Effects of post anaerobic digestion thermal hydrolysis on dewaterability and moisture distribution in digestates

Effects of post anaerobic digestion thermal hydrolysis on dewaterability and moisture distribution in digestates

Organic waste fractions such as sewage sludge, food waste and manure can be stabilized by anaerobic digestion (AD) to produce renewable energy in the form of biogas. Following AD, the digested solid fraction (digestate) is usually dewatered to reduce the volume before transportation. Post-AD treatme...

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Hauptverfasser: Svennevik, Oda K, Solheim, Odd Egil, Beck, Greeley, Sørland, Geir, Jonassen, Kjell Rune, Rus, Ester, Westereng, Bjørge, Horn, Svein Jarle, Higgins, Matthew J, Nilsen, Pål Jahre
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creator Svennevik, Oda K
Solheim, Odd Egil
Beck, Greeley
Sørland, Geir
Jonassen, Kjell Rune
Rus, Ester
Westereng, Bjørge
Horn, Svein Jarle
Higgins, Matthew J
Nilsen, Pål Jahre
description Organic waste fractions such as sewage sludge, food waste and manure can be stabilized by anaerobic digestion (AD) to produce renewable energy in the form of biogas. Following AD, the digested solid fraction (digestate) is usually dewatered to reduce the volume before transportation. Post-AD treatments such as the Post-AD thermal hydrolysis process (Post-AD THP) have been developed to improve the dewatering, but the mode of action is not well understood. In this study, samples from 32 commercial full-scale plants were used to assess the impact of Post-AD THP on a broad range of raw materials. Maximum dewatered cake solids after Post-AD THP was predicted by thermogravimetric analysis (TGA). Post-AD THP changed the moisture distribution of the samples by increasing the free water fraction. A consistent improvement in predicted dewatered cake solids was achieved across the 32 samples tested, on average increasing the dry solids concentration by 87%. A full-scale trial showed that dewatering Post-AD THP digestate at 80 °C improved dewatered cake solids above the predictions by TGA at 35 °C. In conclusion, dewatered cake solids were significantly improved by Post-AD THP, reducing the volume of dewatered cake for disposal.
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title Effects of post anaerobic digestion thermal hydrolysis on dewaterability and moisture distribution in digestates
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