I do not know how to solve this problem.
A manufacture in Ontario has been fined because it has beenreleasing 5 L/s effluent having
zinc concentration of 0.1 mg/L into a river. Upstream of thefactory, the stream water rate is
100 L/s with zinc concentration of approximately zero. The factoryhas been forced to
reduce the zinc concentration of the effluent to below 20 ĂŽÂĽg/L. Theengineer that is an
employee of the factory recommends that they divert parts of thestream into the site and
dilute the effluent to bring its zinc concentration to the requiredlevel.
a) Calculate the present concentration of zinc several milesdownstream of the plant
where the zinc is diluted in stream completely.
b) Compute the amount of water needed to be diverted to the site toachieve the required
zinc concentration of effluent.
c) Determine the concentration of zinc downstream of the plantwhere the zinc is diluted
in stream completely if the engineer’s plan is put intooperation.
