Three-screw stainless steel screw press for sludge dewatering in an industrial hall

Product Range

RF Series Multi-Disc Screw Press

Self-cleaning multi-disc screw presses for continuous sludge thickening and dewatering

The RF series is a modular range of self-cleaning multi-disc screw presses for continuous thickening and dewatering of municipal and industrial sludge. Combining pre-thickening, filtrate separation, and mechanical dewatering in a compact system. Available in single, dual, triple, and quad configurations covering nominal capacities from 6 to 1,664 kg DS/h.

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Working Principle

The sludge is first conditioned with polymer and gently mixed in a flocculation unit. The flocculated sludge then enters the dewatering drum composed of alternating fixed and moving ring discs. In the initial section, free water drains through the ring gaps (pre-thickening). In the subsequent dewatering section, screw compression and internal pressure increase. The gap width of the ring discs and screw pitch are tapered toward the discharge end. This compresses the sludge and produces a dewatered sludge cake. The moving ring discs continuously clean the filtration gaps through their relative motion. This prevents blockages and enables stable operation even with demanding, oily, or fibrous sludges.

RF Series Screw Press

Self-Cleaning Ring Disc Filter Elements

Fixed and moving stainless steel rings form the filtration gaps and keep them clear continuously — no filter cloth, no clogging.

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Your Advantages with the RF Series

Thickening & Dewatering in One Machine

Separate thickeners or large-volume sludge storage can be eliminated or downsized.

Processes Low-Concentration Sludge

Suitable for dilute WAS as well as thickened, stabilized, or DAF sludge. From approximately 0.2% DS.

Self-Cleaning Ring Gap Technology

Moving and fixed ring discs keep filtration gaps clear through continuous relative motion.

Suitable for Oily & Greasy Sludge

The open, self-cleaning design handles sludges that clog filter cloth or fine screens.

Low Speed, Low Energy

Dewatering at low screw speed without high centrifugal forces. 0.2–5.15 kW.

Quiet & Vibration-Free

The slow, continuous operation supports quiet plant environments.

Fully Automatable

Integrates with PLC, SCADA, polymer station, sludge feed, and cake handling.

Modular Scalability

From compact single units to quad configurations for high throughput.

Screw Press Systems in Detail

Stainless steel multi-disc screw presses from compact single-screw units to high-capacity quad configurations.

Compact single-screw press for sludge dewatering with flocculation tank and control panel — Compact Single-Screw PressEntry-level unit for small treatment plants and industrial sites — inspection windows allow a view of the screw.

Two-screw sludge dewatering screw press with stainless steel control panel — Two-Screw Unit with Control PanelReady-to-connect dewatering unit with touch panel control, flocculation tank and cake discharge chute.

Two-screw screw press with dewatered sludge cake discharge trough — Sludge Cake DischargeThe dewatered cake drops into a discharge trough — ready for a conveyor, container or skip.

Three-screw sludge dewatering machine with geared motors and sludge cake discharge — Three-Screw Dewatering MachineIndividually driven screws at low speed — quiet, energy-efficient and easy to maintain.

Three-screw screw press with flocculation tank, polymer dosing piping and filtrate flanges — Flocculation Tank & ConnectionsIntegrated flocculation with mixer drive, polymer piping and flanged filtrate outlets for straightforward installation.

Four-screw stainless steel screw press sludge dewatering machine with geared motors — Four-Screw ConfigurationTwo twin dewatering units on a common stainless steel frame — maximum throughput with a small footprint.

RF Series Model Overview

Model	Units	Application	Nominal at 1.0% DS	Max. at 3.0% DS
RF-131	1	Small plants	6 kg DS/h	26 kg DS/h
RF-132	2	Small plants / Commercial	12 kg DS/h	52 kg DS/h
RF-201	1	Small to medium plants	12 kg DS/h	57 kg DS/h
RF-202	2	Medium plants	24 kg DS/h	114 kg DS/h
RF-301	1	Municipal and industrial	30 kg DS/h	130 kg DS/h
RF-302	2	Medium capacity range	60 kg DS/h	260 kg DS/h
RF-303	3	Increased throughput	90 kg DS/h	390 kg DS/h
RF-351	1	High solids loads	60 kg DS/h	260 kg DS/h
RF-352	2	Large plants	120 kg DS/h	520 kg DS/h
RF-353	3	Large plants / Industrial	180 kg DS/h	780 kg DS/h
RF-354	4	Central sludge treatment	240 kg DS/h	1,040 kg DS/h
RF-401	1	Large-scale plants	100 kg DS/h	416 kg DS/h
RF-402	2	Large-scale plants	200 kg DS/h	832 kg DS/h
RF-403	3	Very high loads	300 kg DS/h	1,248 kg DS/h
RF-404	4	Maximum capacity	400 kg DS/h	1,664 kg DS/h

