Hydrothermal carbonization of anaerobically digested maize silage
2011
Mumme, Jan | Eckervogt, Lion | Pielert, Judith | Diakité, Mamadou | Rupp, Fabian | Kern, Jürgen
Hydrochars were prepared by hydrothermal carbonization (HTC) of maize silage previously treated at 55°C in a two-stage solid-state reactor system. The HTC was carried out in a 1-L stirred pressure reactor with pH regulation by citric acid. The treated silage carbonized at relatively mild conditions (190°C, 2h), and the hydrochars showed mainly amorphous macro-size features with a carbon content of 59–79% (ash-free, dry) and a higher heating value of 25–36MJkg⁻¹. Temperature was the main influencing factor. The surface area according to Brunauer–Emmett–Teller (BET) analysis was highest at 190°C (12.3m²g⁻¹). Based on these results, the hydrochars are potentially interesting for applications such as an alternative fuel or a soil conditioner.
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