Sludge dewatering
Continuous sludge dewatering equipment with integrated thickening, low-speed screw compression and self-cleaning moving and fixed rings for municipal and industrial wastewater applications.
Product overview
A product-level view of the equipment duty, process position and functional zones.
A multi-disc screw press is mechanical sludge-dewatering equipment used after the selected sludge-conditioning steps. Its process duty is to separate water from conditioned sludge so that the remaining cake is easier to handle, transport or route to the approved downstream destination.
The equipment combines flocculation, progressive thickening and dewatering within a compact process train. Moving and fixed rings around the low-speed screw create a self-cleaning filtration structure intended to reduce screen blockage during continuous operation.
The KS series includes 15 models from KS-131 to KS-404. Reference duties cover five sludge conditions at 0.2% to 5.0% total solids, but final capacity still depends on the actual sludge, polymer response, operating schedule and target cake condition.
For broader engineering context on mechanical dewatering, sludge conditioning and feed-solids effects, see the U.S. EPA sludge-dewatering design manual. Its historical numerical examples are not used as current KUOSI specifications or project guarantees.
Receives sludge after the selected polymer preparation and flocculation step.
Begins free-water separation before the pressure-dewatering section.
Applies increasing mechanical pressure as material moves toward discharge.
Moving and fixed rings support continuous filtration-surface cleaning.
Routes dewatered cake to the selected conveyor, container or downstream handling arrangement.
Engineering advantages
Evaluate the equipment through operating implications, not decorative feature claims.
The KS model range uses a 2–4 rpm screw speed, 0.2–9.55 kW main drive power and a 0.01–0.1 kWh/kg-DS reference energy range.
The moving and fixed ring structure supports self-cleaning without relying on continuous high-volume wash water.
The standard arrangement integrates metering, flocculation, dewatering and discharge for continuous automatic operation within the selected control strategy.
Relative ring movement supports filtration-surface cleaning and helps reduce blockage risk.
Thickening and dewatering duties are combined in an integrated equipment arrangement.
The model table includes raw-water chemical sludge, excess sludge, pressurized-flotation sludge and mixed or digested municipal sludge reference duties.
Applications
Application fit must be confirmed from sludge characteristics, conditioning response and the required downstream handling duty.
Waste activated sludge or combined municipal sludge routed from the selected treatment and solids-management process.
View packaged biological treatmentConfirm feed-solids variability, operating hours and the plant's cake-handling route.
Organic process sludge produced by physical, chemical or biological treatment steps.
Evaluate fats, fibres, biological content and conditioning response before selection.
Process sludge with site-specific chemical and solids characteristics.
Review compatibility, safety data and material requirements for the actual sludge.
Biological or chemical sludge generated by colour, solids and organic-load treatment processes.
Confirm conditioning behaviour and how variable production cycles affect the duty.
Fibre-bearing primary, secondary or combined sludge from mill treatment processes.
Evaluate fibre content, feed concentration and the required downstream cake condition.
Site-specific sludge where mechanical dewatering is required before handling or disposal.
Treatability evidence is required when sludge composition or operating conditions vary.
Performance
Unconfirmed values remain visible as content requirements so the page cannot be mistaken for an approved data sheet.
| Parameter | Value / range | Engineering note |
|---|---|---|
| Feed sludge concentration | 0.2–5.0% TS reference columns | Separate duties apply by sludge type and concentration; confirm the actual design range from sludge data and testing. |
| Dry solids capacity | 4–1,768 kg-DS/h | Reference range across KS-131 to KS-404 and five sludge-condition columns. |
| Cake moisture / solids | Below 85% moisture reference basis | Listed capacities use sludge cake below 85% water content as a reference basis; actual results remain sludge- and polymer-specific. |
| Main drive power | 0.2–9.55 kW | Product-specification range; confirm voltage, frequency and final motor selection. |
| Wash water | 24–320 reference values | The unit is not specified; confirm flow, pressure, cleaning sequence and unit before design. |
| Operation mode | Continuous, automatic | Duty cycle, interlocks and control sequence remain project-specific. |
| Construction | Stainless-steel equipment structure | The material grade is not specified; confirm wetted-part grade by model and sludge chemistry. |
Working principle
This summary explains how the equipment performs its duty. The Technology page covers the wider process theory and selection context.
