WorksheetsWastewater Story Class 7 Quiz
Total questions: 15
Worksheet time: 8mins
Anaerobic bacteria are added in the digester tank to decompose the organic matter to produce
biogas
Foul smell
sludge
sewage
The organic impurities present in sewage are
Bacteria
phosphorus
human faeces
Nitrates
Adopting good ________ practices should be our way of life
eating
Sanitation
reading
nome of these
Floating impurities (such as grease and oils) in the sedimentation tank are removed by
Screens
skimmer
Cleaner
floater.
Sewage treatment process involve
Removal of solid material
Sedimentation
Aeration of clarified water
All of these
Waste water is treated in a (a) .
The sludge is decomposed by (a) bacteria.
Sewage is a (a) waste.
We can disinfect water with chemicals like _________ and ________.
(a)
A (a) is a covered hole in the ground above the sewer pipelines.
what are the by-products of WWTP ?
(a)
A plant which can absorb waste water rapidly and release pure water vapor to the atmosphere.
Sunflower
Rose
Eucalyptus
Lily
Solid waste extracted in sewage treatment
a) human waste
b) animal waste
c) both a and b
d) none of these
what are the onsite sewage disposal system for human waste
septic tanks
composting pits
vermi-composting toilets
all of these
What is happening in this image ?
Large objects are getting removed with the help of bar screens
waste is getting settled down in sedimentation tank
biogas is getting produced
none of these
