SPECIAL WORKS
Despite a series of storm events, the new SPIRAC screens have proved part of a very positive upgrade that will improve local river quality.
New screens firmly in place as SPIRAC and MWH Treatment fight back the storms
At a crucial stage of a £43M upgrade, including a critical inlet screen and screen handling replacement, the last thing a contractor would want is for not one, not two, but three back-to-back storm events.
Yet for one leading solution provider to the water industry, it provided the ultimate test for new inlet screens at Hartshill Sewage Treatment Works (STW) near Nuneaton (pe 100,000) in Warwickshire, England.
Since July 2022 (through to November 2024), MWH Treatment are responsible for the design and integration of new inlet screens and screens handling, expansion of the current primary and secondary treatment, plus the addition of a new tertiary treatment and a sludge treatment system.
This important STW is an all-flows-works; being upgraded as part of proactive capital maintenance, and in lieu of an additional 430 l/s which is to be pumped over from Hinckley (pe 50,000) in nearby Leicestershire, to create a total flow of 1560 l/s.
New SPIRAC screens have already passed the ultimate test at Severn Trent’s Hartshill Sewage Treatment Works near Nuneaton.
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Working to reduce steel and concrete use where possible, Severn Trent Water and MWH Treatment wanted to reuse the existing inlet structure; removing the need for any new civils, or modifications to the existing assembly, which would have increased the programme of works substantially; adding to costs, environmental impact and health & safety risks. Using 3D digital models to increase
| June 2024 |
www.draintraderltd.com
on-site productivity, and with the benefit of SPIRAC’s vertical, space-saving screens able to reach 2m down (rather than a restrictive 1m), the inlet was meticulously planned out in the virtual space. This has made it much easier and more economic to fine-tune a design, rather than have equipment arrive on site, only for it to be sent away again for modifications.
‘The final screens would be spot on’
“From the start,” said Vince Walker from MWH Treatment, SPIRAC assigned a dedicated team so that we had continuity and clear lines of communication. Leading up to the pressure of the switchovers from old to new equipment, we were regularly sharing our computer screens with SPIRAC’s Projects & Technical team, so that the new temporary launder systems would keep us online and that the final screens would be spot on; pre- assembled, tested, ready to slot right in. In the meantime, SPIRAC removed all the redundant equipment; also supplying us with a new control philosophy for the news screens and compactors.
He added: “It seems easy to say now,” he added, “especially with the foul weather after the commissioning works, but this is where planning and collaboration is so important. In a very carefully managed, phased approach, we had five separate stages of switching over, with SPIRAC removing the old screens, introducing a temporary launder system, whilst ensuring that flows were maintained, but with no loss of screening.”
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