AS-H Plate Press

The best technology to achieve exceptional cake dry solids and the highest solids capture rate of any dewatering solution.

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Superior dewatering performance

  • Batch dewatering technology with the driest cake vs. other methods
  • Available with fully automated plate separator
  • Robust sidebar frame design
  • Available with an inflatable membrane plate to achieve the highest dry solids
  • A number of safety features incorporated to protect operators
The Alfa Laval AS-H plate filter press is suitable for municipal biosolids sludge, water plant residuals, or industrial process and wastewater dewatering applications where a batch process is desired for the operation. Dry solids can be up to 40% dry solids on municipal / environmental applications and up to 90% or higher on some industrial applications with a solids capture typically > 99%. Polymer and power usage is also low and the Alfa Laval AS-H Plate filter press is available in a variety of configurations customized to your dewatering needs.

How it works


A plate press is a series of filter plates which are pressed together by hydraulic cylinders. The filter plates form a cavity or chamber where the filter cake (solid) will form.  The plates are clamped together under pressure from a hydraulic system.

The chambers of the plate press are gradually filled up with slurry via a feed pump. Under continuous and increasing feed pressure, cakes are formed from the outside inwards in the plate chambers. Eventually the slurry cannot be pumped in because filter cake occupies all of the spaces in between the chambers as the solid levels build up and the liquid drains from the press. At this point the filter plates are separated either by mechanical or manual means, usually one at a time, allowing the high solids filter cake to be discharged.

Meeting your exact requirements

 A selection of features and variety of sizes and configurations are available for the AS-H Plate Press:

  • Range includes manual, semi-automated, or fully automated plate press operation
  • Several plate sizes ranging from 300 x 300 millimeters up to 2 x 2 meters
  • Cake washing is available to displace soluble components in the cake
  • Air blowing of the cake is available to further remove moisture
  • Manual drip trays available for smaller sized presses

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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.)

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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