Deerdykes is a Composting and Organics Recycling Facility In-Vessel Project, actively receiving green waste, liquid wastes (industrial effluents) and sludges (from industrial wastes) for on-site processing. Green waste is delivered in large waste collection vehicles and is offloaded into a reception area. It is shredded and composted in extended beds on hard-standing areas. Liquid waste is delivered to site in tankers and off-loaded into one of the storage tanks below the sludge house. Liquid waste is stored prior to being discharged to sewer. Sludges are processed through a dewaterer in the mixing building.
The liquid fraction after pressing is discharged to sewer and the cake is mixed with the shredded green waste and co-composted in the Invessel compositing tunnels. The function of the tunnels is to stabilize green waste, stabilize sludge cake or animal by-products, to reduce odor generation during composting. During stabilization in the tunnels air is passed through the shredded green waste and sludge mix in a controlled manner. Air that passes through the material is either re-circulated or sent to the wet scrubber and bio-filter for treatment. Air is supplied to the tunnels using blowers and air distribution networks are cast into the tunnel bases, supplying fresh and re-circulated air to compost the material. When composted the material is removed using a wheeled loader as is placed into a maturation area before being screened to the required sizes and stored until dispatch as a high value commercial product. This is a new market entry for MWH into Solid Waste. In-vessel composting is fairly new in terms of solid waste with only a few plants built throughout the U.K., but with a growing trend towards more solid waste process this market is expanding rapidly.
The in-vessel composting process is only the beginning of the development of the Deerdykes site, with materials handling improvements planned and an Aerobic Digestion Plant also being proposed.
4 No new RC compost tunnels, 35 m long x 5.3 m high x 5.3 m wide, each complete with tunnel doors.
Access stairways and metalwork.
New portal steel frame weather building.
New RC access road.
New surface water collection sump.
Ducts and drawpits.
Drainage pipework.
Miscellaneous RC bases.
4 No composting blowers.
2 No exhaust vent scrubbers.
2 No exhaust vent biofilters.
1 No range of air ducting and dampers.
1 No cover to circular surface water balance tank.
