1.7 - Mass Balance for Pollutant in the Lake
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Practice Questions
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Define what is meant by mass balance.
💡 Hint: Think about how we measure inputs and outputs in a system.
What are the two main components of mass balance?
💡 Hint: Consider the flow of materials.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the formula for mass balance?
💡 Hint: Think about what accumulates over time.
True or False: Evaporation can directly contribute to the input of pollutants into a lake.
💡 Hint: Consider where pollutants go.
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Challenge Problems
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A lake with a depth of 2 meters and a surface area of 5000 m^2 has an initial concentration of pollutant A of 1 kg/m^3. If a factory discharges 200 kg/day into the lake and evaporation removes 50 kg/day, calculate the concentration after three days.
💡 Hint: Consider the overall mass accounting across the time in your calculations.
If a pollutant is continuously added to a well-mixed lake, and after three days the concentration is observed to be 1.5 kg/m^3 with continuous inputs of 75 kg/day and evaporation of 25 kg/day, calculate the initial concentration prior to any discharge.
💡 Hint: You will need to set up the mass balance equation to find initial values.
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