Variation in the mass and moisture content of solid organic waste originating from a pig complex during its fermentation
Laen...
Kuupäev
2020
Kättesaadavus
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
The focus of the study was the fermentation of an organic waste mixture originating
from a pig-rearing complex. The organic waste was processed in the laboratory-scale drum
fermenter. Through the fermentation process, the fermented material was weighed by a system
of four strain gauges installed under the fermenter. In our previous study, the following initial
mixture characteristics were justified to have the fermentation process going – 65% to 70%
moisture content and 400–600 kg m-3 density. The optimal operation mode of the fermenter was
identified depending on the initial mixture composition – aeration frequency of 5 min h-1
; air
consumption of 11.3 m3 h
-1 per 1.7 m3 of the fermenter volume; drum rotation interval – three
times every 12 hours. Under this operating mode, the mass loss was 3% already on the third
fermentation day and 7% – on the fifth day. As a result, the mass of the finished organic fertiliser
was 9% smaller than that of the loaded mixture. The moisture content of the processed material
also decreased: under the average moisture content of the loaded mixture of 68.7%, the average
moisture content of the organic fertiliser was 66.4%. Based on the resulting experimental data,
the mathematical models describing the dependence of the mass and moisture content of the
processed material on the fermentation time were created. The study outcomes allow concluding
that the solid-state aerobic fermentation is one of the promising options for the utilisation of the
solid fraction of pig slurry.
Kirjeldus
Märksõnad
organic waste, slurry, organic fertiliser, fermentation, mass, moisture content, articles