Screw Press for Industrial & Agricultural Dewatering Applications

Screw Press for Industrial & Agricultural Dewatering Applications

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Screw Press Upgrade Improves Solids Concentrations and Efficiency

Woodsville Evaluates Screw Presses for Sludge Dewatering

As the old belt press reached the end of its life, Pat Butler and the Woodsville Fire District began to search for a new dewatering solution that would dewater more sludge while requiring fewer labor hours.

“Initially, we explored a variety of screw press designs from different manufacturers. We thought all screw presses were more or less the same,” said Butler. “But we were very impressed with PWTech's pilot unit as it produced cake solids in the mid-20 percentile within minutes of being turned on.”

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After considering its options, the Woodsville Fire District decided to purchase a Volute Dewatering Press from PWTech. With the help of Russel Resources' John Hart, PWTech's representative in New England, the machine was installed in March of 2023 with little change to the existing layout. PWTech's in-house engineering team provided design services for the project.

Traditional screw presses have a casing with openings to allow the release of water from the sludge. If the openings are too large, the sludge extrudes and escapes the press. If the openings are too tight, the solids can clog the smaller openings. To combat the clogging issue, many presses incorporate cleaning mechanisms, but these can lead to maintenance and wash water issues.

The Volute Dewatering Press has no such openings. Instead, it features a dewatering drum with spacers and rings held in place with tie rods. The press has a series of fixed rings and between them are moving rings that are slightly smaller than the outer diameter of the screw. The moving rings are moved by the screw, and this continuous movement cleans the gaps between the moving and fixed rings, preventing clogging and resulting in an efficient and compact dewatering device.

The maintenance requirements are low, and it uses less wash water than a typical screw press, while still producing equivalent or drier cake solids. This also means the unit produces clean filtrate. The system is fully automated, enabling unattended operation around the clock, and is designed for minimal maintenance.

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