APPARATUS FOR ANAEROBIC TREATMENT OF SEWAGE

摘要

PURPOSE:To perform the high capacity anaerobic treatment of sewage by propagating a granular propagating body of methane producing bacteria from digested sludge by forming an unstirred zone having specific volume between the stirring blade in a reactor main body and the inner wall of the bottom part of the reactor main body. CONSTITUTION:Sewage upwardly flows through the sludge bed in a reactor main body 1 to receive the decomposition of org. matter due to anaerobic bacteria during the passage through the sludge bed to be purified and flows out of a purified water outflow pipe 3 as treated water. A stirring blade 5 is provided in the reactor main body 1 so as to be speced apart from the inner wall 9 of the bottom part of the reactor main body 1 by a predetermined distance and an unstirred zone 8 having volume 8 - 30% the volume of the main body is formed under the stirring blade 5. By this constitution, the outflow of methane producing bacteria is suppressed to the min. in the unstirred zone 8 and the granular propagation body of said bacteria is actively formed. Therefore, the granular propagation body and sewage supplied from the unstirred zone 8 are efficiently stirred and mixed in the stirring zone 10 due to the stirring blade 5 and the decomposition of org. matter is accelerated.