The technology that is utilised at the Cambridgeshire site has a Gicom designed computer controlled batch tunnel system. This was regarded as the optimum for the New Technology’s Demonstrator Programme.
The New Technologies Demonstrator Programme Report
The technology incorporates measurement and control devices, biotechnical process control, and air handling systems, all designed to work together for optimum efficiency with the software system. The technology has a number of different applications, including:
The composting of biowaste, food waste, sewage sludge, industrial sludges, manure, municipal solid waste and anaerobic digestion residue.
The biological drying of municipal solid wastes and other waste streams containing organics.
The production of mushroom composts from poultry litter and straw.
The tunnels are constructed in a modular fashion with different tunnel sizes depending upon the volume of feedstock to be processed. The tunnels can vary from 15m to 50m in length and from 4m to 8.5m wide. Each tunnel, depending upon its size, can process between 60 and 600 tonnes of feedstock. Each facility includes a different number of tunnels depending upon the design requirements for throughput. Facilities have been constructed with between 3 and 50 tunnels.
Envar currently utilises nine Gicom designed tunnels with a total capacity of 2,800 tonnes able to process over 100,000 tonnes of co-mingled food and green wastes annually. The construction of five of the new 400 tonne capacity tunnels were completed and AHVLA validated in April 2013.
All tunnels at Envar operate to the Alternative Transformation Parameters which ensures the efficient pasteurisation and the creation of optimal conditions for the breakdown of organic matter during the tunnel process. The result being a safe, pathogen-free product with no anaerobic odours.