Sewage recycling is still an interesting one, right? Although Chadwick and his zeal for flushing combined with water closets makes it effectively impossible to use sewage as an agricultural fertilizer. It's just that they're using in modern sewage treatment works a mixture of physics, chemistry and biology to remove the pollutants and turn the solids into a fertilizer again. And it will be interesting to see how far that can be taken, you know, from incineration, which is the London solution now rather than dumping it in the sand.

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