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Hydrodynamic cavitation applied to food waste anaerobic digestion
Linköpings universitet, Institutionen för tema, Tema Miljöförändring.
2016 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

Innovative pre-treatment methods applied to anaerobic digestion (AD) have developed to enhance the methane yields of food waste. This study investigates hydrodynamic cavitation, which induce disintegration of biomass through microbubble formations, impact on food waste solubilisation and methane production during following AD. Two different sub-streams of food waste (before and after the digestion) pre-treated by hydrodynamic cavitation were evaluated in lab scale for its potential for implementation in a full scale practise. First, the optimum condition for the hydrodynamic cavitation device was determined based on the solids and chemical changes in the food waste. The exposure time was referred to as the number of cycles that the sample was recirculated through the cavitation inducer’s region. The optimal cycles were later tested as a pre-treatment step in a BMP test and semi-CSTR lab scale operation. The tests showed that sufficient impact from the hydrodynamic cavitation was achieved by 20 cavitation cycles. Due to the pre-treatment, food waste solubilisation increased, up to 400% and 48% in terms of turbidity and sCOD measurements, respectively. In the BMP test, the treated samples improved the methane yield by 9-13%, where the digested food waste increased its kinetic constant by 60%. Fresh food waste was then processed in the semi-CSTR operation and the methane yield was increased by up to 17% with hydrodynamic cavitation for two reference periods. These promising results suggest that the hydrodynamic cavitation can be implemented for full scale production with food waste.

sted, utgiver, år, opplag, sider
2016. , s. 51
Emneord [en]
Anaerobic Digestion, Biogas, Pre-treatment, Hydrodynamic cavitation
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-128268OAI: oai:DiVA.org:liu-128268DiVA, id: diva2:930482
Eksternt samarbeid
Scandinavian Biogas Fuels AB
Fag / kurs
Biotechnology
Presentation
2016-04-08, Lethe, Linköping, 10:15 (engelsk)
Veileder
Examiner
Tilgjengelig fra: 2016-05-24 Laget: 2016-05-24 Sist oppdatert: 2016-05-24bibliografisk kontrollert

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