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4.4.2 Sewage / waste water Treatment
Waste water that is water after being used is called sewage. Sewage includes household water, toilet wastes, industrial wastes and rain water. Sewage has to be treated before it is discharged into rivers and sea. Sewage treatment is done in three steps, namely: Primary Treatment, Secondary Treatment and Tertiary Treatment. |
Last modified: Tuesday, 8 November 2011, 10:14 AM