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Evaluation of psychrotrophic anaerobic digestion of food waste
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Industrial Biotechnology.
2024 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Utvärdering av psykrotrofisk anaerob nedbrytning av matavfall (Swedish)
Abstract [sv]

Anaerob nedbrytning vid låg temperatur är ett energieffektivt system, men få studier har fastställt kinetiken för anaerob nedbrytning av matavfall vid dessa temperaturer. I denna studie bestämdes kinetiken för en anaerob rötkammare för matavfall med mesofil inokulum vid 20°C. Effekten av acklimatiseringstiden avslöjades. Därefter användes biokol och spårämnen för att utvärdera deras inverkan vid 20°C. Det visade sig att tillsats av spårämnen ökade kinetiken upp till 114% av kontrollreaktorn. Denna studie visade att olika biokol har varierande effekt på kinetiken (här negativ och neutral effekt). De kinetiska värdena utvärderades med en första ordningens modell och användes för att uppskatta en virtuell fabrik. Med ett inflöde på 27 000 ton bioavfall/år och 80 % av den maximala metanpotentialen ansågs en psykrofil i ett steg vara orealistiskt (hydraulisk retentionstid (HRT): 9,6 månader med den experimentella kinetiken). Lovande resultat kan dock uppnås med en lämplig kombination av utetemperatur och substrattemperatur. 

Abstract [en]

Low temperature anaerobic digestion is an energy efficient system, however few studies have determined the kinetics of the anaerobic digestion of food waste at those temperatures. This study determined the kinetics of a food waste anaerobic digestor with mesophilic inoculum at 20°C. The impact of acclimatation time was revealed. Then biochar and trace elements were employed to evaluate their impact at 20°C. It was shown that addition of the trace elements boosted the kinetic up to 114% of the control reactor. This study proved that different biochars have variable effect on the kinetics (here negative and neutral effect). The kinetic values were evaluated with a first order model and used to estimate a virtual factory. With 27 000 tons of biowaste /year influx and 80% expression of the maximum methane potential, a single stage psychrophilic was deemed unrealizable (Hydraulic Retention Time (HRT): 9.6 month with the experimental kinetics). However, promising results can be obtained with an adequate exterior temperature & substrate temperature couple. 

Place, publisher, year, edition, pages
2024.
Series
TRITA-CBH-GRU ; 2024:033
Keywords [en]
Anaerobic digestion, low temperature, food waste, kinetics, first order model
Keywords [sv]
Anaerob nedbrytning, låg temperatur, matavfall, kinetik, första ordningens modell
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:kth:diva-346296OAI: oai:DiVA.org:kth-346296DiVA, id: diva2:1857170
External cooperation
SUEZ SA
Subject / course
Chemical Engineering
Educational program
Master of Science in Engineering - Engineering Chemistry
Supervisors
Examiners
Available from: 2024-05-13 Created: 2024-05-13

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • Other locale
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