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Explain the Methods of Disposal of Liquid Wastes. - Biology

Answer in Brief

Explain the methods of disposal of liquid wastes.

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Most liquid wastes contain both dissolved and suspended matters. Treatment of such effluent involves the removal of contaminants and is done to prevent any adverse effects on receiving water or allow its reuse. Three steps are usually followed in the treatment of effluents:
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 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: Methods of Safe Disposal of Waste: Treatment of Effluents before Discharge
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Frank Class 9 Biology ICSE
Chapter 23 Safe Disposal of Wastes
Exercise | Q 9 | Page 212
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