German Combined Heat & Power (CHP) firm, Wolf Power Systems, has installed a 550 kW cogeneration plant at an existing on-farm anaerobic digestion facility in Aberdeenshire, Scotland.
According to the company the CHP plant will generate energy from waste at John Rennie & Sons’ arable and pig farm in Turriff, exporting around 500 kW to the grid.
An anaerobic digestion (AD) plant had already been operational at the site for 10 years, using around 15,000 tonnes of feedstock - mostly food waste and abattoir material, with some of the farm’s own pig slurry used as well.
The AD plant produces 67% methane and 32% carbon dioxide. Running on the biogas from the AD plant, Wolf said that the new CHP plant will be more efficient and have lower running costs. The expected output is 550 kW, of which 500 kW is exported to the national grid. The rest is used to run the facility.
The company added that the CHP also produces a lot of hot water, which is used to keep the digester at a constant 40°C.
Some of the hot water is also used by an on-site pasteurisation plant, which heats up the digestate to over 70°C and thereby kills any pathogens which may have been in the animal by-products or food waste. The digestate can then replace mineral fertilisers.
“Using AD with CHP units ensures the effective use of biogas and turns a waste product into a useful resource,” commented Markus Kruse, chief executive pf Wolf Power Systems.
Andrew Rennie, managing director at John Rennie & Sons added: “I think it is great that we can take the energy out of the waste streams, put it through the CHP and clean the digestate up again with its own energy and still be left with a good, clean and nutritious fertiliser to grow next year’s crops.”
“By doing this we have managed to reduce our fertiliser bill by 90% and have gone carbon neutral,” he concluded.
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