The plants will cost £35m to build and will generate energy from biogas as bi-products of the sludge treatment process and also produce fertilisers for recycling.
Galliford Try has completed similar anaerobic digestion plants for the same client at King’s Lynn in Norfolk and Great Billing in Northamptonshire.
Greg Fitzgerald, chief executive of Galliford Try, said: “We are delighted to secure this additional business from an existing framework client. It builds on our track record in delivering both clean and waste water infrastructure projects as a leading infrastructure contractor to the water industry.”