A bankrupt chemical firm has been taken over by new management. On the property, they found a 20,000 m3 brine (i.e., salt) pond containing 25,000 mg/L of salt. The new owners propose to flush the pond into their discharge pipe leading to the Pacific Ocean, which has a salt concentration of about 35,000 mg/L (or 3.5% salt). You have been hired by the company to calculate the flow rate (in m3/s) of freshwater (0 mg/L salt) that must they use to reduce the salt concentration in the pond to 500 mg/L within 3 months (90 days). To increase your billable hours, then calculate the total volume of water that was used (in m3) and the mass of salt (in kg) that was exported to the Pacific Ocean. You may assume the pond volume remains the same during the flushing process, the pond is completely mixed, and the salt is a conservative substance.
A bankrupt chemical firm has been taken over by new management. On the property, they found a 20,000 m3 brine (i.e., salt) pond containing 25,000 mg/L of salt. The new owners propose to flush the pond into their discharge pipe leading to the Pacific Ocean, which has a salt concentration of about 35,000 mg/L (or 3.5% salt). You have been hired by the company to calculate the flow rate (in m3/s) of freshwater (0 mg/L salt) that must they use to reduce the salt concentration in the pond to 500 mg/L within 3 months (90 days). To increase your billable hours, then calculate the total volume of water that was used (in m3) and the mass of salt (in kg) that was exported to the Pacific Ocean. You may assume the pond volume remains the same during the flushing process, the pond is completely mixed, and the salt is a conservative substance.
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