Before the invention of the activated sludge process in 1914, what were the primary methods used for managing wastewater solids?
Answer
Physical removal and passive open-air digestion
Historical sludge management relied primarily on physical separation techniques such as gravity settling. The resulting material was then often subjected to passive, open-air digestion on large drying beds. These early methods were slow, prone to causing odors, and required extensive land usage to handle the volume of waste produced by even moderate-sized urban populations.
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