by ilmungo
Sewage Treatment Plant In India
In the industrialised countries the first water treat- ment techniques involved processes of a purely physical and mechanical nature to reduce the solid content. 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 treatment were
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