Labels describe equipment flow and components; operating values still require the approved model data.
Prepared polymer and controlled mixing form a sludge structure suitable for the selected dewatering duty.
Free water begins to separate as conditioned sludge enters the initial filtration zone.
The screw conveys material through a progressively restricted zone to increase separation pressure.
Dewatered solids leave the press for the selected downstream handling arrangement.
Relative movement of the ring structure supports cleaning of the filtration gaps during operation.
Equipment video
Watch conditioned sludge move from the flocculation section into the multi-disc dewatering drum and toward cake discharge. The footage provides an operating reference for the sequence described on this page: feed conditioning, progressive water separation and final solids discharge. Use it to understand equipment layout and material movement, not as a guaranteed performance test. Actual throughput, capture, cake condition and polymer demand depend on the sludge, selected model and operating settings.
System configuration
The dewatering duty sits within a wider feed, conditioning, separation and cake-handling system.
Final interfaces and included equipment are defined by the agreed project scope.
Confirm the required material from sludge chemistry, corrosion conditions and the approved equipment model.
Verify ring, spacer and filtration-gap details against the selected KUOSI model data.
Review sludge abrasiveness and the available screw-blade protection for the actual duty.
Match power supply, duty and reducer selection to the confirmed model and project standard.
Define enclosure, installation environment, control philosophy and interlock requirements.
Confirm level, flow, dosing and alarm signals required for integration with the wider plant.
A selected feed pump transfers sludge from storage or the preceding process.
Prepared polymer supports the selected conditioning duty.
Controlled mixing creates the feed condition required for mechanical separation.
Thickening and mechanical dewatering reduce the water carried with the sludge.
Separated liquid is routed according to the overall plant mass balance.
Cake moves to the approved conveying, storage, transport or disposal route.
Main equipment
Supporting / optional equipment
Technical data
Capacity and flow ranges span five sludge categories at 0.2–5.0% TS. Units for the listed dimensions, weights and wash-water values require confirmation. Final model selection and guaranteed performance require an approved project data sheet and actual sludge evaluation.
Scroll horizontally to review all technical fields on smaller screens.
| Model | DS capacity range | Reference flow range | Drive power | Wash-water value | L × W × H | Net / operating weight |
|---|---|---|---|---|---|---|
| KS-131 | 4–26 kg-DS/h | 0.4–2.0 m³/h | 0.2 kW | 24 | 1870 × 730 × 1170 | 205 / 300 |
| KS-132 | 8–52 kg-DS/h | 0.8–4.0 m³/h | 0.3 kW | 48 | 2000 × 960 × 1230 | 275 / 425 |
| KS-201 | 8–52 kg-DS/h | 0.8–4.0 m³/h | 0.74 kW | 32 | 2690 × 880 × 1500 | 320 / 470 |
| KS-202 | 16–104 kg-DS/h | 1.6–8.0 m³/h | 1.11 kW | 64 | 2810 × 1120 × 1600 | 470 / 730 |
| KS-301 | 20–130 kg-DS/h | 2.0–10.0 m³/h | 1.5 kW | 40 | 3310 × 1000 × 1700 | 910 / 1320 |
| KS-302 | 40–260 kg-DS/h | 4.0–20.0 m³/h | 2.25 kW | 80 | 3500 × 1300 × 1700 | 1350 / 2130 |
| KS-303 | 60–390 kg-DS/h | 6.0–30.0 m³/h | 3 kW | 120 | 3700 × 1650 × 1700 | 1820 / 2880 |
| KS-351 | 40–260 kg-DS/h | 4.0–20.0 m³/h | 1.1 kW | 72 | 3610 × 1100 × 1850 | 1610 / 2210 |
| KS-352 | 80–520 kg-DS/h | 8.0–40.0 m³/h | 2.75 kW | 144 | 3820 × 1490 × 1850 | 2300 / 3400 |
| KS-353 | 120–780 kg-DS/h | 12.0–60.0 m³/h | 5.7 kW | 216 | 4120 × 1770 × 1850 | 3350 / 4850 |
| KS-354 | 160–1,040 kg-DS/h | 16.0–80.0 m³/h | 9.55 kW | 288 | 4320 × 2290 × 1850 | 4500 / 6100 |
| KS-401 | 70–442 kg-DS/h | 6.5–35.0 m³/h | 1.85 kW | 80 | 4550 × 1180 × 2250 | 2500 / 3400 |
| KS-402 | 135–884 kg-DS/h | 13.6–67.5 m³/h | 2.95 kW | 160 | 4870 × 1710 × 2250 | 3480 / 5200 |
| KS-403 | 200–1,326 kg-DS/h | 20.4–100 m³/h | 4.05 kW | 240 | 4790 × 2550 × 2250 | 4550 / 7050 |
| KS-404 | 266–1,768 kg-DS/h | 27.2–133 m³/h | 5.15 kW | 320 | 4840 × 3140 × 2250 | 6550 / 9660 |
Equipment selection
Selection begins with sludge and duty data; wastewater flow alone is not an adequate sizing basis.
