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並前往http://civil.colorado.edu/~silverst/cven5534/History%20of%20Wastewater%20Treatment%20in%20the%20US.pdf

History of Wastewater Treatment in the US.pdf

Early 1900s, 1 million people served by 60 sewage treatment plants for removal of settling and floating solids. TREND: population growth and sewer construction.

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