Design a plug flow reactor $($PFR$)$ to remove a pollutant from a waste stream with a

flow rate of $11,300$ L$/$day$.$ Laboratory batch reactor tests indicate that the pollutant

degrades according to a rate constant $k=0\mathrm{.}35$ day ${?}^{-1}.$ Regulations mandate that

$99\mathrm{.}5\%$ of the pollutant must be removed in the reactor before the waste stream is

discharged.

a$.$ What is the order $n$ of the reaction kinetics

b$.$ What is the minimum hydraulic retention time for PFR$?$

c$.$ What will be the PFR volume required to treat this waste stream?