Identify the source process and whether the feed is primary, biological, chemical or combined sludge.
Provide the expected feed-solids range, including normal and variable conditions.
Define the mass of dry solids to be processed over the available operating period.
Confirm daily and weekly availability, batch constraints and redundancy expectations.
Describe the downstream handling route and target moisture or solids content, if known.
Share polymer type, preparation method, trial results and dose information when available.
Confirm footprint, access, climate, corrosion context, voltage and integration constraints.
Manufacturing & installation evidence
These images document KUOSI equipment and installation contexts. They are not presented as quantified project case studies.
Real equipment imagery from KUOSI's existing Screw Press product material.
Site imagery showing handling, installation and operating context.
Engineering support
Support is presented as a practical engineering workflow, without unverified company statistics or outcome claims.
Review the available wastewater and sludge conditions before equipment selection.
Evaluate equipment capacity from the actual process duty and operating schedule.
Define the required feed, polymer, control and cake-handling interfaces.
Prepare the applicable drawings, technical data and installation requirements.
Provide installation and commissioning guidance according to the agreed project scope.
Technical FAQ
The answers separate general selection logic from the values that require a project-specific technical review.
Municipal and industrial sludge can be evaluated, including biological, physical-chemical and combined sludge. Suitability depends on solids characteristics, conditioning response and the required dewatering duty; it should be confirmed from project data or testing.
Model duties cover 0.2%, 1.0%, 2.0%, 3.0% and 5.0% total solids for different sludge categories. These are selection references, not a universal operating envelope; confirm the actual sludge, polymer response and required throughput.
Listed capacities use sludge cake below 85% water content as a reference basis. Actual cake moisture varies with sludge type, feed concentration, polymer conditioning, throughput and operating settings, so project performance must be confirmed from tests or verified application data.
Understand cake solids and moistureSelection uses required dry-solids throughput, calculated from the sludge flow and solids concentration, together with operating hours and sludge-specific performance evidence. Wastewater flow alone is not the sizing basis.
Use the screw press capacity guidePolymer type and dose depend on sludge chemistry and flocculation response. Bench or site testing is the appropriate basis when no verified operating data is available.
Review polymer selection and dosageModel values range from 24 to 320, but the unit requires confirmation. Confirm the required flow, pressure, cleaning sequence and unit on the approved model data sheet before design.
Both mechanically dewater conditioned sludge, but they use different separation structures, cleaning arrangements, footprints and operating regimes. A comparison should use the actual sludge, capacity, cake target, utility limits and maintenance context.
Compare screw and belt filter pressesProvide sludge source, feed concentration, required dry-solids capacity, operating schedule, polymer information, cake-handling requirement and site constraints. KUOSI can then evaluate the appropriate model and supporting system scope.
Engineering inquiry
Share your sludge characteristics, required treatment capacity and operating conditions. KUOSI can use the available information to begin evaluating the appropriate model and system configuration.
