wastewater story class 7

when is the world water day celebrated ?

• 13 september

• 2 october

• 22 march

cleaning of water is a process of removing contaminants from the wastewater, which is commonly known as -----------

The dirty water or the uncleaned water that comes from the houses, factories, offices etc.. is commonly known as ..

• blue water

• wastewater

• sewages

Tags

NGSS.MS-ESS3-4

organic impurities contain-

• human faeces , animal waste, oil, urea.

• nitrates, phosphorus, metals.

• vibro cholera

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS1-5

the pipes which carry the dirty water are known as -

large objects like rugs, napkins, plastic bags are removed by using ?

• bar screens

• sludge

• aeration

the grit and sand remover tank removes___________________

human excreta and urea are removed by

• sludge

• bar screen

• sea beds

the skimmer removes oil and grease

• True

• False

Tags

NGSS.MS-ESS3-3

the anaerobic bacteria releases ozone gas

• TRUE

• FALSE

Tags

NGSS.HS-LS2-3