The following is a brief description of the ZERO-H²O toilet concept as well as its main features.
The human excrement falls down a vertical chute (2) and into one end of a specially designed helical screw conveyor (3). Every time the toilet lid (1) is lifted, a mechanism rotates the conveyor.
With each rotation the human excrement slowly moves along, taking approximately twenty-five days before falling into a reusable collection bag (4).
It takes six months for the bag to fill with dry and odourless waste.
Through the uniquely designed ventilation pipe (5), adequate airflow is provided for the dehydration / evaporation, deodorizing process.
Human excrement consists of roughly 95% moisture. As the solids dry in the conveyer the urine and moisture is vented into the atmosphere. The solid waste then dries into a compost-like material, roughly 5 – 10% of its original mass.
The dry waste is manageable and can be processed in the following ways.