Kinetics And Reactor Design

For a completely mixed system, the rate constant can be calculated using the following relationship: where:
- is the hydraulic retention time,
- is the initial BOD concentration,
- is the concentration at time .
The total BOD reduction is 90 %, so the remaining BOD after treatment is 10 % of the initial concentration, i.e. . Thus, the equation becomes: Thus, the rate constant for BOD removal is .