A couple shows how animal waste can be used to sustain a small community.

An agronomist couple in Peru is using guinea pig waste to power their home and farm. The couple breeds 1,000 guinea pigs on the farm and use some of their droppings to produce methane that provides electricity for their home. The remaining byproducts of the animals are used as compost for the farm.

With the guinea pigs being fed a special diet of enriched plant waste matter, the process becomes an elegant, self-sufficient system.

Wandering Gaia explains the process:

The small dry pellets that the rodents poo out are fed into a bio-digester that Ulises adapted from a Chinese model – water is added and bacteria metabolise the slurry – to produce methane gas and a dark brown liquid plant nutrient, which he calls ‘Caca Cola’.

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