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Production of volatile fatty acids from anaerobic digestion using food waste, sludge and cow manure
University of Borås, Faculty of Textiles, Engineering and Business.
University of Borås, Faculty of Textiles, Engineering and Business.
2019 (English)Independent thesis Basic level (university diploma), 180 HE creditsStudent thesisAlternative title
Produktion av flyktiga fettsyror från anaerobisk rötning genom matavfall, slam och kogödsel (Swedish)
Abstract [en]

Volatile fatty acids (VFAs) are important building blocks for the chemical industry. These acids can be produced through environmentally friendly processes from a variety of wastes, such as food waste, sludge and cow manure, through anaerobic digestion (AD). The main objective of this thesis was to investigate which operating parameters (e.g. pH, retention time, mix of substrate etc.) are optimal for producing VFAs as efficiently as possible, through AD batch processes. The highest VFA concentration was reached at pH 10 and at day 11 when food waste and sludge were used as substrate to a value of 15.4 g/L, corresponding to 0.77 g VFAs/ g of VSfed. Highest VFA concentration where cow manure was used as substrate was reached on day 10 and with a value of about 10 g/L corresponding to 0.51 g VFAs/ g VSfed.

Abstract [sv]

Flyktiga fettsyror (VFAs) är en viktig byggsten inom den globala kemiindustrin. Dessa fettsyror kan produceras med hjälp av miljövänliga processer där en mängd olika sorters avfall, som t.ex. matavfall, avloppsslam och koavföring kan fungera som substrat, genom anaerobisk rötning. Det huvudsakliga målet med den här kandidatuppsatsen var att utreda vilka de optimala driftförhållanden var för särskilt utvalda driftparametrar (t.ex. pH, retentionstid, mix av substrat etc.) för att producera flyktiga fettsyror så effektivt som möjligt, genom anaerobisk rötning. Högst koncentration av VFAs nåddes vid pH 10 på dag 11 när matavfall och avloppsslam användes tillsammans som substrat till ett värde på 15 g/L, vilket motsvarar en avkastning på 0.77 g VFAs / g VSin. Högst VFAs-koncentration när koavföring användes som substrat nåddes på dag 10 med ett värde på 10 g/L, motsvarande en avkastning på 0.51 g VFA/ g VSin.

Place, publisher, year, edition, pages
2019.
Keywords [en]
VFAs, anaerobic digestion, food waste, sludge, cow manure
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hb:diva-21642OAI: oai:DiVA.org:hb-21642DiVA, id: diva2:1344542
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Available from: 2019-08-26 Created: 2019-08-21 Last updated: 2019-08-26Bibliographically approved

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3940414243444542 of 70
CiteExportLink to record
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  • apa
  • harvard1
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  • de-DE
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  • sv-SE
  • Other locale
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Output format
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