The AD plant at Hemswell is located on a 5-acre site in the middle of Lincolnshire. The plant will generate 3.6 megawatts of power, which is sufficient to supply up to 4,000 homes or 10,000 people. The power is available 24 hours a day, 7 days a week.
The site is screened and benefits from the existing infrastructure of roads, on-site water and electricity, and available farmland for digestate spreeding.
The waste food for the plant will be sourced across northern England. We are partnered with another AD plant giving us excellent coverage across the Midlands as well for our food waste clients.
The plant was built by British-based Monsal, who have 20-years of experience building digesters in the water industry, and this will be their sixth AD food waste plant. Virtually any waste product can be effectively processed by the plant to produce a strong, stable gas yield with a short retention time required in the digester tanks. Packaged waste can be processed and cleaned by the plant, with the non-digestible products (plastics, grit etc.) being set aside for further recycling.
The plant has a large waste reception building with full odour control.
Processed feedstock is piped to the Hydroysis Tank, a 1,500 m3 vessel where the digestion process begins. From here the feedstock is pasteurised, then enters one of the two 4,000 m3 digesters. This is where the anaerobic reaction takes place, with billions of bacteria processing the calorific content of the feedstock and converting it into methane.
The methane is then tapped off the tanks, and is piped to a storage vessel. From there it is pumped into one of the three CHP generators. The electricity is then exported through underground cables into the national grid.
Digested feedstock (digestate, or biofertiliser) is piped out of the digester into the on-site lagoon ready to spread onto the crops on the surrounding farmland.