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After designer Archie Read developed a toilet that uses a conveyor belt rather than water to dispose of waste, here is a roundup of 10 innovative loos.

Solid waste is "flushed" away with a conveyer belt in the Sandi toilet, invented by recent Brunel University graduate Archie Read.

His design brief was to design and prototype a dignified waterless toilet solution for low-income countries, with the capacity to deal with excreta from a household of 7 adults for 2 days or 3kg of solid waste and 30 litres of liquid waste. The toilet should also offer adaptability in its storage/disposal method, have a maximum footprint of 1m x 0.6m and not cost more than $72 per unit. The proposed toilet should also be able to safely receive excreta from users, separate urine and faeces, use no water or chemicals, have mechanical functions, safely store waste, and allow easy retrieval/ trans...

The waterless toilet has a conveyor belt and a lever that pushes out the sand from its body and bowl into the storage below.