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Sewage sludge drying


 GEFA valve solutions for dewatered sewage sludge

Sewage sludge is a waste product of wastewater disposal, it consists of organic, mineral as well as water-based substances present in dissolved and solid form. To meet the highest requirements of the industry, we offer our modern DOMINO high pressure gate valves SD3 (AT300) and SD75 (AT750). With precise technology and reliable performance, ensure that your operation runs smoothly at all times.


DOMINO SD3 (AT300) / SD75 (AT750) - Specialists for special applications

Their main application is in piping systems for conveying mechanically dewatered sewage sludge or biomasses with high dry substance contents. Even materials with dry matter contents of up to 50% are nowadays conveyed in piping systems with the aid of pistons, screw pumps or eccentric pumps. Due to the long pipelines and geodetic height conditions in the plants, delivery pressures of 20 to 50 bar are generated, in some applications even higher. Pipelines and especially the valve technology used must be able to adapt and withstand the extreme requirements.


In these areas, the GEFA knife gate valves of the AT300 series, which can be used at pump pressures up to max. 40 bar, have proven their worth for years. Applications include chamber filter presses or centrifuges for sewage sludge drying, storage and loading of dewatered sewage sludge or in piping systems in fermentation and biogas plants.

For the higher requirements, GEFA Processtechnik GmbH has added the AT750 series to its product range. This covers applications with operating pressures up to 100 bar. In a sewage treatment plant in southern Germany, for example, ball valves that became sluggish after a few operations due to deposits of the medium in the dead spaces and had to be removed for inspection were successfully replaced by this gate valve.

SD3 (AT300) - DOMINO-High pressure gate valve PN25
Lug type knife gate valve for  installation between flanges acc. to  EN 1092-1 / PN 10-PN 40. For dewatered sewage sludge or biomass.
Face-to-face dimension: DIN EN 558 line 16
Body: EN GJS-400-15 (GGG40)
Plate Stainless steel: 1.4301
Sealings: NBR (EPDM, FPM)
Sizes: DN 100 - DN 300

SD75 (AT750) - DOMINO-High pressure gate valve PN100
Lug type knife gate valve for installation between flanges acc. to EN 1092-1/ PN 2.5-PN 100. For dewatered sewage sludge or biomass with through-going slide plate.
Body: Steel/Stainless Steel
Plate: Stainless steel
Sealings: NBR or EPDM, etc.
Sizes: DN 50 - DN 500


Application of the DOMINO high pressure gate valve in wastewater treatment plants

Installation of DOMINO high pressure gate valves AT750 DN150 PN100 as a replacement for the previously installed ball valves, which blocked after a few operations due to storage of medium in the dead spaces.

Medium: dewatered sewage sludge, 24-28% dry matter content
Operating pressure: max. 50 bar
Operating temperature: 20°C
Switching frequency: 10/year (switching without pressure)
Actuation: E-drive Auma, rising spindle.

++ More information about the application example ++


Download here our sewage sludge flyer

              Product Information - Klärschlammprospekt AT750/300 (GB) (2.46 MB)


If you are looking for an optimally matched valve for your sewage sludge application, please feel free to contact our team of experts - our specialists will be happy to advise you!

Dirk Pollak

Dirk Pollak

Product Manager
Knife Gate Valves

+49 231 61009-355
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