Drying of biogas digestate in a hybrid solar/waste-heat drying plant
- Publikations-Art
- Kongressbeitrag
- Autoren
- Maurer C, Starcevic N, Müller J
- Erscheinungsjahr
- 2009
- Veröffentlicht in
- Tagungsband Landtechnik - AgEng 2009
- Verlag
- VDI Verlag GmbH , Düsseldorf (Germany)
- ISBN / ISSN / eISSN
- 978-3-18-092060-3
- Seite (von - bis)
- 217-222
- Tagungsname
- Agricultural Engineering 2009: "Innovations to Meet Future Challenges"
- Tagungsort
- Hannover (Germany)
- Tagungsdatum
- 6.-7.11.2009
The amendment to the Renewable Energy Sources Act (Germany, 2009) advocates the use of waste heat for conditioning biogas residues for fertilizer production with the “Kraft-Wärme-Kopplungs-Bonus” [1]. There are different methods available to treat the digestate (partial- and full-conditioning) [2]) in order to utilize the heat generated by a combined heat and power unit (CHP). One method to treat the digestate after fermentation is to dry it in a solar drying plant.
In this study, digestate from a biogas plant was investigated during the drying process in a hybrid solar/waste-heat drying plant. The composition of the digestate (dry matter, total N, NH4-N, P2O5, K2O, MgO, CaO) was analysed before and after the drying process. In addition, climate data was recorded during the drying process, as well as the dry matter (DM) and the organic dry matter (ODM), which were analysed on a daily basis to investigate the drying behaviour of the digestate. Furthermore, the thermal energy which is used for solar drying and the CHPs was recorded.