Alfa Laval ALDEC G3 decanter centrifuges are the latest generation of sludge dewatering equipment for municipal and industrial water and wastewater treatment plants, designed to set a significantly higher standard for both process performance and environmental impact.

ALDEC G3 sludge dewatering centrifuge

Ground-breaking decanter centrifuge setting new heights for performance:

  • Lower power consumption (which also greatly reduces CO2 emissions)
  • 10% boost in processing capacity – or drier cake
  • Reductions in life cycle costs
  • More efficient biosolids and residuals handling
  • Better process monitoring and control
The ALDEC G3 advanced range of sludge decanter centrifuges is ideal for municipal and industrial water and wastewater thickening and dewatering applications. The innovative design delivers peak performance at all times, while also reducing total power consumption by as much as up to 40%. This significant improvement results in big reductions in CO2 emissions, meaning less impact to the environment.

A set of innovative parameters

Alfa Laval's unparalleled decanter centrifuge technology has paved the way for a series of ground-breaking innovations, all based on proven technology renowned for reliability. Together, these ensure a unique combination of better performance and lower energy consumption, resulting in lower operating costs than ever before.

The ALDEC G3 decanter is built around the Slimline design – a breakthrough in decanter centrifuge performance and capabilities. The smaller conveyor diameter makes room for more liquid in the pond, and allows higher bowl wall pressures, resulting in either drier cake or using less polymer.

Sludge dewatering centrifuge - feature highlights

  • Power plates/tubes and slimline conveyor design
  • Critical components made of wear-resistant material
  • Fully open feed zone for improved separation 360° solids discharge to avoid blocking
  • Baffle disc provides higher capacity and drier cake solids
  • Steep or shallow cone configuration for effective separation of any type of slurry
  • Selection of conveyor designs available for use with different types of slurry
  • Different forms of wear protection for conveyor flights, to suit any processing requirements
  • Complete, fully enclosed cleaning-in-place (CIP)

How it works


Separation takes place in a horizontal cylindrical bowl equipped with a screw conveyor. The feed enters the bowl through a stationary inlet tube and is accelerated smoothly by an inlet distributor. The centrifugal force that results from the rotation then causes sedimentation of the solids on the wall of the bowl.

The conveyor rotates in the same direction as the bowl, but slightly slower, thus moving the solids towards the conical end of the bowl. The cake leaves the bowl through the solids discharge openings into the casing. Separation takes place throughout the entire length of the cylindrical part of the bowl, and the clarified liquid leaves the bowl by flowing over power tubes into the casing.

For further details, please view our product leaflet

New performance parameters

The special Slimline design significantly increases the volume available inside the bowl. This unique set-up boosts processing capacity at the same time as ensuring the most efficient performance. The combination of the deep pond and the smaller discharge radius saves as much as 20% on your power costs, because less energy is lost when the bowl rotates.

Power plates / tubes

The kinetic energy in the liquid that leaves the decanter is proportionate to the square of the velocity. The patented Power Plates / tubes in the ALDEC G3 design make it possible to capture some of this kinetic energy from the liquid discharge, transferring it in the opposite direction of the bowl rotation. This reduces the total effluent velocity, which means less energy is needed to achieve any given effluent flow specifications. 

Available VecFlowTM feed zone

The available VecFlow™ feed zone offers unmatched efficiency for thickening and dewatering of wastewater sludge. The unique VecFlow™ feed zone minimizes turbulence, resulting in exceptional separation and up to 30% lower power consumption compared to traditional decanters. 

The benefits for you

Your power consumption will decrease, which in turn will save you money and bring you closer to meeting environmental regulations.

Decanter Connect control package

ALDEC G3 decanter centrifuges are equipped with the Decanter Connect control package as standard. This makes it easy to fine-tune and improve productivity throughout the service life of each ALDEC G3 unit.

Taking your ALDEC G3 decanter to the next level

Consider upgrading with an ALDEC G3 VecFlow™ conveyor

Vecflow sludge decanter centrifuge

Stay connected - Imagine the possibilities if you could have an eagle eye’s view of your equipment


Ensuring that customers get outstanding and reliable performance from their equipment throughout its long lifetime is our top priority. That’s why we’re investing heavily in R&D for IoT (internet of things) services to interconnect your production and control systems. You'll have vital information at your fingertips to truly get the most from your equipment – each and every day.

This suite of connectivity solutions provides highly valuable insights to help increase efficiency and reliability, boost uptime and reduce maintenance costs.

  • Remote support and monitoring - Provides valuable advice on maintenance, service planning, process optimization and troubleshooting
  • Cost calculator - Real-time calculation of your operating cost based on live operating data and factors such as the price for polymer and power
  • Condition monitoring with ConditionAlert TM - Identifies early-stage defects in your decanter centrifuge and gives you a warning along with a service recommendation well before major problems arise
  • Constant Solids Load and Adaptive Polymer Control - Reduce operating cost by optimizing the dosing of flocculants

Learn more


Case stories

You may also be interested in:

A well-run predictive maintenance plan will help you correct small service issues well before they turn into major problems. This can save you time, money, and the stress of an unplanned shutdown. Learn how to make the change in this on demand webinar.

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Performance audit for Decanter Centrifuges

Get decanter centrifuge optimization and cost-savings with an Alfa Laval Performance Audit as our global service and support experts help make the most out of your equipment.

Solutions for the Circular Economy

More and more wastewater treatment plants are discovering the benefits of a circular, holistic approach to wastewater treatment. Cost savings, reduced environmental impact and new income streams from recovered resources are but a few. Every wastewater treatment plant is unique and has its own set of challenges and opportunities. With our expertise in processing and our broad range of products, we can support your shift to a circular resource flow. Regardless of whether you are a contractor, designer or plant operator we can help you find the optimum solution for your specific project.

Related product:


ALDEC decanter centrifuges for economical, high-performance sludge thickening and dewatering.

ALDEC decanter front 640x360

How can we help?

With industry-leading wastewater technology and expertise based on the experience from thousands of installations, we can help analyze your unique situation and select the optimal equipment model, configuration and services for your needs and budget. Get in touch by reaching out directly to the local contact for your area or submitting a general inquiry on the contact form. 

Request a quote

Submit your process information to receive an estimated price range for this application.  (Please note that this will be a budget estimate only. A firm quotation will require more detailed process parameters.)

Submit a budget quote request


Local contacts

Chuck Shaw
Regional Sales Manager – Water Separation Sales – Midwest
Phone: (317) 345-5512
Coverage area:  IA, IL, IN, KS, KY, MI, MN, MO, ND, NE, OH, SD, TN, WI


Jose Carpio
Director of Sales – Water & Wastewater
Phone: (804) 852-9340
Coverage Area: CT, DE, MA, MD, ME, NH, NJ, NY, PA, RI, VT, WV


Roger McKinney
Regional Sales Manager – Water Separation Sales – Northwest
Phone: (559) 317-8551
Coverage area: WA, OR, ID, MT, WY, CO, NM


Marc Arquit
Regional Sales Manager – Water Separation Sales – South
Phone: (713) 882-1286
Coverage area:  AR, LA, MS, TX, OK

Mark Schlitzkus
Regional Sales Manager – Water Separation Sales – Southeast
Phone: (713) 906-0505
Coverage area:  AL, DC, FL, GA, NC, SC, VA


Marc Perratore
Regional Sales Manager – Water Separation Sales – Southwest
Phone: (201) 388-8393
Coverage area: CA, NV, AZ, UT


Contact our team

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