Foto de stock - 09 April 2018, Germany, Sieversdorf: Fermentation residues from a biogas plant are spread on a field (taken with drone). The residues which remain after the fermentation of biomass from liquid to solid at a biogas plant are called fermentation residues. Primarily, manure, dung, regrowing plants or a mix of these substrates are processed under exclusion of oxygen for energy production at biogas plants. Photo: Patrick Pleul/dpa-Zentralbild/ZB. - Sieversdorf/Brandenburg/Germany

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