Study On The Bioenergy Production From Macroalgae (Kelp) Fermentation

Fossil energy will be unavailable in near future and it definitely worsens the environment we lived. Thus, seeking new bioenergy has become a global goal. Macroalgae (klep) is generally thought to be a third generation of bioenergy raw material with great potential. And it is a renewable resource with no need of excess land use and freshwater, furthermore, the utilization itself is eco-friendly.In my research, Laminaria japonica was chosen as raw materials to produce ethanol and biogas. As for ethanol fermentation experiment, three methods of acidified, homogenized and digested preprocessing are compared and analyzed, and then further fermented by Saccharomyces cerevisiae and Angel Distiller’s Yeast. The experiment of biogas fermentation, Angel Distiller’s Yeast, living and dyeing sludge are discussed the good or bad. The influencing factors and optimization of the both of ethanol and biogas fermentation experiments are determined. The results are as follows:1. The content of reducing sugar and total sugar could be increased by adding Na2O3during pretreatment. The digestion temperature has more effect to the total sugar content than the reducing sugar content. Angel Distiller’s Yeast is more suitable for fermentation than Saccharomyces cerevisiae. And filtration will go against a higher concentration of ethanol. Through the optimization test, it is found that, among the factors affecting the ethanol production, initial pH of fermentation is the most remarkable one, with fermentation temperature and initial kelp concentration come second, the influence of the volume of fermentation, however, is relative small. Specifically, a yield of4.09g ethanol per100g kelp can be achived under the optimal fermentation condition:temperature of34℃, initial pH of6.5,200mL fermentation liquor and kelp concentration of1.5g/100.2. As for biogas fermentation process, the experimental results show that the gas-production yield with utilization of living sludge is highest in this experiment, with dyeing sludge come second and Angel Distiller’s Yeast is poor. Temperature, unlike the pH value of chosen range, has great influence on the biogas in my experiment, while the increasing of total of biogas is mostly attributed to increasing kelp content.This work provides scientific basis and technical support for finding an operational method in bioenergy production from kelp fermentation.