| abstract |
A method for producing an organic acid necessary for producing biodegradable plastic from agricultural and forestry waste such as rice straw with high efficiency and a method for producing a gypsum-based soil improvement material and building material are provided. SOLUTION: Agricultural and forestry wastes such as rice straw, wheat bran, and waste wood are pulverized and then saccharified, and then neutralized by adding calcium carbonate or calcium oxide to saccharified liquid. Bacillus coagulans, Streptococcus・ Lactic acid production by inoculating and culturing any of the three types of Sullibaris (Streptococcus salivarius) and Kluyeromyces thermotolerans, and at the same time, "gypsum generated by solid-liquid separation after neutralization" Is used as a soil improvement material for salt accumulation soil, composting material, or gypsum material for construction. [Selection figure] None |