Q (m3 / h) |
Flow - rate |
Qo (m3 / h) |
Influent flow - rate |
Qe (m3 / h) |
Effluent flow - rate |
Qr (m3 / h) |
Recycled sludge flow - rate |
Qw (m3 / h) |
Wasted sludge flow - rate |
BOD (mg / L) |
Biochemical oxygen demand |
BODo (mg / L) |
Influent biochemical oxygen demand |
Va (m3) |
Aeration tank volume |
SS (mg / L) |
Suspended solids (SS) |
SSe (mg / L) |
Effluent SS |
SSr , w (mg / L) |
Recycled and wasted sludge SS |
A (m3 / h) |
Air flow - rate |
MLSS (mg / L) |
Mixed liquor suspended solids |
t (h) |
Hydraulic retention time |
OL (kg BOD / m3 . day) |
Organic loading |
F / M (kg BOD / kg MLSS . day) |
Food to microorganism ratio |
r |
Recycle ratio |
SA (day) |
Sludge age |
ASR (m3 / kg BOD) |
Air supply rate |
E (%) |
BOD removal efficiency |