Organic and metal material from domestic waste is mechanically separated at the companys Newcastle Resource Recovery Centre in Byker before the organic fraction is sent through Ellingtons in-vessel composting process.
It takes about 10 weeks for the raw material to become ready for reuse from when it enters the site.
Sita UK area manager Julie Craigie said: Because of the nature of materials used to produce the soil conditioner, the end product is classed as recovered waste and the EA has stringent quality standards that must be met before they will allow the material to be used for landscaping and restoration purposes.
The granting of the exemption to spread the in-vessel produced compost to land is a demonstration of the quality of the product we are producing here and of the beneficial nature of the product in helping to improve poor quality land.
With the facility able to produce around 20,000 tonnes a year, Sita is now negotiating with local landowners and land restoration companies who require large amounts of material to landscape their sites.