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How is Sewage Water Treated? - Biology

Short Note

How is sewage water treated?

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Solution

Sewage water is treated in three steps:
(i) Primary treatment - In this, the coarse and fine suspended , solids are removed by sedimentation, coagulation and precipitation.
(ii) Secondary treatment - It is essentially a biological treatment process which involves the removal of colloidal and dissolved organic substances and some toxic chemicals.
(iii) Tertiary treatment - Here, excess nutrients are removed to allow the reuse of that water.

Concept: Domestic Waste
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APPEARS IN

Frank Class 9 Biology ICSE
Chapter 23 Safe Disposal of Wastes
Exercise | Q 5 | Page 212
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