同©大学 Tongji University (1)History of the filtration Filtration is an ancient technology for cleaning water Sand and gravel filters used in India as early as 2000 B.C. Romans dug channels next to lakes to use natural filtration French began filtration around 1750 on small scale Filtration for municipal supply systems began in England and Scotland around 1800 First modern slow sand filtration system in London in 1829 Rapid filtration began in US in 1880s Rapid filtration began in China about 1895 in Shanghai)Tongji University (1) History of the filtration Filtration is an ancient technology for cleaning water • Sand and gravel filters used in India as early as 2000 B.C. • Romans dug channels next to lakes to use natural filtration • French began filtration around 1750 on small scale • Filtration for municipal supply systems began in England and Scotland around 1800 • First modern slow sand filtration system in London in 1829 • Rapid filtration began in US in 1880s • Rapid filtration began in China about 1895 ( in Shanghai)