During which process are flocs formed?

Which of the following is placed into anaerobic sludge digesters for further treatment of sewage?

$A$ sewage treatment process,in which a portion of the decomposer bacteria present in the waste is recycled into the beginning of the process,is called

$A$: More sewage treatment plants are required in proportion to the human population.
$R$: Biogas,which is a fuel energy,is produced in $STPs$.

In large cities,domestic sewage ............

Identify the wrong statement regarding the process in sewage treatment.