The contract with one of the UK's leading resource and waste management businesses, FCC Environment is said to be worth £26 Million.
The company will provide services for the transfer, management and treatment of green, food, bulky and wood waste with immediate effect. The initial contract term is five years but may be extended for up to a further five years.
The new contract sees most of the 70,000 tons of material be treated either in Buckinghamshire or just a few miles over the border, which means less miles travelled and less impact on the wider environment.
Bill Chapple OBE, Cabinet Member for Environment and Climate Change at Buckinghamshire Council, said: "We look forward to working together with FCC Environment to continue to improve recycling for our residents. I am really keen to see more work with the community and engaging with local people about what happens to their waste."