METHOD FOR PRODUCING LACTIC ACID/SUCCINIC ACID FROM RICE STRAW AND THE LIKE WITH HIGH EFFICIENCY, AND METHOD FOR PRODUCING GYPSUM-BASED SOIL IMPROVERS/BUILDING MATERIALS

摘要

PPROBLEM TO BE SOLVED: To provide a method for producing an organic acid necessary, for example, for the production of biodegradable plastics from agriculture and forestry wastes such as rice straw with high efficiency, and a method for producing gypsum-based soil improvers/building materials. PSOLUTION: Agriculture and forestry wastes such as rice straw, wheat bran, and waste wood are pulverized. Thereafter, the powder is saccharized with sulfuric acid, followed by the addition of calcium carbonate or calcium oxide for neutralization. Any one of three microorganisms, i.e., Bacillus coagulans, Streptococcus salivarius, and Kluyreromyces thermotolerans, is inoculated into the saccharified solution, and the mixture is cultured for the production of lactic acid. At the same time, "biomass residue containing a large amount of gypsum" produced by solid liquid separation after the neutralization is utilized, e.g., soil improvers for salt accumulation soil and the like, composting materials, or building gypsum materials. PCOPYRIGHT: (C)2007,JPO&INPIT