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Chromatewasteisconcentratedbyevaporationinaseriesofshallowflowthroughreactortanks connectedbyashortlengthofpipe.
Chromate waste is concentrated by evaporation in a series of shallow flow through reactor tanks connected by a short length of pipe. The first tank in the series has a volume of 4500 ft3 and a residence time (for water) of 2 hours. The second tank also has a volume of 4500 ft3. The evaporation rate is about 1/16 of the volume of each tank per hour. 50 moles/hour of chromate (CrO42‐), along with water, enters the first tank. Assume that CrO42‐ does not volatilize (i.e., it remains with the liquid water at all times) and is conservative. If both tanks are well‐mixed and remain at constant volume, what is the steady‐state concentration (in mg/L) of chromate (CrO42‐) in the effluent water leaving the second tank