METHOD FOR PREPARING METHANE GAS USING RED ALGAE EXTRACT

摘要

The present invention relates to use of a red algae extract for preparing methane gas, generated during a pulp manufacturing process using red algae. More specifically, the present invention provides a method for directly preparing methane gas from red algae extract and a method for preparing methane gas using distillery wastewater remaining after ethanol preparation from red algae. The direct method for preparing the methane gas comprises: (a) a step of hydrolyzing red algae extract; (b) a step of removing impurities from red algae extract from step (a); and (c) a step of performing methane fermentation of the extract obtained through step (b) using methane-fermenting fungi. The other method for preparing methane gas using distillery wastewater comprises: (a) a step of hydrolyzing red algae extract; (b) a step of removing impurities from red algae extract from step (a); (c) a step of neutralizing the pH of red algae extract obtained through step (b); (d) a step of inoculating distiller's yeast to red algae extract from step (c); (e) a step of performing alcohol fermentation of red algae extract from step (d); (f) a step of distilling alcohol fermentation liquid obtained through step (e) and collecting ethanol; and (g) a step of performing methane fermentation of distillery wastewater remaining after collecting the ethanol from step (f) using methane-fermenting fungi.