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Will different pretreatment methods influence the biogas production of seaweeds
Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
2018 (engelsk)Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
Abstract [en]

Global warming along with energy demand and rising prices of natural energy resources have motivated studies to find some renewable and clean energy. The use of algae as third generation biofuel can avoid the competition for farmland and algae can be considered as a potential future source of renewable energy. Algae can be used for biogas production through anaerobic digestion (AD). Fucus vesiculosus and Fucus serratus are the two dominating species of brown seaweed growing in the Baltic sea in the southwest of Sweden. Pretreatment can significantly affect the biogas production since hydrolysis of algae cell wall structure is a rate-limiting step in AD process. In this study, four different pretreatments: mechanical, microwave (600W, 2min), ultrasonic (110V, 15min), and microwave combined with ultrasonic (600W, 2min;110V, 15min) were applied to the seaweed and then co-digested with biogas plant leachate. The aim was to investigate the biogas production and methane yield from AD after these pretreatments. The results showed when comparing with mechanical pretreated only, that the ultrasonic, ultrasonic combined with microwave and microwave pretreatments could obtain increased cumulative methane yields with 167%, 185% and 156% , respectively. The maximum methane yield was 260 ml/g∙VS with combined pretreatment after 20 days of digestion. The ultrasonic combined with microwave pretreatment showed a significant improvement of methane yield when comparing with mechanical pretreatment.

sted, utgiver, år, opplag, sider
2018. , s. 31
Emneord [en]
methane; seaweed; pretreatments; anaerobic digestion
HSV kategori
Identifikatorer
URN: urn:nbn:se:hh:diva-37396OAI: oai:DiVA.org:hh-37396DiVA, id: diva2:1228919
Fag / kurs
Environmental Science
Utdanningsprogram
Master's Programme in Applied Environmental Science
Examiner
Tilgjengelig fra: 2018-08-07 Laget: 2018-06-29 Sist oppdatert: 2018-08-07bibliografisk kontrollert

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