Secondary sewage treatment is mainly a

MCQ

✓

Answer

Correct option: D.

Biological process

d
Secondary treatment of the liquid effluent from the primary settling tank is purely a biological treatment involving microbial activity

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Plant $→$ Insect $→$ Frog $→$ “$A$” $→$ Eagle

$A.$ Detrivores perform fragmentation.

$B.$ The humus is further degraded by some microbes during mineralization.

$C$. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.

$D$. The detritus food chain begins with living organisms.

$E$. Earthworms break down detritus into smaller particles by a process called catabolism.

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