OSE Decanter: The Centrifuge for Sewage Sludge Thickening Skip to content Language English­ German­ Russian­ Spanish­ Italian­ French­ Chinese­ Polish­ Portuguese­ Search Menu Menu Home Product Lines Decanter OSE Decanter Menu Product Lines Engineered to Win The FW400 Decanter Designed to meet today’s demands and tomorrow’s challenges: The FW400 combines maximum productivity, customizable configuration, and intelligent operation in a high-performance decanter. For greater efficiency, enhanced operational reliability, and sustainable success in your separation processes. Discover the FW400 Decanter Centrifuge Decanter FW400 C-Series X-Series Z-Series OSE Decanter HTS Decanter Decanter Functionality Tricanter® Sedicanter® Sorticanter® Separator 2 Phase Separator 3 Phase Separator Nozzle Separator Belt Press Engineered Systems Mobile Dewatering Plants Rental Machines Fields of Application Biogas Plants and Digestate Processing Recover Valuable Nutrients While Reducing Costs. With the help of intelligent separation technology, digested sludge is converted into valuable raw materials. Flottweg decanter enable the efficient processing of digested sludge, reduce transportation costs, and support the recovery of nutrients—for a future-proof circular economy. 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Greater Flexibility. Greater Hygiene. Next-Generation Separation: The Adjustable Impeller Flottweg’s adjustable impeller allows you to optimally adapt your decanter to changing process requirements—for the highest separation resolution and maximum product yield. More about the adjustable impeller Decanter Features Decanter Scroll Decanter Bowl Wear Protection Materials Simp Drive® Differential Speed Recuvane® Overflow Weir Adjustable Impeller Pond Depth Lubrication Sealing Systems Hygienic Design Separator Features Impellizer Centripetal Pump Lubrication Soft Shot® FLEX Disc Stack Hydrohermetics Drive Bowl Nozzle separator bowl Nozzles Safety shot Process Automation Ingo Motice Remote maintenance Curved Screen Dough Mixer Services Flottweg Process Center Process development and pilot-scale testing – test your application under realistic conditions. 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More About the USA Location Company Germany Australia China Mexico Brazil Italy USA Poland Peru France Canada Thailand Company History Sustainability Compliance and Corporate Governance Facts Why Flottweg Certificates References Contact Flottweg Worldwide Information for Suppliers Contact Form Contact To the contact form Social Media facebook instagram linkedin youtube Language English­ German­ Russian­ Spanish­ Italian­ French­ Chinese­ Polish­ Portuguese­ Newsroom Search Contact OSE Decanter for Sludge Thickening Constant thickening for optimum digestion tower utilization and maximum gas yield Reduces operating costs with 20% energy savings and minimal polymer consumption Made in Germany: Low maintenance thanks to high-quality materials and clever design Get advice now Home Product Lines Decanter OSE Decanter OSE = Optimum Sludge Thickening The Decanter Centrifuge for Thickening Sewage Sludge In the process of treating waste water, fine biological sludge is constantly produced during the decomposition process at a sewage treatment plant. For a stable decomposition process in the biological treatment phase, the sludge produced in the secondary sedimentation pond, also known as excess sludge, is removed and fed into the digestion tower. Flottweg's OSE decanters thicken the sludge before it enters the digestion tower. Sewage treatment plants benefit from an even feeding of the digestion tower and can thus optimally use the volume of the digestion tower. The Flottweg OSE decanter is specially designed for sludge thickening. Thus this thickening centrifuge achieves considerably better separation qualities than other centrifuges. 70 years of experience and know-how in the field of sewage sludge thickening flow into our Flottweg OSE decanters. The thickening decanter is thus convincing in terms of reliability, high economy and minimum maintenance. Consult us now Download Brochure The following machines are available in the OSE version: C-series Decanter centrifuges for thickening and dewatering of sludges Operating principles of a Flottweg OSE decanter The excess sludge from the secondary clarifier is pumped into the OSE decanter. This separates the solid from the liquid by means of centrifugal acceleration. The excess sludge is thickened from 0.5 - 1 percent (5-10 grams per liter) dry matter (DM) to 6 - 8 percent DM. The dry matter content in the thickened sewage sludge depends on the pumpability of the thick sludge and the thickening equipment used. Cross section of a Flottweg OSE decanter of the C-series For use in the thickening of sewage sludge The sludge thickening process Thickening