CLOSED LOOP WASTE TREATMENT AND WATER RECYCLING TOILET SYSTEM AND METHOD OF OPERATION

摘要

A closed loop waste treatment and water recycling toilet system and method of operation in which waste is flushed from a toilet stage (21) into a treatment zone in which organic materials are removed biologically with purified water therefrom being recycled as flush liquid in the toilet stage (21). In order to provide effective management of nitrogen and to slow build-up of solids in the system the flushed waste liquid is passed to an anoxic station (14) where oxidised nitrogen compounds are broken down to produce nitrogen gas and bicarbonates, the liquid passes from the second stage to a third aerobic stage (16) containing biological active solids in which ammonium compounds are nitrified to oxidised nitrogen compounds at the same time as organic materials are removed by bacteria. The mixed liquid containing nitrates is transferred from the third stage (16) to a fourth stage (17) in which the liquid is filtered to provide liquid containing oxidise nitrogen compounds and free of bacterial sludge which is returned via a disinfection stage as flushing liquid to the toilet stage (21).