Mono fermentation of grass silage by means of loop reactors
2009
Koch, Konrad | Wichern, Marc | Lübken, Manfred | Horn, Harald
A loop reactor was operated for mono fermentation of grass silage without manure addition under mesophilic conditions (38°C). An averaged specific biogas production of [formula removed] per kg volatile solids (VS) with a methane concentration of 52% at an organic loading rate of up to 3.5kgVS/(m³ d) was obtained. The retention time varied from 440days at 1.0kgVS/(m³ d) to 50days at 3.5kgVS/(m³ d). The degradation level was more than 60% based on VS and 75% based on COD. The first-order hydrolysis rate constant of the process was estimated to be 0.6d⁻¹. Despite the relative high ammonium concentration of up to 4g/l, the system worked stable for an operation period of 310days. In particular the TS content in the fermenter was found to be a key parameter and should not exceed 12% in order to avoid instabilities.
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