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Enviroflex GmbH, based in Austria, is a leading provider of innovative solid-liquid separation technologies. With years of expertise in the field, we specialize in complete, tailor-made solutions for municipal and industrial sludge treatment—from primary thickening to final dewatering.
Our current catalogue focuses exclusively on our high-performance belt presses and belt thickeners, engineered to deliver reliable, efficient, and cost-effective results for a wide range of sludge types.
Gravity Belt Thickeners: Ideal for thickening dilute sludge (e.g., primary or secondary sludge) to a manageable consistency, minimizing volume before further treatment or disposal.
Belt Filter Presses: Designed for continuous dewatering of thickened or illiquid sludge, producing a dry cake with high solids content.
Integrated Systems: Combined units with both belt thickener and stages in one frame—perfect for thin sludges like waste activated sludge (WAS), offering a compact and fully automated process.
High Capture Rate – Advanced belt and roller design ensures minimal solids loss in filtrate (typically <1%), protecting downstream systems and optimizing efficiency.
High Dry Solids Content (DS%) – Precision-engineered pressure and shear zones, including high-pressure „tension“ rollers, achieve excellent cake dryness, even with difficult sludges.
Low Wash Water Consumption – Efficient belt cleaning systems reduce water use and operational costs.
Wide Belt Selection – High-quality belts available in various weave patterns, air permeability, and chemical resistance grades, customized for specific sludge characteristics.
Robust, Low-Maintenance Design – Built for long service life with corrosion-resistant materials and minimized mechanical complexity.
Flexible Operation – Adjustable belt speed, pressure zones, and polymer dosing for optimized performance under varying sludge loads.
Fully Automated Control Systems – Integrated with user-friendly HMIs and optional SCADA interfaces for remote monitoring and process optimization.
Compact Footprint – Space-saving designs available for containerized and retrofit applications.
In addition to manufacturing the belt thickening and dewatering units, we supply and integrate the full process chain:
Sludge feed tanks and pumps
Polymer preparation and dosing units (powder or emulsion)
Polymer mixing and maturation tanks
Sludge conveyors (screw, belt, shaftless)
Filtrate handling systems
Electrical control panels and automation (with CE compliance and ISO-certified production)
Although this catalogue focuses on • Integrated Systems: Combined units with both belt thickener and belt press stages in one frame, we also offer other belt presses and belt thickener alone as well as other sludge dewatering systems such as multi-disk screw presses for compact and low-speed operations. Contact us for custom configurations.
The HTE3-2000L is a fully integrated unit that combines a gravity belt thickener and belt filter press to provide efficient sludge dewatering for a wide range of sludge types. Its compact design, energy efficiency, and automation features make it ideal for both municipal and industrial applications.
Raw sludge is mixed with a flocculant in a pre-dosing and mixing tank equipped forming flocs that facilitate water release.
The flocculated sludge is distributed onto a gravity belt , where free water drains through the moving porous belt via gravity, concentrating the solids.
The thickened sludge is conveyed to the press section and compressed between two belts across 11 rollers, producing a dewatered sludge cake with high dry solids (DS) content.
A high-efficiency water spray system continuously cleans the belts via flush nozzles within a closed pipeline. No mechanical brushes are used.
Fully Integrated System – One compact unit for thickening and dewatering.
CE, Manufactured with compliance with CE safety regulation
Low Polymer Consumption – Polymer added only once; no secondary dosing.
Low Wash Water Consumption – Single high-efficiency pump (14 m 3/h).
High Capture Efficiency – 290% solids retention.
High Cake Solids – 16-20% DS depending on sludge type and characteristics like VSS of sludge as well as polymer flocculant efficiency
Low Filtrate Solids – 10-30 mg/L from the thickening section.
Durable Belts – Woven polyester monofilament belts with long lifespan.
Pneumatic Belt Control -Automatic alignment and tensioning using pneumatic components.
Easy Maintenance – Roller access and belt replacement designed for quick service.
Robust Frame – Coated carbon steel or stainless steel (SS304/316) as per order of customer
Quality Drive Components
Press Section Drive: Nord (Germany)
Thickener & Agitator Drive: SITI (Italy)
Belt Width
Thickener Belt Length
Dewatering Belt Length {Upper)
Dewatering Belt Length {Lower)
Belt Speed {Thickener)
Belt Speed {Press)
Number of Press Rollers
Expected Cake Dryness
Solids Capture Rate
Filtrate Solids {Thickener)
Mixing Tank Motor
Thickener Belt Drive Power
Press Belt Drive Power
Total Electric Power
Wash Water Pump
Compressed Air Requirement
Pneumatic Components Brand
Belt Material
Roller Material
Frame Material
Package Dimensions {Press Unit)
Package Weight {Press Unit)
Mixing Tank Dimensions
Mixing Tank Weight
2000 mm
8.15 m
11.0 m
11.4 m
3.84 – 19.2 m/min (10-50 Hz)
1.38 – 6.9 m/min (10-50 Hz)
11 ( 10 pieces SS304 + 1 polymer coated roller)
16-20% DS
More than 95%
20-50 mg/L
0.75 kW, 46 rpm (SITI, Italy)
1.1 kW – SITI, Italy
1.5 kW – Nord, Germany
3.35 kW
14 m3/h@ 4-6 bar
0.1 m3/min @ 5 bar
AIRTAC
Woven Polyester Monofilament
Stainless Steel 304
SS304 I Coated Carbon Steel (as per order ogf customer)
See drawing
5000-6000 kg
1500 x 1500 x 1700 mm
85 kg
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