The term biofuel is referred to as liquid or gasous fuels for the transport sector that are produced from biomass. Producing biofuels from cellulose- rich materials are considered as relevant technology nowadays. There is a research and technological development project for years at Malardalens Högskola about bioethanol and biogas production, and the university joined to the Vaxtkraft project in Vasteras, Sweden, aims to produce biogas out of ley crop and organic waste. The purpose of my study was to analyse the efficiency of producing transportation fuels, spezifyed ethanol and biogas from straw. Extraction of sugar from straw under different conditions with respect to pH, temperature and extraction time were studied. Thereafter biogasification with bacteria to form CH4 and ethanol fermentation with Saccharomyces was performed and the gas production measured. The extractions were carried out separately at 121 °C and 140-145 °C, with 20, 40, 60, 120 minutes extraction time. The pH during the processes was set to 5 and 3 with buffer solution. To consider the extraction rate, the better conditions are lower pH, higher temperature and longer extraction time. The results show the optimal extraction is performed at 140-145 °C for 120 minutes with pH 3. The gasification was carried out at 37 °C with using Baker’s yeast. The results indicate that in contrast to the extraction, the gasification is better with the samples which extraction was carried out at lower temperature and higher pH. The best gasification was achieved by the samples with 121°C and pH 5 extraction irrespectively of the extraction time, although they had the worst extraction rate results. More research and detailed quality analysis are needed to determine the reason of this seeming contradiction
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:mdh-778 |
| Date | January 2008 |
| Creators | Szaszi, Judit |
| Publisher | Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, Akademin för hållbar samhälls- och teknikutveckling |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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