Aerobic solid-state fermentation of the solid fraction of pig slurry
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Kuupäev
2020
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Abstrakt
Current expansion in the pig number in Russia and their concentration in separate
locations contribute to higher environmental risks. One key risk factor is the slurry produced. To
utilize it more efficiently, many pig farms introduce its solid-liquid separation. The study
objective was to explore the feasibility of accelerated aerobic solid-state fermentation of the solid
fraction of pig slurry in closed installations. The stable thermophilic process under the
temperature above +55 °C achieves shorter processing time of 3–4 days. To date, however, there
is no representative evidence of such an experience. Four options of fermented mixture
composition were tested based on two types of the solid fraction of pig slurry: Type 1 fraction
coming from a screw separator and Type 2 fraction coming from a decanter centrifuge. The
fermenter operating modes were tested in the authors’ previous studies associated with processing
of the solid fraction of cattle manure and bedding poultry manure. The intensity measure of
fermentation was the temperature reached by the processed material in the fermenter. Under the
investigated operation modes, the stable temperature was observed for nine days in the mesophilic
process: 20 °С to 55 °С; in some cases, the transition to the thermophilic process – above 55 °С
was recorded. Adding the catalytic components to the processed material accelerated the substrate
self-heating and a higher temperature up to 59 °С was reached. This suggests that the considered
operating modes of the fermenter were suitable for the fermentation of the specified substrate.
Kirjeldus
Märksõnad
solid-state fermentation, aerobic fermentation, pig slurry, slurry handling, articles