O 2 I n l e t r a t e = 46.9 m g m i n × 1.2 m g O 2 m g B O D = 56.3 m g m i n {\displaystyle O2\ Inlet\ rate=46.9\ {\frac {mg}{min}}\times 1.2\ {\frac {mgO2}{mgBOD}}=56.3\ {\frac {mg}{min}}}