NCERT Class 7 Science Chapter 18: Wastewater Story (NSO/NSTSE) | English

Dr. Manishika Jain explains NCERT Class 7 Science Chapter 18: Wastewater Story
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What are organic and inorganic impurities?
Differentiate Sewer and Sewerage.
Waste water from homes, industries, hospitals and offices
Dissolved and Suspended Impurities
Sewer - Network of pipes (from production to disposal); Manholes located 50 to 60 m
Organic impurities -Human faeces, animal waste, oil, urea (urine), pesticides, herbicides, fruit and vegetable waste, etc.
Inorganic impurities - Nitrates, Phosphates, metals.
Nutrients - Phosphorus and Nitrogen.
Bacteria - Such as vibriocholera which causes cholera and salmonella paratyphi which causes typhoid.
Other microbes - Such as protozoans which cause dysentery.
Wastewater Story @0:13 6
Brain Teasers @0:14
Sources of Wastewater @0:57
Cleaning Wastewater @2:19
Sewage @3:02
Organic Impurities @3:50
Inorganic Impurities @3:58
Nutrients @4:05
Bacteria @4:14
Industries @5:18
Treatment of Water @6:02
Waste Water Treatment Plant @7:01
Bar Screens for large Plastics and Cans @7:07
Grit and Sand Removal Reduce Speed @7:22
Solid Faces Settle on Bottom and is removed by Scraper @7:49
Aerator @8:48
Cover Open Drains @9:49
Alternate Arrangements @11:36
#Nutrient #Bacteria #Organic #Suspended #Impurities #Disposal #Potable #Aeration #Organic #Impurities #Sewage #Manishika #Examrace #NSO #NSTSE #Olympiad #NCERT #VVM #examrace #upsc #ugcnet

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