A smart sewer

Darcy Hitchcock

What humans do with their, um, waste hasn’t changed much since London built their first sewer in 1865. In the developed world, we flush, mix it with greywater from our showers, and sometimes even mix it with rainwater. And then we try to clean and separate the pungent brew.

But what if we could separate pee and poo and use it as fertilizer or biofuel. What if we could capture the waste heat in the sewer to heat our buildings. What if we could reuse the water to drink. What if your toilet could alert you to medical problems? These aren’t what-ifs. They’re happening now.

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