Abstract
The properties, types, and physical and chemical aspects of pig slurry used in the fermentation process were presented. Characterization of the pig slurry microflora for a controlled biogas production process was performed. A pilot biogas treatment installation was presented on the example of a farm with 1100 Dan Bred fatteners kept in a grate system. The research was carried out to measure the biogas flow rate resulting from the reference pressure in the fermentor. An independent assessment of the amount of biogas and the pressure drop in the skeletal deposit was carried out. The basis for assessing the hydrodynamics of gas flow through the adhesive bed is the flow characteristic, which results from the pressure that forces this flow. In each case, the determination of this characteristic consists in determining the influence of the biogas stream on the value of this overpressure, equivalent to the pressure drop (it is tantamount to determining the total biogas flow resistance through the adhesive bed). The results of the measurements indicate the practical application of pig slurry-a substrate in a polydisperse system for the production of agricultural biogas in the context of renewable energies. The article indicates that the ferment was periodically mixed during the day, together with the fermentation of the ferment with fresh substrate. The tests were conducted for 49 days, thus demonstrating that it is more advantageous to mix the ferment hydrodynamically, obtaining a CH4 level of about 80%.
Highlights
As a result of the litter-free animal husbandry system on farms, slurry is produced, which is a valuable source of fertilizer
Pig slurry is commonly used as a fertilizer due to low investment costs, taking into account its management for agricultural purposes in the area of the farm
The research material was a substrate in the form of pig slurry from a farm with 1100 Dan Bred fatteners [50] kept in a grate system Figure 1
Summary
As a result of the litter-free animal husbandry system on farms, slurry is produced, which is a valuable source of fertilizer. Farm animal husbandry generates greenhouse gas emissions, e.g., methane produced during the digestion of feed, especially by ruminants, and during manure storage [13] Another greenhouse gas with a higher environmental impact due to its persistence in the atmosphere that damages the ozone layer is nitrous oxide, which is mainly released during the use of manure. Another disadvantage of slurry is its high water content, which results in high costs of storage and transport to fields. These factors limit the intensive livestock production in favor of sustainable agriculture that will certainly not replace the current and anticipated demand for meat [14]
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