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Subjects
Science State Board
Class 9
Environmental Science
Adaptation in plants, animals and conservation of water
19.
Wastewater treatment stages and steps
Exercise condition:
5
m.
Match the Column A with Column B
:
Column A
Column B
1
.
Heavier solid settle at
Float over the surface
Settling tank
Bottom
2
.
Primary treatment principle
Gravity
Biodegradable dissolved organic matter
Biological oxidation
Secondary treatment
3
.
Tertiary treatment
Biological treatment
Advanced treatment
Physical treatment
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