Waste water can be combined in one single pipe with kitchen-shred organic waste including food-waste from all floors of an existing building.
The liquid fraction of this combined waste water can be separated from the solid fraction with a separation unit using centrifugal force and gravity. The liquid fraction can be treated with NBS indoor, at facade and outdoor with a minimum energy cost (<1.5 kWh/m3) and allowing >95% water reuse. The effluent water can be further be disinfected (by using O3/UV) and used for toilet flushing, urban gardening and compost production. The solid fraction can be used for biogas production in a dry anaerobic digestion unit (Solution 8).
The feasibility of this water treatment solution will be demonstrated at laboratory and pilot scale.