To provide a non-effluent type water-circulating simplified water closet which hardly generates a malodor, dispenses with frequent resupply of flushing water, also dispenses with measures against the freezing of the flushing water at midwinter, simplifies a treatment system, and can obtain colorless and transparent treated water.

This non-effluent type water-circulating simplified water closet includes: a means for washing away soil in a toilet bowl with water; a reception tank for receiving the soil water; an aeration tank which has an inside bottom provided with an aeration means and a porous material with fix-planted bacteria, and which decomposes the soil water, flowing in from the reception tank, by the action of the bacteria; a filtration tank which filters the soil water, overflowing from the aeration tank, by making the soil water pass through the porous material; a sterilizing tank which obtains the treated water by sterilizing the soil water after filtration; and a water supply tank for storing the obtained treated water. In addition, the at least one tank selected from a group of the reception tank, the aeration tank and the filtration tank is provided with a warming means for warming the soil water inside the selected tank.

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