Alfa Laval ALDEC decanter centrifuges are designed for the sludge thickening and dewatering process in municipal and industrial water and wastewater treatment plants, with a focus on cost-efficiency, reliability, easy operation and sustainability.

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Decanter centrifuge design provides a series of concrete benefits

  • Reduces sludge volume, which cuts down on transport and disposal costs
  • High capacity at small footprint: Compact, modular design saves space
  • High performance combined with low energy consumption
  • Wear-resistant design with 360 degree solids discharge feature
  • Complete, fully enclosed cleaning-in-place (CIP)
The extensive range of ALDEC sludge centrifuges are capable of handling a wide range of flow rates. They are designed to be efficient, simple to install, easy to maintain and straightforward to operate. Installation, operating and service life costs are minimal. Ideal for municipal or industrial water and wastewater thickening and dewatering.
Cost effective sludge decanter centrifuges

Less water, lower cost

Decanter centrifuges are crucial for removing the water content of sludge from municipal water (residuals) and of wastewater (biosolids) plants, as well as from industrial waste streams. The drier the sludge, the less space it takes up and the less it weighs – both resulting in big savings on transport and disposal costs, while also helping to meet sustainability and environmental goals.  

Low energy consumption and labor costs

With ALDEC decanter centrifuges, you benefit from low energy consumption and infrequent maintenance costs, keeping sludge thickening and dewatering expenses to a minimum. They are also fully automatic, so you need less labor to operate a centrifuge verses other dewatering technologies.

How it works

ALDEC decanter centrifuges separate the liquid components from a stream of feed solids in a rotating horizontal cylinder (the bowl) fitted with a screw conveyor inside. The feed enters the bowl through a stationary inlet tube and is accelerated smoothly by the feed zone. This gives rise to a centrifugal force that makes the separated-out solids collect on the wall of the bowl.

The conveyor and the bowl rotate in the same direction, but at different speeds. This has the effect of moving the wastewater solids towards the conical end of the bowl, where they can be removed. The liquid components in the sludge leave the bowl by flowing over adjustable plate dams into the casing.

This technology – in which Alfa Laval is the world leader – results in exceptionally effective dewatering and thickening, with optimum performance.

For further details, please visit view our product brochure.


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 story

Reducing biosolids disposal costs with a decanter centrifuge

A southern California dairy plant reached their cost savings and sustainability goals after selecting a decanter centrifuge and maintenance monitoring plan from Alfa Laval.

Hollandia decanter 64x360

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.

Webinar on demand 640x360 (1)

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 G3

ALDEC decanter centrifuges are available with capacities ranging from 10 to 1000 GPM. For higher capacities and more advanced features, and where energy savings is a key criteria for your water or wastewater treatment process, Aldec G3 is your ideal solution.

ALDEC G3 sludge dewatering centrifuge

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.)

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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


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