12. Degradation rates for a pollutant experiencing zero-order degradation in an ideal plug flow reactor at steady state a. are constant throughout the reactor volume. b. vary in space throughout the reactor. c. are proportional to the influent pollutant concentration. d. are proportional to the pollutant concentration within the reactor. 13. The overflow rate, OFR (m/d), of a sedimentation basin that is 3.8m deep, holds 6500m3 of water, and is treating a flow of 28 MGD is approximately a. 4.4m/d b. 16m/d c. 24m/d d. 62m/d e. 124m/d