Isn the purpose of spreading sludge on the land the creation of a sustainable cycle between city and country?
Sludge can never be part of any sustainable cycle since it contains unsustainable and unpredictable levels of heavy metals and toxic substances/compounds. The metals present in non life-compatible concentrations and amounts in sludge accumulate in the soil until–sooner or later–they reach levels toxic to plants and animals including, of course, humans. This is an unresolvable system error stemming from the central collection and mixing of heterogeneous waste materials and water.
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