| abstract |
The invention discloses a method for producing sodium alginate and co-producing ethanol and a seaweed organic fertilizer. The method comprises the following steps of: with brown algae kelp serving as a raw material, pre-processing through cellulase and compound protease in an enzymolysis manner; decomposing cellulose in the kelp into microbially available monosaccharide and oligosaccharide in order to ferment to produce ethanol; preparing the seaweed organic fertilizer through the rest fermentation broth with little kelp residue; extracting and separating sodium alginate from the pre-processed kelp; and then performing a dilute alkali digestion technology and a calcium coagulating-ion exchange method to obtain high-quality sodium alginate. According to the method, the preprocessing is performed through bio-enzyme, and the main components, namely, cellulose, protein and the like in the kelp, are separated in advance through the cellulose and protease, thus high extraction rate of the sodium alginate is grained; simultaneously, wastes generated in processing are utilized to prepare a fuel, namely, ethanol; and the waste liquid and waste residues remained in ethanol preparation are utilized to prepare the seaweed organic fertilizer, therefore, high-valued utilization of the kelp is realized, and marine biomass energy is developed. |