Mean Cell Residence Time. An expression of the average time (days) that a microorganism will spend in the activated sludge process.
NOTE: Operators at different plants calculate the Total Suspended Solids (TSS) in the Activated Sludge Process, lbs (kg), by three different methods:
- TSS in the Aeration Basin or Reactor Zone, lbs (kg)
- TSS in the Aeration Basin and Secondary Clarifier, lbs (kg)
- TSS in the Aeration Basin and Secondary Clarifier Sludge Blanket, lbs (kg)