Huge engineering solution arrives at Horsham wastewater works

Wednesday, 24 September 2025 07:00

By Philip Keeler X @keeler_philip

Archimedes screws - (C) Southern Water 2025

Two giant Archimedes screws have been installed at Horsham Wastewater Treatment Works as part of a £36 million upgrade.

Each screw is 15 metres long, weighs more than eight tonnes, and can lift 680 litres of wastewater every second.

Costing £1.2 million, the new equipment replaces older machinery and runs on electric motors – moving the site away from diesel power towards a cleaner, greener future.

 

Project manager Jonathon Quirk said: "These monster screws are a vital part of keeping Horsham’s wastewater treatment processes flowing smoothly. This upgrade is a big step forward in making our operations more reliable and sustainable — and it’s great to see it in action."

Sam Scargill is Construction and Delivery Lead at CMDP - a joint venture between Costain and MWH Treatment – which are delivering the Horsham upgrade project

He added: "The installation of the new screws is a significant moment for the Horsham  team. A lot of work has gone into not just the removal and installation of the screws, but also the over-pumping and temporary works to enable the removal of the screws while maintaining the operational requirements of the work."

 

 

 

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