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प्रश्न
How is sewage water treated?
उत्तर
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.
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संबंधित प्रश्न
Multiple Choice Type:
The most convenient reusable wastes are
Give a reason for the following :
Landfills are coming up fast near large cities.
What are the measuress adopted to prevent the spread of disease from sewage water?
Why should we not bum dried plant leaves and husk? What is the best way to get rid of them?
Municipality provides two types of dustbins for garbage collection. One coloured with blue colour and other with green colour. From following wastes which you will put in the which dustbin?
Plastic materials, metals and glass items, wastes of plants and animals, peels of fruits and vegetables, dried leaves and twigs, remains of meat like flesh and bones.
Discuss:
Is it possible to reduce the problems relating to disposal of garbage?
What happens when
Insecticides, motor oil, paints are poured down the drain.
What happens when
Tea leaves, cotton swabs and old soft toys are thrown into the drain.
One of the best solutions to get rid of non-biodegradable wastes is ______.
