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
Give Technical Terms:
Any non-biodegradable pollutant.
What are Composting ? Explain its Process
Discuss:
Is garbage disposal the responsibility only of the government?
First link in any food chain is usually green plants because ______.
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?
The steps required for conversion of kitchen garbage into manure are given below in a jumbled form.
- Put garbage in a pit
- Cover the bottom of the pit with sand
- Cover the pot loosely with a gunny bag or grass
- Add worms
Which of the following shows the correct sequence of the above steps?
Correct the definition of certain terms given below by changing only one word.
Compost: Substances converted into manure for use in industries.
Beera, a farmer would clear his field everyday, and burn dry leaves fallen on the ground. After sometime he found that those living in huts near his field were suffering from cough and breathing problems.
- Can you explain why?
- Also suggest an environment friendly way to dispose the dry leaves.
Some wastes are given below:
- Garden waste
- Ball point pen refills
- Empty medicine bottles made of glass
- Peels of fruits and vegetables
- Old cotton shirt
The non-biodegradable wastes among these are ______.
Define the following term:
Pollution
