| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an anaerobic digestion tank which has smaller height diameter ratio of a tank than conventional one, and further can stably treat organic wastewater and sludge with solid content of higher concentration than the conventional one by improving the uniformity of stirring the liquid to be treated. SOLUTION: This anaerobic digestion tank is provided with a tank for holding the liquid to be treated including organic substances and fermenting and decomposing the organic substances, and rotating blades with a rotating shaft at the center of the tank for automatically stirring the liquid to be treated, the rotating shaft is provided with double rotating blades vertically separated from each other, and at least an upper rotating blade is formed as a fluid driving blade for causing a down flow of the liquid to be treated at the center part of the tank.</p> |
