Question

A leather processing plant uses harsh chemicals and generates metallic waste mixed in water that needs to be disposed off in a safe manner without causing environmental pollution. On a normal day, 5000 kg/hr of waste water (containing 10.0 wt% metallic waste) from the plant is sent to a treatment unit. The treatment unit is able to filter out 98.0 % of the metallic components along with 2.0% of water in the feed and recycle it back to the leather plant. The effluent is safely discharged into a local river. On one day of increased leather production, the plant discharges 7000 kg/hr of waste water which is beyond the maximum capacity of the treatment unit. The treatment team decides to discharge the excess liquid along with the regular effluent in the river. What is the new discharge rate in the river? If the Pollution Control Board has a set a maximum limit of 0.5 wt% on the mass fraction of the metallic waste discharged into the river, is the treatment team violating the law?

Answer 1

Answer:

plant discharges 7000 kg/hr of waste water which is beyond the maximum capacity of the treatment unit. The treatment team decides to discharge the excess liquid along with the regular effluent in the river. What is the new discharge rate in the river? If the Pollution Control Board has a set a maximum limit of 0.5 wt% on the mass fraction of the metallic waste discharged into the river, is the treatment team violating the law .

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