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(A) The process of sewage treatment in $STPs$ (Sewage Treatment Plants) occurs in the following sequence:$1$. Primary treatment involves physical remo

Vedclass · Accepted Answer

Primary sludge $\rightarrow$ Effluent $\rightarrow$ Flocs $\rightarrow$ Activated sludge $\rightarrow$ Biogas

Vedclass · Answer

(A) The process of sewage treatment in $STPs$ (Sewage Treatment Plants) occurs in the following sequence:$1$. Primary treatment involves physical removal of particles through filtration and sedimentation,resulting in the formation of $Primary \ sludge$ and $Effluent$.$2$. The $Effluent$ from primary settling tanks is taken for secondary treatment (biological treatment).$3$. In the aeration tank,aerobic microbes grow to form $Flocs$ (masses of bacteria associated with fungal filaments).$4$. These $Flocs$ consume the major part of organic matter,reducing the $BOD$ of the effluent.$5$. The sediment formed after secondary treatment is called $Activated \ sludge$.$6$. $A$ small part of this $Activated \ sludge$ is pumped back into the aeration tank,and the remaining major part is pumped into large tanks called $Anaerobic \ sludge \ digesters$,where anaerobic bacteria produce $Biogas$.Therefore,the correct sequence is $Primary \ sludge \rightarrow Effluent \rightarrow Flocs \rightarrow Activated \ sludge \rightarrow Biogas$.

Which option represents the correct sequence of components formed during the process of sewage treatment in $STPs$ until biogas is produced?

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