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Small farm scale mono-digestion of dairy slurry for energy independence and reduction in greenhouse gas emissions
The Den Eelder farm’s website proudly boasts that our cows poo electricity and heat. Thanks to a closed circuit monodigestion system, the farm actually runs on green energy produced from its own manure. The concept of producing biogas from cattle manure was of great interest to him. This was not just about using this renewable energy on the Den Eelder farm, but also to reduce the farms methane emissions.
The first-phase mono-digestion installation processed 7,000 tonnes of fresh manure per year, yielding 250,000 cubic metres of biogas. The combined heat and power (CHP) generator produced 500,000 kWh of electricity and 1 million kWh of heat every year. The heat is used to raise the temperature of the manure before it goes into the digester and to heat the digesters. The electricity is used on the farm. The Den Eelder farm recently expanded its capacity by adding an extra digester. The additional digester can hold up to 1,500 cubic metres of manure and store a thousand cubic metres of gas. A biogas heater (700 kW) is used to heat water to 110°C. This addition increased the overall capacity to 15,000tonnes of fresh manure per year. The installation (Fig 53) now yields 1.5 million kWh of heat per year for the Den Eelder farm’s own dairy produce operation. They now produce more than enough to meet the farm’s energy demand, except at peak times. The remaining energy required will come from the solar panels that they are installing on the roofs of the animal enclosures, which means that the farm will have zero energy importation. The digester stirs the manure and heats it to 40°C. This yields 30 to 40 cubic metres of biogas, with a 60% methane content, per ton of manure.
The global biogas market size was estimated at USD 65.53 billion in 2023 and is projected to expand at a compound annual growth rate (CAGR) of 4.2% from 2024 to 2030
Anaerobic digestion has CO2 reduction and waste mitigation potential
Making dairy farming much more sustainable by providing an additional source of revenue to the farmers and biogas produced covers 40-50 % of the electricity use with its own energy production
Farmers, Technologist, End users of biogas
Dairy slurry
9
Den Elder farm
Anaerobic digestion
Biogas, biofertiliser
15,000 tonnes of cow manure annually, 500,000 kWh of electricity and 1.5 million kWh of heat
Netherlands
2013
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