Two new 1.25 Megalitre tanks were installed along with a new pumping station to support the additional water flows.
At Hanningfield Water Treatment Works (WTW) the 'washwater' facility has doubled in capacity. Hanningfield WTW supports water supplies for up to 1.2 million customers as part of the company's network.
The washwater facility takes water that has been used for cleaning the site’s filters, so that it is not sent straight back into the environment.
After allowing sufficient time for settling, samples are collected. The purest water is then reintroduced into Hanningfield Reservoir, while the remaining sludge is directed into the reed beds on the site.
These reed beds were a first for sustainable solution for water treatment sludge, representing a saving of 70 tonnes of CO2 emissions a year, compared with the traditional system. They provide a natural method of dealing with the sludge, recycling the water back into the reservoir for re-use and removing the need for mechanical or chemical processes, along with the associated maintenance, labour and power.
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Steve Haviland, Contracts Manager for Farrans Construction, said: "There have been a number of excellent innovations in the water sector in recent years which will have a significant impact on the environmental sustainability of washwater facilities in the future and we are proud to have been involved in this one at Hanningfield.
"We led the construction of two new washwater tanks, a new pumping station, emergency lagoon outlet structure, buried pipelines, new access road and hardstanding. We worked closely with our partner the TES group during the M&E installation on the new works, and also on the refurbishment of the existing two wash water tanks and pumping station. The new treatment works are built for the future, with capacity and conservation at the heart of the design. The project was an excellent example of collaboration throughout from design to commissioning."
George Mok, Northumbrian Water’s Project Manager, said: "This has been an interesting project, because investment is not only helping ensure we can deliver the highest quality drinking water for more than a million people, but it also benefits the environment by utilising our innovative reed bed facility.
“This has been a project that has required great teamwork from across our business, from colleagues in Operations, to Regulation, to Conservation, as well as with the team at Farrans & TES, and we are really pleased that the newly expanded facility is now in action."
