Analysis of the distribution of plant nutrients in a biogas production system
This study examined nutrient flows in a system where 20 farms deliver manure to a biogas plant for digestion, and then receive digestate back. Some other substrates were also anaerobically digested at the plant e.g. slaughter residues. The farms had different types of production: Organic and convent...
| Autor principal: | |
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| Formato: | Second cycle, A2E |
| Lenguaje: | sueco Inglés |
| Publicado: |
2019
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| Acceso en línea: | https://stud.epsilon.slu.se/14181/ |
| _version_ | 1855572368391405568 |
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| author | Johansson, André |
| author_browse | Johansson, André |
| author_facet | Johansson, André |
| author_sort | Johansson, André |
| collection | Epsilon Archive for Student Projects |
| description | This study examined nutrient flows in a system where 20 farms deliver manure to a biogas plant for digestion, and then receive digestate back. Some other substrates were also anaerobically digested at the plant e.g. slaughter residues. The farms had different types of production: Organic and conventional dairy and conventional pig. The aim was to analyse the re-distribution of plant nutrients this creates. Biogas pro-duction is of interest since it has the potential to reduce the use of fossil fuels and potentially also greenhouse gas emission. The use of digestate as fertilizer has the potential for a more even distribution of plant nutrients across the landscape.
Data was taken from the biogas production plant and then analysed and organized to be able to see what the different types of farms contributed with in terms of plant nutrients. The results showed that there is a redistribution of plant nutrients between the farms and one type of farm can lose or gain nutrients compared to the other types of farms. The “winner” of the different types of farms seemed to be the organic dairy farms as they gained mineral nitrogen, whereas the others lost mineral N. The organic dairy farms lost phosphorous and potassium however, so it is dependent on each in-dividual farm what plant nutrient is valued the most. Conventional pig farms gained K whereas the dairy farms lost K. All types of farms lost P which was probably due to the solid fraction of the digestate being separated and not included in the digestate going back to the farms. The study also showed that the substrates other than manure had an influence on the plant nutrient content of the digestate. Slaughter residues stood for a lot of the total ingoing organic nitrogen to the biogas plant. |
| format | Second cycle, A2E |
| id | RepoSLU14181 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2019 |
| publishDateSort | 2019 |
| record_format | eprints |
| spelling | RepoSLU141812020-06-04T12:50:30Z https://stud.epsilon.slu.se/14181/ Analysis of the distribution of plant nutrients in a biogas production system Johansson, André Agricultural research Processing of agricultural wastes This study examined nutrient flows in a system where 20 farms deliver manure to a biogas plant for digestion, and then receive digestate back. Some other substrates were also anaerobically digested at the plant e.g. slaughter residues. The farms had different types of production: Organic and conventional dairy and conventional pig. The aim was to analyse the re-distribution of plant nutrients this creates. Biogas pro-duction is of interest since it has the potential to reduce the use of fossil fuels and potentially also greenhouse gas emission. The use of digestate as fertilizer has the potential for a more even distribution of plant nutrients across the landscape. Data was taken from the biogas production plant and then analysed and organized to be able to see what the different types of farms contributed with in terms of plant nutrients. The results showed that there is a redistribution of plant nutrients between the farms and one type of farm can lose or gain nutrients compared to the other types of farms. The “winner” of the different types of farms seemed to be the organic dairy farms as they gained mineral nitrogen, whereas the others lost mineral N. The organic dairy farms lost phosphorous and potassium however, so it is dependent on each in-dividual farm what plant nutrient is valued the most. Conventional pig farms gained K whereas the dairy farms lost K. All types of farms lost P which was probably due to the solid fraction of the digestate being separated and not included in the digestate going back to the farms. The study also showed that the substrates other than manure had an influence on the plant nutrient content of the digestate. Slaughter residues stood for a lot of the total ingoing organic nitrogen to the biogas plant. Denna uppsats undersökte flödet av växtnäring i ett biogasproduktionssystem där 20 gårdar levererar gödsel för rötning och tar tillbaka rötrest. En del andra substrat användes också i rötningen, exempelvis slaktrester. Gårdarna hade olika produktionsinriktningar: Ekologisk och konventionell mjölkproduktion samt konventionell svinuppfödning. Målet med uppsatsen var att analysera omfördelningen av växtnäring som skapas mellan gårdarna i detta system. Biogasproduktion är av intresse på grund av dess möjlighet att minska användandet av fossila bränslen och potentiellt även utsläpp av växthusgaser. Att använda rötrest som gödselmedel skapar förutsättningar för en jämnare fördelning av växtnäring i landskapet. Data som togs från biogasanläggningen analyserades och organiserades för att skapa en bild av vad de olika produktionsinriktningarna bidrog med till systemet, i form av växtnäring. Resultatet visade att växtnäring omfördelas mellan gårdarna och att en typ av gård kan förlora eller tjäna växtnäring jämfört med en annan typ av gård. ”Vinnaren” bland de olika produktionsinriktningarna verkade vara de ekologiska mjölkgårdarna eftersom de tjänade mineralkväve medan de andra typerna förlorade mineralkväve. Gårdarna med ekologisk mjölkproduktion förlorade dock fosfor och kalium, och vilken typ av gård som kan anses tjäna på systemet var därmed subjektivt. De konventionella grisgårdarna tjänade kalium medan både ekologiska och konventionella mjölkgårdar förlorade kalium. Alla typer av gårdar förlorade fosfor vilket troligtvis berodde på att den fasta fraktionen i rötresten separerades och var inte inkluderad i den rötrest som transporterades tillbaka till gårdarna. Dessutom såldes en del rötrest till växtodlingsgårdar. Studien visade också att substraten utöver gödseln påverkade växtnäringsinnehållet i rötresten. Slaktrester stod för en stor del av den totala mängden organiskt kväve som inkom till biogasanläggningen. 2019-01-28 Second cycle, A2E NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/14181/1/johansson_a_190128.pdf Johansson, André, 2019. Analysis of the distribution of plant nutrients in a biogas production system : a look at VH Biogas, co-digesting manure from several farms. Second cycle, A2E. Uppsala: (NL, NJ) > Dept. of Soil and Environment <https://stud.epsilon.slu.se/view/divisions/OID-435.html> urn:nbn:se:slu:epsilon-s-10182 eng |
| spellingShingle | Agricultural research Processing of agricultural wastes Johansson, André Analysis of the distribution of plant nutrients in a biogas production system |
| title | Analysis of the distribution of plant nutrients in a biogas production system |
| title_full | Analysis of the distribution of plant nutrients in a biogas production system |
| title_fullStr | Analysis of the distribution of plant nutrients in a biogas production system |
| title_full_unstemmed | Analysis of the distribution of plant nutrients in a biogas production system |
| title_short | Analysis of the distribution of plant nutrients in a biogas production system |
| title_sort | analysis of the distribution of plant nutrients in a biogas production system |
| topic | Agricultural research Processing of agricultural wastes |
| url | https://stud.epsilon.slu.se/14181/ https://stud.epsilon.slu.se/14181/ |