| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a self-closed type flush toilet periodically setting a decompo sition tank to an eutrophic state and an eligotrophic state, suppressing the occurrence of excess sludge, removing soluble organic matters, and preventing the processed water from being colored or from generating a malodor. SOLUTION: An excreta storage tank 11 is provided between a flush toilet stool 1 and a decomposition tank 2 to stare excreta. Since the excreta are sent to the decomposition tank 2 and decomposed in an aerobic state according to the capability of the decomposition tank 2, no sludge is generated in the decomposition tank 2, and a continuous operation can be achieved. A garbage storage tank 12 is provided, and garbage is processed in the decomposition tank 2 to reduce the discharge quantity of domestic refuse. Sewage is processed by a biological processing device such as an activated sludge processing tank or a biofilm processing tank, and the generated excess sludge is returned to the decomposition tank 2. The processed water is further purified in a advanced processing tank 5 and sent to fresh water tank 6 and stored. The water in the fresh water tank 6 is sent to the washing water tank 7 of the flush toilet stool 1 and used to wash the toilet stool 1.</p> |
