B O D l o a d i n g = 3.75 k g d a y × 1000 2 ÷ 24 h r s d a y ÷ 60 m i n h r s = 2 , 604 m g m i n {\displaystyle BOD\ loading=3.75\ {\frac {kg}{day}}\times 1000^{2}\div 24\ {\frac {hrs}{day}}\div 60\ {\frac {min}{hrs}}=2,604\ {\frac {mg}{min}}}