| heal.abstract |
In this study, maize silage was anaerobically mono- and co-digested together with low solid swine wastewater in a novel two-state (liquid/solid) anaerobic digester. The special subject of the two-state digester is that operates with both, liquid and solid fractions, which are present in a segregated form inside the digester. The feeding and the withdrawal of the liquid and the solid fraction can be performed independently to allow different retention times for each fraction. In this study, as solid substrate, maize silage was used, which was nested in a plastic mesh in order to be kept inside the digester in a segregated solid state against the liquid state. As liquid substrate, low solid swine wastewater was used. In general, it was easy to remove separately and independently the two solid and liquid fractions. Two types of digesters were used: one batch type (BT) digester, in which maize silage was mono-digested as sole substrate and a combined type (CT) digester, in which maize silage was fed batch and the low solid swine wastewater was fed semi-continuously (every 48 h). Average biomethane yield at organic load rate of 1 kg VS/mR 3-48 h amounted to 0.477 Nm3/kg VS for the BT and to 0.334 Nm3/kg VS for the CT digesters. © 2013 AIP Publishing LLC. |
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