| 摘要 |
PROBLEM TO BE SOLVED: To promote the activities of aerobic fermenting and decomposing bacteria.SOLUTION: In a circulation type simple flush toilet, which includes a biological treatment tank for receiving sewage from a flush toilet bowl and fermenting and decomposing organic matter in the sewage by aeration by aeration means and fermentation decomposition bacteria adhering or fixing to a medium object, a filter tank for solid-liquid separating the biologically treated water having undergone the biological treatment in the biological treatment tank, and a decoloring tank for decoloring filtrate water, solid-liquid separated in the filter tank, by blowing ozone gas into the filtrate water, and circulates the treated water having decolored in the decoloring tank to the flush toilet bowl as flushing water, the biological treatment tank has a plurality of aeration tanks partitioned from the upstream side to the downstream side, a singular or plurality of rotating contact carriers as a medium object are arranged in one of the aeration tanks, and a part of the rotating contact carrier is exposed in air. |
