Two enormous Archimedes screws - each the size of a double-decker bus – have been installed at Southern Water’s Horsham Wastewater Treatment Works as part of a £36 million upgrade at the West Sussex site.
The £1.2 million additions measure 15 metres in length and weigh 8600kg each, and are already being put to work, with each capable of lifting 680 litres of wastewater through the treatment process every second.
The new installation replaces aging machinery and is powered by electric motors, replacing the old diesel system.
The investment in Horsham is part of a wider push to boost resilience and efficiency across the water company’s network.
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 who are delivering the Horsham upgrade project commented:
"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 works.”
The overall scheme at Horsham will increase the amount of wastewater the site can treat, and help improve water quality nearby by reducing phosphate levels.
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