Effluents from metal-finishing plants have the potential of discharging undesirable quantities of metals, such as cadmium, nickel, lead, manganese, and chromium, in forms that are detrimental to water and air quality. A local metal-finishing plant has identified a wastewater stream that contains 5.15 wt% chromium (Cr) and devised the following approach to lowering risk and recovering the valuable metal. 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 w aste lagoon. The treatment unit has a maximum capacity of4500 kg wastewater/h. If wastewater leaves the finishing plant at a rate higher than the capacity of the treatment unit, the excess (anything above 4500 kg/h) bypasses the unit and combines with the residual liquid leaving the unit, and the combined stream goes to the waste lagoon.
nijlkg Cr/h) [no water]95C< of Cr in feed Io unit | ||
Wastewater | ||
m|(kg/h)0.0515 kg Ci/kg | ms
|
|
mj
nifttkg/h) |
rajtkg/h)To waste lagoon
- Without assuming a basis of calculation, draw and label a flowchart of the process.
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