Viftrup Biogas opened in 2015. The biogas plant generates 2.3 million cubic metres of methane gas a year. This is then transported to Spjald Fjernvarmeværk (Spjald District Heating Plant) by means of a pipeline. No less than 97% of the consumption at Spjald Fjernvarmeværk is generated by methane gas from Viftrup Biogas.
On a daily basis, the plant handles 10 to 80 tonnes of biomass – a mixture of maize, seed grass straw, straw, second-cut hay and deep litter.
More gas than first expected
Due to the big quantity of dry matter in straw, deep litter and seed grass straw that was supplied to the plant, Viftrup Biogas experienced a very high volume of dry matter in the degassed manure. Therefore, Viftrup Biogas in 2019 decided to establish a 4,600m³ secondary digester. This new post-degassing tank for instance resulted in prolongation of the residence time.