UK-based engineering and construction group Costain has secured a £200m contract to upgrade and expand the Liverpool Wastewater Treatment Works (WWTW) at Sandon Dock.

Costain along with its partners Galliford Try and Atkins will replace many plant items including the current inlet pumps, which lift wastewater from sewer level, with larger, more robust machinery.

Other improvement works to be carried out will extend the existing plant’s usage for an additional 15-20 years while the site remains operational throughout the upgrade project.

Costain construction manager Andy Fielding said that the existing WWTW equipment is in need of a upgrade as it has a limited remaining asset life.

The facility will also be extended into the neighboring Wellington Dock, which will be used to build a new Sequencing Batch Reactor (SBR) process tank.

The waste water treatment will have a new sludge treatment facility, which will feed the existing MAD plant that generates gas from the sludge as fuel for a CHP unit which can generate 1-2MW of electricity.

Liverpool WWTW GCA lead Darren Dobson said, "This large complex project is being delivered in partnership with our client UU.

"Our performance to date has been excellent and the team is now set up to ensure the project is successfully delivered and we achieve our project goals," added Dobson.