| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide both a method for producing a compost in which noxious microorganisms are killed and an apparatus for pressurizing and kneading treatment used therefor. SOLUTION: A compost raw material charged into a pressurizing and kneading treatment tank is pressurized and kneaded with a forced feeding screw for forming mutually opposite internal and external two-layer flows in the forward direction and retreating directions. Thereby, tissue surfaces of microorganisms are broken in a process for circulating a part of the raw material heated up by the pressurizing and kneading in the forward direction in the treatment tank while pressurizing and kneading the raw material in the retreating direction and the resultant microorganisms in the raw material are made to stay at >=70 deg.C temperature for >=1 min and killed. A fermenting microorganism is added to the resultant raw material in which the microorganisms are subjected to killing treatment and fermented while pulverizing the raw material, bringing the pulverized raw material into contact with air and cooling the raw material. For that purpose, the forced feeding screw has a structure in which forward screw blades 11 and a retreating screw blade 12 are fixed to a common rotating shaft so as to form internal and external double coaxial blades.</p> |
