Question 3 A stream containing 5.15% wt% chromium, Cr, is contained in the wastewater from a metal finishing plant. The wastewater stream is fed to a treatment unit that removes 95% of the chromium in the feed and recycles it to the plant. The residual liquid stream leaving the treatment unit is sent to a waste lagoon. The treatment unit has a capacity of 4500 kg wastewater/hr. If wastewater leaves the finishing plant at a rate higher than the capacity of the treatment unit, the excess (anything above 4500 kg/hr) bypasses the unit and combines with the residual liquid leaving the unit, and the combined stream goes to the waste lagoon. If the wastewater leaves the finishing plant at rate of 6000 kg/hr, calculate the flow rate of liquid to the waste lagoon and the mass fraction of Cr in this liquid.

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Principal Quantities and EOS

A physical quantity represents the physical state of a system. It is expressed as the product of a number and unit. The basic quantities used in science are length, mass, and time. The principal quantities are the quantities that are independent of other quantities.