AS-H Winklepress

The Alfa Laval AS-H Winklepress is a high performance belt filter press used for dewatering in municipal and industrial wastewater applications. The units use specialized processing zones to achieve consistent cake dryness at high throughput volumes with low energy and polymer requirements.

Winklepress 97 3 640px

Exceptional dewatering performance for maximum cake dryness

  • Ideal for applications where the highest dry solids are required
  • Low polymer requirement, so costs are reduced
  • Long service life design with lifetime rated bearings
  • Easy to upgrade in the field with additional pressure zone rollers
  • Extended pressure profile – ideal for gentle treatment of nutrient rich sludges
When high cake dryness is a priority, the AS-H Winklepress is tried and true in delivering excellent performance. It is a versatile, heavy duty dewatering belt filter press suitable for all municipal biosolids and residual sludge types and a wide variety of industrial solid / liquid separation applications, such as paper, petrochemical, mineral, food processing, pharmaceutical and chemical. The AS-H Winklepress has a number of features and options designed to meet your needs.

How it works


The Alfa Laval AS-H Winklepress belt filter press begins the dewatering process with a variable-orifice, in-line polymer mixer that combines polymer and slurry instantly to facilitate rapid flocculation. The product then begins to drain over an endless, horizontal porous filter belt. The product is then sandwiched by a second filter belt in a unique vertical wedge zone (allowing for improved drainage), before further dewatering by a series of decreasing diameter rollers.  An optional high solids pressure zone can be employed when maximum cake dryness is desired, resulting in a 10-20% dryer cake.

A fully live belt alignment and tensioning system is employed, that is pre-piped and pre-wired, eliminating any need for civil work or additional lines.  The design and drain pan configurations simplify cleanup and allow access to key areas of the machine.

The Winklepress is equipped with lifetime-rated bearings, each protected from contaminates with triple-labyrinth seals and shaft-mounted splash guards.

Available in two models and configurable to your needs

The AS-H Winklepress comes in two models, both produce exceptionally high dry solids cake.  It’s robust design allows for high operating pressure and extended life for components.  It comes in both an open and fully closed design.  The enclosed design reduces odor emissions – allowing for a smaller odor control system and an improved environment for your operators. 












Winklepress Enclosed


Achieve 2% or more additional dry solids from your belt filter press or gravity belt thickener

Orege process.png

When placed ahead of an existing belt filter press or gravity belt thickener, the Orege SLGTM sludge pre-treatment system changes the rheology of your sludge so that it releases water more freely. Its small footprint means it can likely fit in your existing facility. Alfa Laval has an exclusive agreement to supply Orege in greenfield and brownfield applications.

Reduce your sludge management expenses by:

- Increasing final cake dryness by 2% or more and reducing hauling volumes

- Reducing polymer use

- Increasing belt filter press / gravity belt thickener throughput

Learn more about the Orege SLGTM system

You may also be interested in:

10 top tips to keep your AS-H Belt Filter Press performing optimally

Have an Alfa Laval AS-H Belt press? Here are some top tips to help ensure that your equipment continues to perform at peak dewatering performance.

AS-H Belt Press exploded view

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.

lab test 640x360

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.)

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


Ask a question

This information is stored and processed in accordance to our privacy policy.