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John Snow
Used Dot Map to illustrate the cluster of cholera cases around the pump.
Jean-Louis Mouras
Credited for the first septic tank, which has originated in France in 1895.
Sir Edward Frankland
One of the commission members; Developed trickling filter sand technology, 1868
Edward Ardern and William Locket
Developed activated sludge in England in May 3, 1914.
John Kjeldahl
Developed the original TKN method.