3.3. Characterisation of inoculum and substrates
Table 2 shows the composition of inoculum and substrates used in experiments 1 and 2. In both cases TS concentration was relatively high, above 8% (near the upper limit for wet anaerobic digestion), and VS concentration around 6%. The proportion of organic materials, expressed by the ratio VS/TS, was higher in the substrate of experiment 1 (75%) than in experiment 2 (67%), probably due to the collection of a higher amount of mineral matter together with pig manure from sheds without a concrete base. For this reason, the TS content in the substrate of experiment 2 is higher than in
experiment 1, even though the VS content is nearly the same. In the inoculum of experiment 2, which was a mixture of effluents from experiment 1, the VS/TS ratio is much lower as a result of VS removal during the first experiment.
3.3. Characterisation of inoculum and substrates
Table 2 shows the composition of inoculum and substrates used in experiments 1 and 2. In both cases TS concentration was relatively high, above 8% (near the upper limit for wet anaerobic digestion), and VS concentration around 6%. The proportion of organic materials, expressed by the ratio VS/TS, was higher in the substrate of experiment 1 (75%) than in experiment 2 (67%), probably due to the collection of a higher amount of mineral matter together with pig manure from sheds without a concrete base. For this reason, the TS content in the substrate of experiment 2 is higher than in
experiment 1, even though the VS content is nearly the same. In the inoculum of experiment 2, which was a mixture of effluents from experiment 1, the VS/TS ratio is much lower as a result of VS removal during the first experiment.
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