The equations used in this program are very relevant for the prediction of effluent concentrations in water or wastewater treatment plants. Generally, an engineer knows what the influent concentration of a certain contaminant is, the influent flow rate, what the effluent concentration must be (as required by law), and can estimate what the removal/degradation rate of the compound should be. Then the engineer can predict the necessary detention time and thus the reactor volume.
Consider our equation:
In this expression, note that as we said above, everything but V is known, so the engineer can solve to determine how large the reactor volume should be.
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