The deal is believed to be worth around 9.5 million. Thirty-six Roseland staff will transfer to Viridor.
Viridor said the deal would provide it with a substantial consented putrescible landfill capacity at Lean Quarry, a 75,000 tonne capacity materials recycling facility, an operational inert landfill, a fleet of waste collection vehicles, and a plant hire and contracting business.
The company intends to start putrescible landfill operations, on receipt of a pollution prevention and control permit, to serve east Cornwall, west Devon and Plymouth.
It said this new operation would facilitate the restoration of a dolerite quarry operated since 1947.
The MRF has been operational since 2000 and processes commercial and industrial waste. Its recyclates are sold locally.
Managing director Mike Hellings said the deal was part of Viridor's strategy to increase recycling capacity underpinned by safe and efficient collection and disposal facilities.
Viridor is owned by Pennon Group, which also owns South West Water.
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