Ethonal Production From Kelp Fermentation And Its Environmental Significance

Facing to the increasing depletion of fossil fuels and the emissions of carbon dioxide caused by the excessive combustion of the fossil fuels, to find a new alternative bio-energy has become a global goal. Bio-ethanol, as a fuel, is a clean and renewable energy sources. It has the advantages of energy saving and environmental protection. At present, the production of bio-ethanol usually uses main crop as the raw materials. The rapid development of bio-ethanol will use a lot of agricultural products, so that will make prices of agricultural products closely be linked with energy prices and thus lead to higher prices of agricultural products, food security issues. Kelp is a kind of water organisms with wide distribution. In the light conditions, cells can use carbon dioxide and water to synthesize organic substances with the containing chloroplasts, which can be used for microbial fermentation to produce ethanol.In this paper, kelp from Zhoushan sea is used as raw materials and Saccharomyces cerevisiae is used as microorganisms for fermentation. Firstly through the seaweed and brewing raw material chemical composition analysis of micro-organisms, and then by studying the yeast culture and fermentation processes, Saccharomyces cerevisiae culture growth kinetics model with the seaweed extract bio-ethanol process has been established, and several factors control the environmental impact has been studied.The experimental results show that the polysaccharide in the kelp is essentially combined with rhamnose, alginic sugar, arabinose, xylose, mannose, glucose, galactose and myo-inositol 8 kinds of monosaccharide composition. Among them, the highest content of sugar is alginic sugar and myo-inositol, accounting for the total sugar content of 43%. In the expansion cultivation process of Saccharomyces cerevisiae, through the determination of generation time of yeast, Saccharomyces cerevisiae was found the optimal experimental incubation temperature of 28～30℃, optimum pH of 5.5～6.5.To control the temperature30℃-35℃, pH=6-7 and fermentation time for 6-7d, access to the largest ethanol production rate; the phosphorus acid and magnesium ion concentration in yeast culture medium on the optimum nutrition for the 3g/L and 1.5g/L. Through the research of production, fresh dried kelp seaweed pretreatment, selection and expansion of cultivation of Saccharomyces cerevisiae, fermentation equipment, and fermentation medium sterilization, into the tank fermentation, and ethanol pretreatment liquid extraction and purification of the 11-step process steps was found which can better realize the purpose of producing bio-ethanol fermentation. This is not only provides important technical parameters for the use of seaweed fermentation ethanol production, but also to open up a new algae bio-energy has far-reaching practical significance.