Advertisements
Advertisements
प्रश्न
How is sewage water treated?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Which of the following is the best method to dispose of biological wastes from hospitals?
(a) landfill
(b) recycling
(c) incineration
(d) composting
What are Composting ? Explain its Process
Choose the correct option:
Landfill are is a/an:
Do you think it is better to use compost instead of chemical fertilizers? Why?
Which of the following is the best way for disposal of vegetable and fruit peels?
A garbage collector separate items mentioned below in the garbage into red, green and blue containers for their transfer to landfill, composting pit and recycling unit respectively.
Items:
- Plastic bags
- Newspaper and journals
- Screw and nuts
- Vegetable peels
- Metal chips
- Egg shells
Which items were transferred to which bin?
To what use can you put the following kind of garbage and how?
Dry leaves collected in a garbage
What happens when insecticides, motor oil, paints are poured down the drain?
List two classes into which garbage is classified.
Define the following term:
Pollution
