Bio fuels and Biogas 0.0 / 5 ? BiologyEcology and Environmental ScienceGCSEAQA Created by: JH1010Created on: 14-10-15 07:27 Bio fuels Fermentation bacteria or yeast break dwon sugars by anaerobic respiration E.g. Glucose -> Ethanol + Carbon Dioxide + Energy (break down by yeast) 1 of 3 Biogas 70% methane 30% carbon dioxide Fermentation of waste material in generator or digester at constant temp Batch Generators: small batches waste manually loaded Continuous Generators: producing all the time at steady rate large scale waste is constantly added - automatically By-products: Fertiliser Factors to consider when designing a generator: Cost - continuous more Covenience - batch needs maual labour to load Efficiency - temperature of 35 degrees (most efficient) Position - smelly - away from homes 2 of 3 Advantages of Bio fuels and Biogas carbon neutral less sulfur dioxide less nitrogen oxides methane not released cheap and readily available good fertiliser as by product uses waste that would other wise pollute e.g. sewage 3 of 3
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