Ecobot III is a self-sustaining machine with an artificial gut.

Researchers at the Bristol Robotics Laboratory, UK have created a self-sustaining robot with an artificial gut to allow it to power itself by eating and excreting. The Ecobot III eats partially processed sewage and uses its nutrients as fuel and excretes the rest, while also drinking water to continuously generate power.

Physorg describes its digestion process and how it generates power for itself:

The robot navigates towards a dispenser filled with the nutrient-rich mixture and “eats” what it needs. The meal is then processed in the robot’s body by bacteria held in a stack of two tiers, each with 24 microbial fuel cells (MFCs).

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