Sewage system with reusable flush medium

Claim 1

A sewage system for separating sewage waste from a flush medium so the medium can be reused, comprising: a non-aqueous liquid flush medium for receiving and transporting sewage waste, the flush medium having a specific gravity less than that of water, a separating tank for receiving sewage waste being transported by the flush medium, the flush medium separating from the waste upon entering the separating tank and floating on the waste due to its different specific gravity whereby an upper flush medium containing section and a lower waste containing section are established in the separating tank with an intermediate interface, flush medium outlet means positioned in the upper section of the separating tank for allowing flush medium to flow from the separating tank when it reaches the level of the flush medium outlet means thereby controlling the volume of the flush medium retained in the separating tank, a first waste receiving tank connected to the lower waste containing section of the separating tank for allowing waste to flow therefrom into the first waste receiving tank, waste outlet means positioned in the first waste receiving tank for allowing waste to flow from the first waste receiving tank when the waste reaches the level of the waste outlet means thereby controlling the volume of the waste retained in the first waste receiving tank and in the separating tank, whereby the retained volumes are held substantially constant in both tanks due to the two outlet means and whereby the interface in the separating tank remains at a substantially constant level below the flush medium outlet means thereof even with the periodic receipt of additional flush medium and sewage waste by the separating tank.