Water & Wastewater Treatment

www.wwtonline.co.uk | WWT | ocTober 2014 | 15 H all Water Treatment Works (WTW) in Lincolnshire may only just be coming out of its testing phase, but it is already attract- ing international attention. Completed ahead of programme, exceeding tough carbon reduction targets and using an innovative treat- ment process, the £44 million pro- ject's achievements are all the more impressive given the location: by the time the River Trent reaches this point it has passed through several Midland cities and some intensively farmed land, and is beginning to turn tidal. "[The water] is dirty, turbid and difficult to treat, but we've come up with a green solution," says Chris Hastings, operations manager of main contractor GTM JV, a joint venture between Galliford Try and Imtech. Hall is particularly high profile because it is the first water treatment plant in the UK specifically designed to remove metaldehyde, the chemical used in agricultural pesticides. "Metaldehyde is difficult to remove using conventional treatment tech- nologies. We had to go back to the drawing board and find a different solution. The design evolved over the course of the project," comments Im- tech's technical manager Dr Stewart Bell. The fact that much of the treat- ment is being carried out using low-tech methods, removing the need for chemicals and reducing the power Water treatment Hall claims UK first in water treatment Project focus ● First UK water treatment plant UK specifically designed to remove metaldehyde ● Process is virtually chemical free ● Project's embodied carbon reduced by 63% Emma CratEs Freelance WriTer ● Hall WtW is one of anglian Water's special projects to provide more capacity for the fast growing population. Under current estimates, a supply shortfall of 100,000 properties is predicted in the local area by the end of 2036, although the extra capacity may be called upon sooner in times of drought. ● the new facility is supplementing a clean water treatment works in the nearby village of Newton-on-trent. the existing works extracts water from aqui- fers roughly 200 m below ground. But as there is no spare capacity in the aquifers, the new treatment facility is extracting water from the nearby river trent, the furthest downstream that water has ever been extracted from the river. ● Under normal circumstances, the pumping station is expected to extract 20 million litres/day, but has the capacity to pump 64 million litres/day should it be needed a er a long drought or following a shutdown. • Drivers The wet well sha for the new pump- ing station at Hall. The works extract water from the river Trent

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