Multi-unit flush system having carbon adsorber column in calcium carbonate bed

Claim 1

A flushing water-circulation type flush system comprising: a toilet, a water reservoir above the toilet and connected to it, an anaerobic filter-bed unit, a sewage pipe extending downwardly from the toilet to the upper portion of said filter-bed unit, a layer of filter-bed material in said filter-bed unit and located approximately at the mid-depth thereof with the bottom of said layer of filter-bed material above the bottom of said filter-bed unit, a contact aeration unit having contact material therein approximately at the mid-depth thereof, and having means therein for circulating material from below said contact material to above said contact material, means including a delivery pipe for providing a fluid flow path from below said filter-bed material in said filter-bed unit to above said contact material in said contact aeration unit, a settling unit adjacent to said contact aeration unit, a partition wall between said settling unit and said contact aeration unit, said partition wall being open at the bottom of said contact aeration unit and said settling unit for providing communication therebetween, a pH regulation unit adjacent said settling unit having pH regulation material therein comprising a source of calcium carbonate, a vertical cylindrical adsorber in said pH regulation unit, extending through said pH regulation material and containing activated carbon therein, a partition wall separating said settling unit and said pH regulation unit having a port therein near and spaced from the top thereof for providing communication between said settling unit and said pH regulation unit, a circulation unit adjacent to said pH regulation unit comprising means for circulating sewage material from the bottom of said circulation unit to the top of said adsorber including means for supplying air thereto, means comprising an outflow pipe for transferring sewage from the bottom of said adsorber to the top of said circulation unit, sterilizing means for receiving water from said circulation unit and for sterilizing wastes, a flushing water unit for receiving sterilized water from said sterilizing means, and means including a pump for conducting water from said flushing water unit to said water reservoir for recycling flushing water from said flushing water unit to said water reservoir.