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What is waste water released from homes commonly known as?
 

Nitin has recently learned about waste water treatment in his school. His mother took him to a waste water treatment facility. He discovered that waste water containing cans, plastic bags, pebbles, faeces, and rags was moving within the wastewater in treatment plant. The worker said that after a few steps, all pollutants would be eliminated, and the water will be used for other activities.

Answer the following questions:

a) Which part of a wastewater treatment plant removes large objects like cans, plastic packets and rags?

b) How pebbles are removed?

How much percentage of wastewater globally remains untreated?

The diagram shows a typical wastewater treatment process.

What can be concluded about wastewater treatment process from the diagram?

The diagram shows a typical wastewater treatment process.

What makes the residue from sludge digestor suitable as organic manure.

Which of these diseases can be caused by polluted water?

Mohith is a class 7 student, and he is flying with his parents for the first time. After sometime of the flight takeoff, he felt the need to use the restroom, but the thought of human excreta falling outside over someone's body made him feel uncomfortable. He shared this thought with his parents. They conveyed him that in aeroplanes a special type of toilets are used, and the excreta doesn't fall onto the ground. Finally, he agreed to go washroom.

What type of toilets are suitable in aeroplanes? 

How sanitation can be maintained at public places?