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Urban Fish Ponds: Low-tech Sewage Treatment for Towns and Cities

'In the mid 20th century, whole cities’ sewage systems safely and successfully used fish to treat and purify their water. Waste-fed fish ponds are a low-tech, cheap, and sustainable alternative to deal with our own shit — and to obtain high protein food in the process. '

solar.lowtechmagazine.com/2021

so, a degrowth society is one where everbody gets to eat tilapia multiple times a week?

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@rra that is interesting ... at least for small communities that control their waste if they can guaranty there is only biological waste in the water ...

nowadays in most western cities there is so much chemicals (like soaps and solvents) , plastics and metals (as in paints etc) that hyacinths are probably not enough and you will only grow dead fishes in the sewers :/
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that is a certain turn in mentality to make too (sewer pollution)

@rra reg. pollution : in Brussels, this organization is doing events and projects around the "water as a common" : https://www.egeb-sgwb.be/
one of their actual project (since some times actually) is how to measure water quality in the city

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