The following tracer data were collected for a treatment reactor where 99% removal of a toxic pollutant is required. Given a first-order reaction relative to the pollutant concentration, what must be the minimum reaction rate constant for this process in (1/min)? Enter it below. Determine the dispersion number assuming a closed-flow system. You may approximate the hydraulic detention time with the mean residence time. 14 0 0 35 12.6 8 29.4 30 12 30.8 16 27.2 25 20 21.5 25 16.8 20 30 12.7 35 9.9 15 45 4.7 60 1.3 10 time, min conc, mg/L 5 0 0 10 20 30 40 40 50 60 60