ALDRUM | Alfa Laval


The Alfa Laval ALDRUM system is ideal for thickening of municipal or industrial sludge prior to digestion or dewatering, and for reducing sludge volume prior to storage or transportation.

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Compact, robust and efficient

  • Long-lasting filter cloth
  • Intermittent flushing saves water
  • Gentle treatment of flocculated sludge feed saves polymer and gives high recovery
  • Safe design with bolted, hinged cover
  • Clean, enclosed, low-odor solution

Alfa Laval ALDRUM rotary drum thickeners are designed for small to medium capacity municipal or industrial sludge thickening. Installation couldn’t be simpler – just bolt it in place and connect the external power and piping. This well-proven solution is known for its robust, straightforward design, making the ALDRUM drum thickener a reliable and user-friendly product. You benefit from low water consumption as the drum is cleaned intermittently using either potable water, final effluent or treated filtrate.

How it works


The ALDRUM drum thickener works on the principle of conveying polyelectrolyte treated sludge (a.k.a. flocculated sludge) through a slowly rotating drum filter. The sludge remains in the drum, while the water phase passes through the filter cloth.

The ALDRUM can be adjusted to suit individual sludge thickening needs. It is possible to achieve the most efficient thickening by varying the feed rate, the polymer type and dosage, the drum speed, and the spraying interval. The most cost-effective flocculation and polymer dosage is achieved by installing a flocculation reactor and/or mixing valve upstream of the actual drum thickener.

The ALDRUM can be used in industrial (such as pulp and paper) or municipal wastewater sludge thickening applications prior to digestion or dewatering, and for reducing sludge volume prior to storage or transportation.

Meeting your exact requirements

A selection of auxiliary equipment is available for the complete ALDRUM range:

  • Mixing valve: Ensures thorough mixing of polymer and sludge. Can be installed directly on to the drum thickener inlet or before the flocculation reactor
  • Flocculation reactor: Simple open reactor that kick-starts the creation of large and strong flocks. Can be installed directly onto the drum thickener inlet
  • Sludge hopper: Leads the thickened sludge to the sludge pump in a controlled and efficient manner
  • Control panel: All-in-one control solution. Control of the plant’s feed pump, sludge pump and polymer pump, as well as the drum thickener, the level in the flocculation reactor and the sludge hopper

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Lab and pilot testing for municipal and industrial water and wastewater

Alfa Laval has a full testing lab to determine the best solution for achieving the sludge thickening and dewatering results you need. Pilot testing also available.

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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.


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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