by erin m
Sewage Treatment - Wastewater Treatment Plant
The limitations of both the results and the applicability of these processes later led to the use of treatments of a chemical nature. At the beginning of the 20th century water hygiene problems were over- come by adding chlorine. At the same time other types of Sewage Treatment were introduced, with specific objectives, such as rendering the water softer or re- ducing the iron content.
There has been a gradual progression fiom the
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