A reaction that proceeds by first-order irreversible kinetics is oxidizing chemical A in a wastewater treatment basin with a mean residence time of 1.5 hours. The reaction rate constant is 2.0 hr-1. The basin is unbaffled and may be characterized as two completely mixed tanks in series. If the steady-state influent concentration is 30 mg/1, find the effluent concentration. If baffles are placed in the basin so that the basin may be characterized as four completely mixed tanks in scries, and the mean residence time remains constant, find the effluent concentration.
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