duplex stainless steel AISI 316 37-75 (50-100) 7.5/11 (10/15) VFDALDEC G2-115 6500 (14300) duplex stainless steel AISI 316 75-160 (100-200) 7.7/30 (20/40) VFDALDEC G2-125 8600 (18959) duplex stainless steel AISI 316 110-250 (150-300) 22/37 (30/50) VFDALDEC G2-130 13730 (30200) duplex stainless steel AISI 316 225 (300) 22 (30) VFDALDEC G2-140 18070 (39750) duplex stainless steel AISI 316 450 (600) 55 (75) VFD

Technical Data

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