sewage sludge means concentrating excess sludge that accumulates in the biological phases of the sewage treatment plant. Learn more about the process of sludge thickening and sludge treatment. More about sludge thickening Innovative sewage sludge thickening with starch polymer Thickening sludge with starch polymer requires the use of potato or pea starch polymers instead of synthetic polymer flocking agents. More about thicken sludge with starch polymer Product features Power Flottweg OSE decanters keep the discharge of dry material constant, thereby feeding the digestion tower steadily and maximizing gas yield. The continuous and automatic control to a predetermined dry matter content, e.g. 6 percent, leads to efficient and stable digestion. The Simp Drive® concept generates a differential speed between the centrifuge bowl and scroll. This is decisive for the time the sludge remains in the bowl. With Flottweg OSE decanters, the differential speed is automatically adjusted depending on the current load in the machine. This means that the thick sludge concentration remains constant even with changing feed conditions. The Flottweg OSE decanter is specially designed for sludge thickening. This enables them to achieve better performance than comparable units. A special scroll design with deep pond and steep cone increases the sedimentation volume in the decanter bowl. This enables a higher output density (10 - 20 percent) and makes the system more efficient. Highest gas yield through constant feeding of the digestion tower Best possible thickening even with changing feed conditions Larger sedimentation volume (due to deep pond and steep cone) enables highest power density (10 - 20 percent) with minimum space requirement Cost saving Thickening centrifuges are operated at a very low primary speed, which keeps the electrical power requirement low. In addition, the Flottweg Recuvane® system reduces energy consumption by a further 20 %. The OSE decanter has a very low flocculant requirement of only 1-2 g/kg dry matter. Even polymer-free operation is possible. Lower quantities of flocculant and less energy are required, which leads to significant cost savings compared to other thickening equipment such as belt thickeners. Thanks to the compact design of the OSE decanter, there is a considerable reduction in floor space requirements. This makes replacement investments possible without any additional construction work. Lowest operating costs due to reduction of the required flocculants and lower energy consumption Additional 20 % energy saving when using the Flottweg Recuvane ® system Low space requirement allows replacement investment without construction work Maintenance The OSE decanter was specially designed for optimized maintenance. The maintenance-friendly and easily accessible design ensures that downtime can be kept to a minimum when maintenance work is required. Wear protection measures , the use of high-quality stainless steels and replaceable wear parts minimize maintenance costs considerably - quality made in Germany pays. Maintenance-friendly, easily accessible design promotes minimal downtime Maximum service life through the use of optimized wear protection measures and high-grade stainless steels (corrosion and acid resistant) Operation In addition to minimizing maintenance costs, the operating expense of an OSE decanter is also minimal. The user-friendly control system, the Flottweg Touch Control, allows easy operation of the thickening centrifuge. The new InGo user interface facilitates simple control. Thanks to InGo, all important control parameters are visible at a glance. The thickening decanter can optionally also be used in automatic 24-hour operation. For this purpose, the centrifuge is switched on and off in a timed cycle. The operating personnel who are still required are not exposed to any health hazards during operation, as the centrifuge is a closed system. This prevents aerosol contamination or the escape of dirt and odors. Automatic 24-hour operation, incl. time-controlled on/off switching No health hazards for operating personnel (no aerosol or odor nuisance) Simple operation and user-friendly control with Flottweg Touch Control and InGo. Germany's oldest city relies on a Flottweg OSE decanter Germany‘s oldest City chooses latest Separation Technology from Flottweg Germany‘s oldest City chooses latest Separation Technology from Flottweg Play YouTube video Flottweg Thickening Centrifuge Animation Flottweg Thickening Centrifuge Flottweg Thickening Centrifuge Play YouTube video Talk to us or write us! Would you like to find out more about our OSE decanter for sludge thickening? ​​​​​​​Contact us now Contact us now Get advice from our experts now Top of page © 2026 Flottweg SE Privacy Policy Article 13 GDPR Imprint Downloads Wiki facebook instagram linkedin youtube