A batch reactor and a PFR are operating side by side with the same influent waste stream. The batch reactor operates on a two-hour cycle (all in and all out), and the PFR receives the waste stream as a constant flow and operates in steady state. The first-order reaction rate coefficient for both reactors is 0.26 hr-1. The flowrate through the 72 m3 PFR is 36 m3/hr. The effluent concentration from the PFR is:
