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Screw Thickener Technology

Screw thickeners offer continuous, low-energy sludge thickening without polymer addition in many applications. The rotating screw within a perforated drum conveys sludge while filtrate drains through the screen, producing thickened sludge at 8–15% dry solids from feed concentrations as low as 0.5%.

Unlike gravity belt thickeners, screw thickeners require minimal wash water and operate in a fully enclosed, odour-controlled housing. The slow rotational speed (2–5 rpm) minimises shear on biological flocs, preserving floc structure and improving downstream dewatering performance in centrifuges or filter presses.

Specifications & Operating Parameters

Feed Flow

10 – 200 m³/hr

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Inlet Solids

0.5 – 2% DS

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Outlet Solids

6 – 10% DS

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Screen Diameter

160 – 500 mm

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Mesh Size

0.25 – 1.0 mm

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Drive Power

0.75 – 5.5 kW

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Wash Water

20 – 60 L/min at 3-5 bar

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Materials

SS304, SS316 screen, carbon steel frame

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Where This Equipment Is Used

Proven across a wide range of industrial water and wastewater treatment processes.

WAS Thickening

Concentrating waste activated sludge to reduce digester volume.

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Primary Sludge

Thickening raw sludge removed during primary clarification.

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Food Waste

Processing high-strength organic waste from food manufacturing and catering.

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Pulp & Paper

Treating process water and effluent from pulp and paper mills.

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Textile

Treating dyehouse effluent and process water for textile manufacturing.

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Municipal

Treating drinking water and sewage for towns and cities.

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Related Processes

This equipment is commonly integrated into the following treatment processes.

Sludge Management

Volume reduction before dewatering.

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Municipal WWTP

Surplus activated sludge thickening.

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Food Processing

Organic waste thickening.

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Containerised Systems

Integrated thickening in package plants.

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Related Equipment

Explore complementary equipment within our product range.

Screw Press

Dewatering after thickening.

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Multi-Disc Screw Press

Combined thickening and dewatering.

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Progressive Cavity Pump

Thickened sludge transfer.

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Polymer Station

Optional polymer for enhanced thickening.

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Industries We Serve

Our expertise spans multiple industries with sector-specific water treatment solutions.