Can aerobic tank sludge be replenished from secondary sedimentation tank?

Can't make up from the secondary sedimentation tank. Aerobic pool sludge is a special biofilm, which can simultaneously complete the process of bacterial decomposition of organic matter and removal of pollutants. The secondary sedimentation tank is a mixed solution of activated sludge, which has the characteristics of high concentration (2000-400mg/L), flocculation, light weight and slow sedimentation rate. Because of its different characteristics, it cannot be replenished from the secondary sedimentation tank. Aerobic tank and secondary sedimentation tank are a sewage treatment system.