Technical Data

Model	Discharge H.	Length	Width	Height	Dry Wt.	Op. Wt.	Power	Wash Water
RF-131	250 mm	1,860 mm	700 mm	915 mm	205 kg	300 kg	0.20 kW	24 L/h
RF-132	250 mm	1,905 mm	830 mm	915 mm	275 kg	425 kg	0.30 kW	48 L/h
RF-201	350 mm	2,555 mm	920 mm	1,465 mm	320 kg	470 kg	0.74 kW	32 L/h
RF-202	350 mm	2,615 mm	960 mm	1,465 mm	470 kg	730 kg	1.11 kW	64 L/h
RF-301	495 mm	3,325 mm	870 mm	1,760 mm	910 kg	1,320 kg	1.50 kW	40 L/h
RF-302	495 mm	3,455 mm	1,135 mm	1,760 mm	1,350 kg	2,130 kg	2.25 kW	80 L/h
RF-303	495 mm	3,670 mm	1,560 mm	1,760 mm	1,820 kg	2,880 kg	3.00 kW	120 L/h
RF-351	585 mm	3,475 mm	905 mm	1,820 mm	1,610 kg	2,210 kg	1.10 kW	72 L/h
RF-352	585 mm	3,570 mm	1,285 mm	1,820 mm	2,300 kg	3,400 kg	2.75 kW	144 L/h
RF-353	585 mm	3,645 mm	1,725 mm	1,820 mm	3,350 kg	4,850 kg	3.85 kW	216 L/h
RF-354	585 mm	4,130 mm	2,180 mm	1,820 mm	4,500 kg	6,100 kg	4.95 kW	288 L/h
RF-401	759 mm	3,905 mm	1,070 mm	2,210 mm	2,500 kg	3,400 kg	1.85 kW	80 L/h
RF-402	759 mm	4,240 mm	1,570 mm	2,210 mm	3,480 kg	5,200 kg	2.95 kW	160 L/h
RF-403	759 mm	4,465 mm	2,060 mm	2,210 mm	4,550 kg	7,050 kg	4.05 kW	240 L/h
RF-404	759 mm	4,670 mm	2,630 mm	2,210 mm	6,550 kg	9,660 kg	5.15 kW	320 L/h

Dimensions, weights, power, and wash water refer to the base machine. Polymer station, feed pump, flocculation unit, control panel, conveyor, piping, and special options may change the actual installation footprint, connected load, and total weight.

Performance & Throughput Data

Model	WAS/Chem. 0.2% DS	1.0% DS	2.0% DS	DAF 5.0% DS	Mixed 3.0% DS
RF-131	4 kg DS/h / 2 m³/h	6 / 0.6 m³/h	10 / 0.5 m³/h	20 / 0.4 m³/h	26 / 0.87 m³/h
RF-132	8 kg DS/h / 4 m³/h	12 / 1.2 m³/h	20 / 1 m³/h	40 / 0.8 m³/h	52 / 1.74 m³/h
RF-201	8 kg DS/h / 4 m³/h	12 / 1.2 m³/h	20 / 1 m³/h	44 / 0.88 m³/h	57 / 1.9 m³/h
RF-202	16 kg DS/h / 8 m³/h	24 / 2.4 m³/h	40 / 2 m³/h	88 / 1.76 m³/h	114 / 3.8 m³/h
RF-301	20 kg DS/h / 10 m³/h	30 / 3 m³/h	50 / 2.5 m³/h	100 / 2 m³/h	130 / 4.33 m³/h
RF-302	40 kg DS/h / 20 m³/h	60 / 6 m³/h	100 / 5 m³/h	200 / 4 m³/h	260 / 8.67 m³/h
RF-303	60 kg DS/h / 30 m³/h	90 / 9 m³/h	150 / 7.5 m³/h	300 / 6 m³/h	390 / 13 m³/h
RF-351	40 kg DS/h / 20 m³/h	60 / 6 m³/h	100 / 5 m³/h	200 / 4 m³/h	260 / 8.67 m³/h
RF-352	80 kg DS/h / 40 m³/h	120 / 12 m³/h	200 / 10 m³/h	400 / 8 m³/h	520 / 17.3 m³/h
RF-353	120 kg DS/h / 60 m³/h	180 / 18 m³/h	300 / 15 m³/h	600 / 12 m³/h	780 / 26 m³/h
RF-354	160 kg DS/h / 80 m³/h	240 / 24 m³/h	400 / 20 m³/h	800 / 16 m³/h	1,040 / 34.7 m³/h
RF-401	65 kg DS/h / 32.5 m³/h	100 / 10 m³/h	180 / 8 m³/h	320 / 6.4 m³/h	416 / 13.8 m³/h
RF-402	130 kg DS/h / 65 m³/h	200 / 20 m³/h	320 / 16 m³/h	640 / 12.8 m³/h	832 / 27.7 m³/h
RF-403	195 kg DS/h / 97.5 m³/h	300 / 30 m³/h	480 / 24 m³/h	960 / 19.2 m³/h	1,248 / 41.6 m³/h
RF-404	260 kg DS/h / 130 m³/h	400 / 40 m³/h	640 / 32 m³/h	1280 / 25.6 m³/h	1,664 / 55.4 m³/h

Throughput values are indicative and refer to typical sludge types and feed concentrations. Actual performance depends on sludge composition, solids content, flocculation quality, polymer selection, target cake dry solids, and operating conditions. For final machine selection, we conduct an application-specific assessment. On request, validation through laboratory, pilot, or full-scale testing with original sludge.

Materials: Stainless Steel 316 and 316L

All wetted components of the RF series can be specified in stainless steel 316 or 316L on a project basis. This allows the system to be configured for municipal, industrial, and corrosion-critical applications. Final material selection is based on actual media analysis, particularly considering chlorides, sulfides, pH, temperature, and solids abrasion.

Material	Grade	Application Profile
Stainless Steel 316	1.4401	For many corrosion-resistant municipal and industrial applications
Stainless Steel 316L	1.4404	Preferred for welded, chloride-bearing, or highly corrosive media
Special alloys	Project-specific	For particularly demanding media, elevated chloride exposure, or special chemical processes

Equipment Options

Sludge feed pump
Polymer preparation and dosing system
Flocculation reactor with agitator
Automatic wash system
PLC control with touchpanel
Remote monitoring / SCADA integration
Sludge cake discharge conveyor
Filtrate collection and pump station
Sound enclosure / acoustic housing
Containment tray and leakage monitoring
Special corrosion/abrasion protection
Stainless steel 316 or 316L configuration
Custom dimensions and connection arrangements

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Our engineering team provides application-specific screw press sizing and selection — based on your sludge type, flow rate, and dewatering targets.

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