Activated Sludge Process

In 1912, the British Clark and Cage discovered that long-term aeration of wastewater would produce sludge and significantly improve water quality. Later, Arden and Lackett conducted further research and found that because the experimental container could not be cleaned thoroughly, the residue left on the bottle wall instead improved the treatment effect, thereby discovering active microbial zoogloea, which was named activated sludge.

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