The aim of this study was to extend knowledge about the influence of permanent grassland fertilization on the yield and the quality of biogas.
During the years 2013 and 2014 three levels of fertilization (non fertilized control, N50PK, N200PK) were tested. Samples were taken from the experiment site Černíkovice, Benešov region. For anaerobic digestion, a 40 day mesophilic conditions batch test was chosen.
A statistically significant decrease of substrate biogas yield (SBY) and area biogas yield (ABY) with higher doses of fertilizers occurred between non fertilized control (575.4 ml/g; 3332.4 m3/ha) and N200PK variant (460.5 ml/g; 2605.7 m3/ha) in 2013. The only statistically significant differences in the quality of biogas were found during the first day of anaerobic digestion, when the highest doses of fertilizers caused higher concentration of methane (33.2 %) compared to control variant (22.6 %).
Application of fertilizers had no significant effect on SBY in 2014. Still, the highest SBY was obtained from the non fertilized control (762.7 ml/g) compared to N50PK (707.6 ml/g) and N200PK variant (732.8 ml/g). Furthermore, significant most of the ABY was obtained from the N50PK (2911.5 m3/ha) compared to the non fertilized control (2296.3 m3/ha). The only significant differences in biogas quality were found during the initial 7 days of the test. Most of the methane was contained in biogas from the non fertilized control (59.1 %), and least amount of the methane was found in the N50PK variant (57.9 %).
ABY is highly influenced by the yields of phytomass, which were negatively affected by the late first cut caused by unfavorable site conditions in 2013.
Cumulative biogas production showed that the most important part of anaerobic digestion was during the initial 14 days, which produced upwards of 80 % of total biogas yields in both years.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:256795 |
| Date | January 2016 |
| Creators | Stibůrek, Jakub |
| Contributors | Fuksa, Pavel, Jiří, Jiří |
| Publisher | Česká zemědělská univerzita v Praze |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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